Pressure relief assembly

Abstract

The pressure relief assembly has a frame having a connection structure, a valve mounting surface, a valve opening within the valve mounting surface, a vent mounting surface, and a vent opening within the vent mounting surface. The vent opening is functionally parallel to the valve opening. The valve body is disposed sealably on the valve mounting surface across the valve opening. The first check valve releasably fixes the valve body to the frame. The first check valve is configured to release the valve body from the frame when a minimum pressure difference occurs across the valve opening. A vent is connected to the vent mounting surface across the vent opening.

Description

Technical Field

[0001] [Related Applications] This application claims the benefit of U.S. Provisional Application No. 63 / 352,711, filed Jun. 16, 2022, and U.S. Provisional Application No. 63 / 341,725, filed May 13, 2022, the disclosures of which are hereby incorporated by reference in their entirety.

[0002] This disclosure generally relates to assemblies. More specifically, this disclosure relates to a pressure relief assembly.

Summary of the Invention

[0003] The technology disclosed herein relates, in part, to a pressure relief assembly having a frame with a coupling structure, a valve mounting surface, a valve opening within the valve mounting surface, a vent mounting surface, and a vent opening within the vent mounting surface. The vent opening is functionally parallel to the valve opening. A valve body is sealingly disposed on the valve mounting surface across the valve opening. A first check valve releasably secures the valve body to the frame, and the first check valve is configured to release the valve body from the valve frame based on a minimum pressure differential across the valve opening. A vent is coupled to the vent mounting surface across the vent opening.

[0004] In some such embodiments, the pressure relief assembly has a vent cover extending laterally across the vent, and the vent is axially positioned between the frame and the vent cover. Additionally or alternatively, the vent cover and the valve body are a single integral component. Additionally or alternatively, the pressure relief assembly has an environmental opening perpendicular to the vent cover. Additionally or alternatively, the environmental opening is axially positioned between the vent cover and the vent. Additionally or alternatively, the environmental opening is defined by the vent cover. Additionally or alternatively, the vent is a breathable membrane.

[0005] Additionally or alternatively, the second detent releasably secures the valve body to the frame. Additionally or alternatively, the second detent extends laterally from the frame to the valve body and is configured to release the valve body from the valve frame based on a minimum pressure differential across the valve opening. Additionally or alternatively, the second detent is a spring-type detent. Additionally or alternatively, the hinge pivotally couples the valve body to the frame.

[0006] Additionally or alternatively, the hinge is located laterally opposite the first detent with respect to the valve body. Additionally or alternatively, the first detent extends laterally from the frame to the valve body. Additionally or alternatively, the valve stem extends axially from the valve body and the first detent extends laterally from the frame to the valve stem. Additionally or alternatively, the first detent is a spring-type detent.

[0007] Additionally or alternatively, the first detent has a detent housing having a first end and an open second end. A compression spring is disposed within the detent housing and extends from the first end toward the open second end. A detent engagement surface is slidably disposed within the detent housing. The compression spring is compressibly disposed between the detent engagement surface and the first end of the detent housing.

[0008] Additionally or alternatively, the first detent is a magnet. Additionally or alternatively, the valve body has a laterally circular profile. Additionally or alternatively, the vent opening is geometrically parallel to the valve opening. Additionally or alternatively, the vent opening is geometrically non-parallel to the valve opening. Additionally or alternatively, a guard is coupled to the frame and defines a plurality of openings spaced laterally across the valve airflow passage and the vent airflow passage. Additionally or alternatively, the assembly has a guard coupled to the frame, the guard defining a plurality of openings spaced laterally across the valve airflow passage. Additionally or alternatively, the guard is located toward the first end of the valve assembly.

[0009] Some embodiments of the technology disclosed in this application relate to a pressure relief assembly having a first axial end, a second axial end, and a valve airflow passage extending through a valve opening from the first axial end to the second axial end. The frame has a connection structure, a valve mounting surface, and a valve opening within the valve mounting surface. The valve body is sealably disposed on the valve mounting surface across the valve opening, thereby blocking the valve airflow passage. A first spring-loaded detent releasably secures the valve body to the frame, and the first spring-loaded detent is configured to release the valve body from the valve frame at a minimum pressure differential across the valve opening. The valve body is configured to move away from the valve airflow passage at a minimum pressure differential across the valve opening.

[0010] In some such embodiments, the first spring-loaded detent extends laterally from the frame to the valve body. Additionally or alternatively, the valve stem extends axially from the valve body, and the first detent extends laterally from the frame to the valve stem. Additionally or alternatively, the pressure relief assembly has a plurality of spring-loaded detents including the first spring-loaded detent. Each of the plurality of spring-loaded detents releasably secures the valve body to the frame. Each of the plurality of spring-loaded detents extends laterally from the frame to the valve body. Each spring-loaded detent is configured to release the valve body with a minimum pressure differential across the valve opening. Additionally or alternatively, the pressure relief assembly has a vent, and the frame further has a vent mounting surface and a vent opening within the vent mounting surface. The vent opening is functionally parallel to the valve opening, and the vent is connected to the vent mounting surface across the vent opening. Additionally or alternatively, the pressure relief assembly has a vent, the valve body has a vent mounting surface and a vent opening within the vent mounting surface, and the vent opening is functionally parallel to the valve opening. The vent is connected to the vent mounting surface across the vent opening. Additionally or alternatively, the valve has a valve sidewall around the vent opening, the frame has a frame sidewall around the valve opening, and the frame sidewall is radially outwardly spaced from the valve sidewall.

[0011] Additionally or alternatively, the vent cover extends laterally across the vent. Additionally or alternatively, the vent is axially positioned between the frame and the vent cover. Additionally or alternatively, the vent cover and the valve body are a single integral component. Additionally or alternatively, the environmental opening is defined perpendicular to the vent cover. Additionally or alternatively, the environmental opening is axially positioned between the vent cover and the vent. Additionally or alternatively, the environmental opening is defined by the vent cover. Additionally or alternatively, the vent opening is geometrically parallel to the valve opening. Additionally or alternatively, the vent opening is geometrically non-parallel to the valve opening.

[0012] Additionally or alternatively, the vent is a breathable membrane. Additionally or alternatively, the hinge pivotally couples the valve body to the frame. Additionally or alternatively, the hinge is positioned laterally opposite the first detent with respect to the valve body. Additionally or alternatively, the first spring-loaded detent has a detent housing having a first end and a second end. A compression spring is disposed within the detent housing. The compression spring extends from the first end toward the second end. A detent engagement surface is slidably disposed within the detent housing. The compression spring is compressibly disposed between the detent engagement surface and the first end of the detent housing. Additionally or alternatively, the valve body has a laterally circular profile. Additionally or alternatively, the assembly has a guard coupled to the frame, the guard defining a plurality of openings spaced laterally across the valve air flow path. Additionally or alternatively, the guard is positioned toward the first end of the valve assembly.

[0013] Some embodiments of the technology disclosed in the present application relate to a pressure relief assembly having a frame with a connection structure, a valve mounting surface, and a valve opening within the valve mounting surface. The valve body is sealingly disposed on the valve mounting surface across the valve opening. The first spring-loaded detent releasably secures the valve body to the frame, and the first spring-loaded detent is configured to release the valve body from the valve frame with a minimum pressure differential across the valve opening. The first spring-loaded detent has a detent housing having a first end and a second end. A compression spring is disposed within the detent housing, and the compression spring extends from the first end toward the second end. A detent engagement surface is slidably disposed within the detent housing. The compression spring is compressibly disposed between the detent engagement surface and the first end of the detent housing.

[0014] In some such embodiments, the frame has a vent hole mounting surface and a vent opening within the vent mounting surface. The vent opening is functionally in parallel with the valve opening. The pressure relief assembly has a vent connected to the vent mounting surface across the vent opening. Additionally or alternatively, the pressure relief assembly has a vent, the valve body has a vent mounting surface and a vent opening within the vent mounting surface, and the vent opening is functionally in parallel with the valve opening. The vent is connected to the vent mounting surface across the vent opening.

[0015] Additionally or alternatively, the vent opening is geometrically parallel to the valve opening. Additionally or alternatively, the vent opening is geometrically non - parallel to the valve opening.

[0016] Additionally or alternatively, the vent cover extends laterally across the vent, and the vent is axially positioned between the frame and the vent cover. Additionally or alternatively, the vent cover and the valve body are a single integral component. Additionally or alternatively, the environmental opening is defined perpendicular to the vent cover. Additionally or alternatively, the environmental opening is axially positioned between the vent cover and the vent. Additionally or alternatively, the environmental opening is defined by the vent cover. Additionally or alternatively, the vent is a breathable membrane. Additionally or alternatively, the valve body has a laterally circular contour. Additionally or alternatively, the first spring - type detent extends laterally from the frame to the valve body. Additionally or alternatively, the valve stem extends axially from the valve body, and the first spring - type detent extends laterally from the frame to the valve stem.

[0017] Additionally or alternatively, the assembly has a second spring-loaded detent that releasably secures the valve body to the frame. Additionally or alternatively, the second spring-loaded detent extends laterally from the frame to the valve body. The second spring-loaded detent is configured to release the valve body from the valve frame upon the minimum pressure differential across the valve opening. Additionally or alternatively, the hinge pivotally couples the valve body to the frame. Additionally or alternatively, the hinge is positioned laterally opposite the first spring-loaded detent with respect to the valve body. Additionally or alternatively, the valve has a valve sidewall around the vent opening, the frame has a frame sidewall around the valve opening, and the frame sidewall is radially outwardly spaced from the valve sidewall. Additionally or alternatively, the assembly has a guard coupled to the frame, and the guard defines a plurality of openings that are laterally spaced across the valve airflow passageway. Additionally or alternatively, the guard is positioned toward the first end of the valve assembly.

[0018] The foregoing summary is not intended to describe each embodiment or every implementation. Rather, a more complete understanding of the exemplary embodiments will become apparent and understood by reference to the following detailed description of the exemplary embodiments and the claims in view of the accompanying drawings.

Brief Description of the Drawings

[0019] The present technology will be more fully understood and appreciated by considering the following detailed description of various embodiments in connection with the accompanying drawings.

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DETAILED DESCRIPTION OF THE INVENTION

[0020] The drawings are drawn mainly for clarity and, as a result, are not necessarily drawn to scale. Further, without limitation, various structures / components, including fasteners, electrical components (wiring, cables, etc.), etc., are shown schematically to better illustrate the aspects of the illustrated embodiments or are excluded from part or all of the figures when such structures / components are not necessary to understand the various exemplary embodiments described in the present application. However, the absence of illustration / explanation of such structures / components in a particular figure should not be construed as limiting the scope of the various embodiments.

[0021] A pressure relief assembly consistent with the technology disclosed in the present application is generally configured to relieve the pressure of an enclosure when the pressure within the enclosure exceeds a minimum pressure differential with respect to the environment outside the enclosure. The pressure relief assembly is generally configured to be connected to the enclosure, and the enclosure is generally not a component of the pressure relief assembly. The pressure relief assembly can be configured to facilitate selective pressure equalization of the enclosure while preventing the ingress of contaminants such as particles and liquids (e.g., water) into the enclosure. The enclosure is generally configured to house system components such as, for example, electronic components and battery cells. In some examples, the enclosure is a battery housing. Some embodiments of the technology disclosed in the present application may have the advantage that the pressure relief assembly can be reused after release of the pressure relief valve. In particular, the check valve that can be used to release the pressure relief valve can be configured to be deployed multiple times without mechanical / physical degradation. This allows for a predictable minimum pressure differential that triggers the deployment of the valve. The reusability of the pressure relief assembly can have the advantage, for example, of allowing performance testing of all components prior to use by the end customer. The reusability of the pressure relief assembly can have the advantage, as another example, of allowing reuse by the end customer.

[0022] ​

[0023] Figures 1-4 show one exemplary pressure relief assembly 100 that is consistent with the technology disclosed in the present application and can be viewed in conjunction with the following description. Figure 1 is a perspective view of an exemplary pressure relief assembly 100, Figure 2 is a first exploded view of an exemplary pressure relief assembly 100, Figure 3 is a second exploded view of an exemplary pressure relief assembly 100, and Figure 4 is a cross-sectional view of the exemplary pressure relief assembly 100 shown in Figure 1.

[0024] The pressure relief assembly 100 is generally configured to be coupled to an enclosure around an opening within the enclosure. The pressure relief assembly 100 generally has a first axial end 102, a second axial end 104, and a valve airflow passage 106 extending from the first axial end 102 to the second axial end 104. The valve airflow passage 106 is selectively blocked by a valve 130, which is configured to relieve pressure when the pressure within the enclosure exceeds a minimum pressure differential with respect to the environment outside the enclosure.

[0025] The pressure relief assembly 100 generally has a frame 110 and a valve 130 coupled to the frame 110. The frame 110 is generally configured to support one or more components of the pressure relief assembly 100. The frame 110 has a connection structure 120, a valve mounting surface 112, and a valve opening 111 within the valve mounting surface 112. The valve airflow passage 106 selectively penetrates the valve opening 111.

[0026] The connection structure 120 is generally configured to be sealably connected to the enclosure around an enclosure opening (not currently shown). The connection structure 120 is generally configured to engage with the enclosure. In the present example, the connection structure 120 has a plurality of fastener receptacles 122 configured to receive fasteners that secure the pressure relief assembly 100 to the enclosure. Examples of fasteners include screws, bolts, pins, etc. In some embodiments, the connection structure 120 is defined toward the second axial end 104 of the pressure relief assembly 100.

[0027] In some other embodiments, the connection structure can form a snap-fit connection with the enclosure. In some other embodiments, the connection structure forms a mating structure configured to mate with a corresponding structure formed by the casing. For example, the connection structure can form threads configured to be engaged by the enclosure around the enclosure opening. As another example, the connection structure can form a connector that interlocks with the enclosure around the enclosure opening, such as a bayonet connector. In some embodiments, the connection structure can be bonded to the enclosure around the enclosure opening using an adhesive.

[0028] In embodiments consistent with the present example, the pressure relief assembly 100 has a seal region 124 (best seen in FIG. 4). The seal region 124 is configured to form a seal between the pressure relief assembly 100 and the enclosure when the pressure relief assembly 100 is coupled to the enclosure. The seal region 124 generally surrounds a portion of the valve air flow passage. In the example presently illustrated, the seal region 124 surrounds the valve opening 111. In some embodiments, the seal region 124 surrounds the coupling structure 120. The seal region 124 can include an elastomeric material configured to contact the enclosure. The seal region 124 can be defined by the frame 110 itself or can be a separate component such as the seal 126. In the present example, the seal region 124 includes a circumferential groove 125 configured to receive the seal 126. In some embodiments, the seal region 124 has a seal 126 that is a loop of rubber or other gasket material or seal material.

[0029] The valve mounting surface 112 is generally configured to sealingly receive the valve 130 around the valve opening 111. The valve 130 selectively blocks the valve air flow passage 106. In the present example, the valve mounting surface 112 includes a seal component 114 configured to form a seal with the valve body 132 of the valve 130. In some other embodiments, the valve body 132 has a seal component 114 configured to form a seal with the valve mounting surface 112. The seal component 114 can be, for example, an O-ring or another loop of elastomeric material.

[0030] Valve 130 is generally configured to accommodate pressure relief from the enclosure to which the pressure relief assembly 100 is connected. Valve 130 is generally configured to accommodate pressure relief from the first axial end 102 to the second axial end 104 via the frame 110. Valve 130 has a valve body 132 that is sealably disposed on the valve mounting surface 112 across the valve opening 111. Thus, the valve air flow passage 106 is blocked by the valve body 132. The valve body 132 can be composed of various materials and combinations of materials including plastics, metals, woods, etc. The valve body 132 is generally airtight and liquid impermeable. The term airtight as used herein means that there is no measurable air flow across the valve body 132 at room temperature and the pressure difference across the valve body 132 is at least 20 millibars.

[0031] The valve body 132 can have various different shapes, but in the present embodiment, the valve body 132 has a circular profile in the lateral direction. The "lateral direction" is the direction of a plane perpendicular to the axial direction, and the axial direction is the direction of the axis x (FIG. 4) extending between the first axial end 102 and the second axial end 104. In some embodiments, the valve body 132 can have a polygonal lateral profile such as rectangular, hexagonal, etc.

[0032] The valve 130 also has at least a first detent 140 that releasably secures the valve body 132 to the frame 110. The first detent 140 is configured to release the valve body 132 from the frame 110 when a minimum pressure difference occurs across the valve opening 111. In the present example, the valve 130 has a plurality of detents 140 including a first detent that releasably secures the valve body 132 to the frame 110. In the present application, a detent is defined as a mechanical or magnetic structure that fixes a first part to a second part and releases the first part from the second part when a specific release force is applied to the first part. According to the technology disclosed in the present application, the "first part" is generally the valve body 132, and the release force generally applied to the valve body 132 is the pressure difference between the enclosure and the environment outside the enclosure.

[0033] The detents 140 can have various configurations. In the present example, each of the detents 140 is a spring-type detent. A spring-type detent is a detent that utilizes a compression spring to fix the valve 130 to the frame 110, and the spring force overcomes the release force to release the valve 130 from the frame 110. Each detent 140 extends laterally from the frame 110 to the valve body 132. In the present example, each detent 140 is fixed to the valve body 132, and each detent 140 engages the frame 110 by friction, but the reverse configuration is also possible, where each detent 140 is fixed to the frame 110 and engages the valve body 132 by friction. Additionally, other types of engagement such as magnetic engagement are also possible.

[0034] In various embodiments, each of the plurality of retainers 140 has the same structure. In the present example, best shown in FIG. 4, each retainer 140 has a retainer housing 142 having a first end 141 and a second end 143. The second end 143 is generally open, and a retainer engagement surface 144 projects from the second end 143 of the retainer housing 142 and frictionally engages a mating surface 145 of the frame 110 (or the opposite valve body 132). A compression spring 146 is disposed within the retainer housing 142 and extends from the first end 141 toward the second end 143. The compression spring 146 is compressed between the first end 141 of the retainer housing 142 and the retainer engagement surface 144. The compression spring 146 biases the retainer engagement surface 144 outwardly. The retainer engagement surface 144 is slidably disposed within the retainer housing 142. In some embodiments, the compression spring 146 can be a helical coil formed of metal or plastic. In some embodiments, the compression spring 146 can also be a plurality of coils.

[0035] When the pressure within the enclosure rises such that the pressure difference between the enclosure and the external environment is minimized, the force between the frame 110 and the retainer engagement surface 144 increases until it overcomes the biasing force of the compression spring 146, laterally translating the retainer engagement surface 144 toward the first end of the retainer housing 142 relative to the compression spring 146. The pressure difference between the enclosure and the external environment provides a force that pushes the valve body 132 out of the valve opening 111 and is not counteracted by the retainer 140.

[0036] There are various factors that help define the minimum pressure differential for removing the valve body 132 from the valve opening 111. All of the area of the lateral profile of the valve opening 111, the biasing force of the check valve 140, the number of check valves 140, the contact angle between the check valve engagement surface 144 and the frame 110, and the curvature of the check valve engagement surface 144 are examples of factors that contribute to defining the minimum pressure differential for removing the valve body 132 from the valve opening 111. The minimum pressure differential is not particularly limited, but in some embodiments, the minimum pressure differential ranges from 40 mbar (0.58 psi) to 100 mbar (1.45 psi), from 50 mbar (0.73 psi) to 90 mbar (1.3 psi), or from 60 mbar (0.87 psi) to 80 mbar (1.16 psi). In one specific example, the minimum pressure differential ranges from 65 mbar (0.94 psi) to 75 mbar (1.09 psi). However, other ranges are certainly conceivable.

[0037] The valve body 132 is generally configured to be clear of the valve airflow pathway 106 when a minimum pressure differential occurs across the valve opening 111. To be "clear of the valve airflow pathway" means that at least 85%, 90%, 95%, or 97% of the lateral region of the valve opening does not overlap the lateral region of the valve body 132 in the axial direction. In some embodiments, there is no overlap between the lateral region of the valve body 132 in the axial direction and 100% of the lateral region of the valve opening. Such a configuration can advantageously maximize the pressure relief from the enclosure to the external environment. In some such embodiments, the valve body 132 is configured to be pushed out from the frame 110 when a minimum pressure differential occurs across the valve opening 111. In some embodiments, the tether can connect the valve body 132 to the frame 110 such that the valve body 132 remains near the frame 110 even after being removed from the frame 110.

[0038] In the present example, the detent engagement surface 144 is defined by a detent ball 148 (FIG. 4) disposed within the detent housing 142. The detent ball 148 can be a sphere rotatably disposed within the detent housing 142 to facilitate release of the valve body 132 by the frame 110. In some other embodiments, the detent engagement surface can be defined by a component of a different shape, such as an oval or cylindrical component having a rounded convex end that forms the detent engagement surface 144. In some other embodiments, the detent engagement surface is concave.

[0039] As will be appreciated, the detent 140 can have alternative configurations. In some embodiments, the detent is not a spring-type detent. For example, the detent can be a protrusion extending laterally outward from the valve body 132 or laterally inward from the frame 110 to engage a corresponding engagement surface on the other of the frame 110 or the valve body 132. In some embodiments, each detent is a magnet that secures the valve body 132 to the frame 110.

[0040] In the present example, the detent 140 is fixed to the valve body 132. More particularly, the valve body 132 defines a lateral detent opening 134 (shown in FIG. 3). In this example, the detent openings 134 extend radially outward from the central axis x and are equally spaced about the central axis. Each detent opening 134 is configured to receive and engage a detent housing 142. Specifically, a first end 141 of each detent housing 142 is inserted within the detent opening 134. A second end 143 of the detent housing 142 can be located outside the detent opening 134 or within the detent opening 134. The detent engagement surface 144 is generally located outside of the detent opening 134.

[0041] In some other embodiments, the valve 130 can have a valve stem that extends axially outward from the valve body 132. In such an example, the detent can extend laterally from the frame to the valve stem to releasably secure the valve body 132 to the valve mounting surface 112. Such an example will be described later with reference to FIGS. 11-14.

[0042] In some embodiments of the technology disclosed in the present application, there may be an advantage of enabling the reuse of the pressure relief assembly 100 after releasing the valve body 132 from the frame 110. Specifically, for example, a detent 140 such as a spring-type detent or a magnet can be configured to be deployed multiple times without mechanical / physical degradation, thereby enabling a predictable minimum pressure difference that triggers the deployment of the valve body 132. The reusability of the pressure relief assembly 100 can have the advantage of, for example, enabling performance testing of all components prior to use by the end customer. The reusability of the pressure relief assembly 100 can have the advantage of, as another example, enabling reuse by the end customer.

[0043] In some examples of the technology disclosed in this application, including what is illustrated, the pressure relief assembly 100 has a vent 150. The term "vent" is used to refer to a component made of a breathable material configured to promote passive airflow. In some such embodiments, the vent 150 allows ventilation of the enclosure during normal operating conditions. In embodiments where the vent 150 is incorporated into the pressure relief assembly 100, the frame 110 defines a vent mounting surface 116 and a vent opening 115 within the vent mounting surface 116 (particularly seen in FIG. 3). The vent opening 115 is functionally parallel to the valve opening 111. This means that the vent opening 115 and the valve opening 111 are arranged parallel to the airflow through the pressure relief assembly 100. In some embodiments, the vent opening 115 can be geometrically parallel to the valve opening 111. In some other embodiments, the vent opening 115 is geometrically non-parallel to the valve opening 111, for example, the vent opening 115 forms a predetermined angle with the valve opening 111, which will be described in more detail below.

[0044] The vent 150 is connected to the vent mounting surface 116 across the vent opening 115. The vent 150 is generally configured to prevent external contaminants from entering through the vent opening 115 from the second axial end 104 to the first axial end 102. The vent 150 is functionally parallel to the valve 130 with respect to the airflow through the pressure relief assembly 100. In various embodiments, the pressure relief assembly 100 does not have a vent parallel to the valve 130, whether functionally parallel or geometrically parallel. In some embodiments, the vent 150 is arranged in series with the inlet relief valve with respect to the airflow through the pressure relief assembly 100, which will be described in more detail below.

[0045] Vent 150 is generally positioned in fluid communication with the enclosure. Vent 150 is configured such that gas flowing through vent 150 enables that gas to pass between the enclosure and the environment external to the enclosure. In some embodiments, vent 150 is configured to prevent particles from entering the enclosure. In some embodiments, vent 150 is configured to prevent liquid from entering the enclosure.

[0046] Vent 150 can be made of a variety of different materials and combinations of materials. In some embodiments, vent 150 is a passive airflow vent. This means that vent 150 is configured to passively allow airflow through it. In various embodiments, a breathable membrane is incorporated into vent 150. Breathable membranes include, for example, polyethersulfone (PES), nylon, cellulose acetate, polyvinylidene difluoride (PVDF), polyamide, polycarbonate, and acrylic. In various embodiments, the breathable membrane is made of porous polytetrafluoroethylene (PTFE). Porous PTFE can be manufactured by various approaches and combinations of approaches generally known in the art. Vent 150 can be a laminate or composite including a breathable membrane such as a PTFE membrane laminated to a woven or non-woven support layer. In some embodiments, vent 150 is a woven or non-woven fabric. Vent 150 can be made of a hydrophobic material or vent 150 can be treated to exhibit hydrophobic properties. In one example, vent 150 is a hydrophobic woven or non-woven fabric. Vent 150 can be made of an oleophobic material or vent 150 can be treated to exhibit oleophobic properties. In one example, vent 150 is an oleophobic woven or non-woven fabric. In some embodiments, vent 150 has a support ring that supports the perimeter of the breathable material. In some examples, vent 150 can be connected to frame 110 using an adhesive or via a weld area.

[0047] The pressure relief assembly 100 has a vent cover 152 that extends laterally across the vent 150 such that the vent 150 is axially positioned between the frame 110 and the vent cover 152. The vent cover 152 is generally axially spaced from the vent 150. In some embodiments, the vent cover 152 can be a separate component fixed to the frame 110. In some other embodiments, the vent cover 152 is a single component integral with the frame 110. The vent cover 152 has the advantage of being able to protect the vent 150 from the direct effects of environmental contaminants such as liquid sprays and debris. As best shown in FIGS. 1 and 2, an environmental opening 154 is defined between the vent cover 152 and the vent 150 and is configured to define a vent airflow passage between the vent 150 and the external environment. The environmental opening 154 can be perpendicular to the vent 150. The environmental opening 154 can be axially positioned between the vent cover 152 and the vent 150. Such a configuration is advantageous because it can limit the direct impact of environmental contaminants on the vent 150. Note that in the present example, the vent cover 152 and the valve body 132 are separate components, but in some embodiments, the vent cover 152 and the valve body 132 can be a single integral component. In some embodiments, the assembly 100 is configured to be installed in an operating environment such that, for example, the vent 150 is relatively protected from impacts by environmental contaminants such as water sprays and debris.

[0048] In some embodiments, vent 150 can be arranged in series with a second valve that is oriented opposite to valve 130 (which may be referred to as the first valve) described in detail above. In various embodiments, the first valve is an outlet relief valve. The second valve can be an inlet relief valve. Such an example is shown in FIG. 5, which is a cross-sectional view of an exemplary pressure relief assembly 200 that generally corresponds to the pressure relief assemblies of FIGS. 1-4 and except for the matters described in this application. Vent 250 can be located between inlet relief valve 260 and environmental opening 254. In some examples, the pressure relief assembly does not have a vent in series with the outlet relief valve.

[0049] Inlet relief valve 260 is generally configured to correspond to pressure relief from the second axial end 202 to the first axial end 204 through pressure relief assembly 200. Inlet relief valve 260 is generally configured to correspond to pressure relief from the external environment to the enclosure to which pressure relief assembly 200 is connected.

[0050] Vent 250 is generally configured to prevent the entry of external contaminants from the second axial end 204 to the first axial end 202 through inlet relief valve 260, especially when inlet relief valve 260 is not sealed from frame 210. Vent 250 is functionally parallel to outlet relief valve 230 with respect to the airflow through pressure relief assembly 200. Vent 250 is arranged in series with inlet relief valve 260 with respect to the airflow through pressure relief assembly 200. Vent 250 generally conforms to the description of vents elsewhere in this application. In various embodiments, pressure relief assembly 200 does not have a vent in series with outlet relief valve 230.

[0051] Figures 6 and 7 illustrate another example of a pressure relief assembly 300 that is consistent with the technology disclosed in the present application. FIG. 6 is an exploded perspective view of the pressure relief assembly 300, and FIG. 7 is a cross-sectional view. These figures also show an exemplary enclosure 10 configured such that the pressure relief assembly 300 is coupled thereto. Similar to the example described above, the pressure relief assembly 300 is generally configured to be coupled to the enclosure 10 about the enclosure opening 12. The pressure relief assembly 300 generally has a first axial end 302, a second axial end 304, and a valve airflow passage 306 extending from the first axial end 302 to the second axial end 304. The valve airflow passage 306 is selectively blocked by a valve 330 that is configured to relieve pressure when the pressure within the enclosure relative to the external environment exceeds a minimum pressure differential.

[0052] The pressure relief assembly 300 has a frame 310 to which the valve 330 is coupled. The frame 310 is generally configured to support one or more components of the pressure relief assembly 300. The frame 310 has a coupling structure 320, a valve mounting surface 312, and a valve opening 311 within the valve mounting surface 312. The valve airflow passage 306 selectively extends through the valve opening 311. In the present example, the frame 310 also defines a vent mounting surface 316 and a vent opening 315 within the vent mounting surface 316. The vent opening 315 is functionally parallel to the valve opening 311. Here, the vent opening 315 is geometrically parallel to the valve opening 311. Other configurations are possible and will be further described in the present application.

[0053] The vent 350 is coupled to the vent mounting surface 316 across the vent opening 315. The vent 350 is functionally parallel to the valve 330 with respect to the airflow through the pressure relief assembly 300. However, in some embodiments, the pressure relief assembly 300 does not have a vent. In some embodiments, the vent 350 is arranged in series with the inlet relief valve with respect to the airflow through the pressure relief assembly 300 described above with reference to FIG. 5.

[0054] The vent 350 is positioned in fluid communication with the interior of the enclosure 10. The vent 350 is configured such that gas flowing through the vent 350 enables the gas to pass between the interior of the enclosure 10 and the external environment of the enclosure 10. The vent 350 may be consistent with the previous description of the vent in this application. The pressure relief assembly 300 has a vent cover 352, and the vent cover 352 extends laterally across the vent 350 such that the vent 350 is axially positioned between the frame 310 and the vent cover 352. The vent cover 352 is generally axially spaced apart from the vent 350. The vent cover 352 may be consistent with the vent cover described above. An environmental opening 354 is defined between the vent cover 352 and the vent 350 and is configured to define a vent airflow passage between the vent 350 and the external environment. The environmental opening 354 may be perpendicular to the vent 350. The environmental opening 354 may be axially positioned between the vent cover 352 and the vent 350.

[0055] The connection structure 320 is generally configured to be sealably connected to the enclosure around the enclosure opening. The connection structure 320 is generally configured to engage the enclosure. In the present example, the connection structure 320 has a plurality of fastener receptacles 322 each configured to receive a fastener that secures the pressure relief assembly 300 to the enclosure. In some embodiments, the connection structure 320 is defined toward the first axial end 302 of the pressure relief assembly 300. The connection structure 320 may include a seal region 324 configured to accommodate a seal such as a seal loop 326 between the pressure relief assembly 300 and the enclosure when the pressure relief assembly 300 is connected to the enclosure. The seal region 324 can surround the valve opening 311 as in the presently shown example. The seal region 324 surrounds the valve air flow passage 306. In the present example, the seal region 324 surrounds the valve opening 311 and the vent opening 315. The connection structure 320 including the seal region 324 can have the configurations and alternative configurations described above.

[0056] The valve mounting surface 312 is generally configured to sealingly receive the valve 330 around the valve opening 311. The valve 330 selectively blocks the valve air flow passage 306. In the present example, the valve mounting surface 312 includes a sealing component 314 (FIG. 7) configured to form a seal with the valve 330. In some other embodiments, the valve 330 itself may include a sealing component 314 configured to form a seal with the valve mounting surface 312.

[0057] Valve 330 is generally configured to correspond to releasing the pressure from enclosure 10. Valve 330 is generally configured to correspond to releasing the pressure from the first axial end 302 to the second axial end 304 via frame 310. Valve 330 has a valve body 332, and the valve body 332 is sealably arranged on the valve mounting surface 312 across the valve opening 311 such that the valve air flow passage 306 is blocked by the valve body 332. The valve body 332 may coincide with the valve body described in detail above. However, in the current example, the valve body 332 has a different lateral contour shape from that of the examples in FIGS. 1-4. The valve body 332 in FIGS. 1-4 has a circular contour shape, but here the valve body 332 has a polygonal lateral contour shape.

[0058] In this example, valve 330 has a first detent 340 that releasably fixes the valve body 332 to the frame 310. The first detent 340 is configured to release the valve body 332 from the frame 310 when the minimum pressure difference occurs across the valve opening 311. In the current example, valve 330 has a single detent 340. The detent 340 is fixed to the first side end of the valve body 332. The engaging surface of the detent 340 frictionally engages with the frame, but a reverse configuration where the detent 340 is fixed to the frame and frictionally engages with the valve body 332 is also possible. Further, the frame or the valve body 332 may be engaged by other forces such as magnetic force. In the current example, the detent 340 is a spring-type detent, but the detent 340 may have another configuration described above. Further, in some embodiments, the pressure relief assembly can include an additional detent 340 that releasably connects the valve body 332 to the frame.

[0059] In the present example, the pressure relief assembly has a hinge 370 that pivotally couples the valve body 332 to the frame. The hinge 370 generally defines the movement path of the valve body 332. The hinge 370 is generally configured to accommodate pivotal movement of the valve body 332 when pressure, such as the force resulting from a minimized pressure differential across the valve body 332, is applied to the surface of the valve body 332 where the detent 340 is deployed and in communication with the enclosure. The valve body 332 is generally pivotable outwardly relative to the enclosure.

[0060] In the present example, the hinge 370 is positioned laterally opposite the first detent 340 with respect to the valve body 332. The hinge 370 is located at the second side end of the valve body 332, which is opposite the first side end of the valve body 332. In the present example, the hinge 370 is mutually defined by the mutual structure of the frame 310 and the valve body 332, but in other embodiments, the hinge 370 can be a separate component that pivotally couples the valve body 332 and the frame 310.

[0061] When the pressure within the enclosure rapidly rises beyond the minimum pressure differential between the enclosure and the external environment, the pressure within the enclosure pushes on the enclosure side of the valve body 332 and (as in the case described above) deploys the detent 340 to release the first side end of the valve body 332 from the frame 310. Next, the valve body 332 pivots away from the enclosure in response to the pressure to open the valve airflow passage 306 and equalize the pressure between the enclosure and the external environment.

[0062] In some embodiments, the valve body 332 is generally configured such that when the minimum pressure difference occurs across the valve opening 311, the valve airflow passage 306 is allowed to pass through. Such a configuration has the advantage of maximizing the release of pressure from the enclosure to the external environment. However, in the present example, the valve body 332 is configured to remain connected to the frame 310 via the hinge 370 even when the minimum pressure difference occurs across the valve opening 311.

[0063] FIG. 8 is a schematic cross-sectional view of yet another pressure relief assembly 400 that is consistent with the technology disclosed in the present application. Similar to the example described above, the pressure relief assembly 400 is generally configured to be connected to the enclosure around an opening in the enclosure. The pressure relief assembly 400 generally has a first axial end 402, a second axial end 404, and a valve airflow passage 406 extending from the first axial end 402 to the second axial end 404. The valve airflow passage 406 is selectively blocked by a valve 430, and the valve 430 is configured to release pressure when the pressure difference between the interior of the enclosure and the external environment exceeds a minimum pressure difference.

[0064] The pressure relief assembly 400 has a frame 410 and a valve 430 coupled to the frame 410. The frame 410 generally corresponds to the frame described above. The frame 410 has a connection structure 420, a valve mounting surface 412, and a valve opening 411 within the valve mounting surface 412. The valve air flow passage 406 selectively extends through the valve opening 411. In the present example, the frame 410 also defines a vent mounting surface 416 and a vent opening 415 within the vent mounting surface 416. The vent opening 415 is functionally parallel to the valve opening 411. Here, the vent opening 415 is geometrically non-parallel to the valve opening 411. In particular, in this example, the vent opening 415 is perpendicular to the valve opening 411, but the vent opening 415 can form various different angles with the valve opening 411. In the present example, the frame 410 defines a plurality of vent openings 415, and each vent opening 415 defines a vent mounting surface 416 around the vent opening 415. However, in some embodiments, the frame defines a single vent opening 415. In some embodiments, the vent openings 415 are spaced apart around an axis x that extends axially. In some embodiments, the axis x can be the central axis of the frame.

[0065] More specifically, in the present example, the frame 410 has a valve side wall 418 that extends axially between a first axial end 402 and a second axial end 404. The valve side wall 418 extends axially between the connection structure 420 and the valve 430, and more specifically, from the connection structure 420 to the valve mounting surface 412. The valve side wall 418 surrounds the valve air flow passage 406. The valve side wall 418 defines one or more vent openings 415. The valve side wall 418 is perpendicular to the valve opening 411, but in some embodiments, the valve side wall 418 can form a different angle with the valve opening 411.

[0066] The vent 450 is connected to each vent mounting surface 416 across each vent opening 415. The vent 450 is functionally parallel to the valve 430 with respect to the airflow passing through the pressure relief assembly 400. However, in some embodiments, the pressure relief assembly 400 does not have a vent. In some embodiments, the vent 450 is arranged in series with the inlet relief valve with respect to the airflow passing through the pressure relief assembly 400 described above with reference to FIG. 5.

[0067] The vent 450 may be consistent with the previous description of the vent in this application. In the current example, the vent does not have a vent cover extending across each of the vents 450, but in some other embodiments, the vent cover extends across each of the vents 450. In embodiments where a vent cover is incorporated, an environmental opening configured to define a vent airflow passage between the vent and the external environment can be defined between the vent cover and the vent 450. The environmental opening can be perpendicular to the vent 450. The environmental opening can be axially positioned between the vent cover and the vent 450.

[0068] The connection structure 420 is generally configured to be sealably connected to the enclosure around the enclosure opening. The connection structure 420 is generally configured to engage with the enclosure. In the current example, the connection structure 420 includes a threaded portion extending axially from a frame configured to rotatably engage with the mating inner peripheral surface of the enclosure around the enclosure opening. In this example, the connection structure 420 is defined toward the first axial end 402 of the pressure relief assembly 400. The connection structure 420 includes a seal region 424 configured to accommodate a seal loop 426 between the pressure relief assembly 400 and the enclosure when the pressure relief assembly 400 is connected to the enclosure. The seal region 424 generally surrounds the valve airflow passage 406. In the current example, the seal region 424 surrounds the threaded extension. The connection structure 420 including the seal region 424 can have the alternative configurations described above.

[0069] The valve mounting surface 412 is generally configured to sealably receive the valve 430 around the valve opening 411. In the present example, the valve mounting surface 412 is an inner peripheral surface surrounding the valve air flow passage 406. In some embodiments, the valve mounting surface 412 is an inner peripheral surface. The valve 430 selectively blocks the valve air flow passage 406 across the valve opening 411. In the present example, the valve mounting surface 412 and the valve body 432 form a seal around the valve opening 411.

[0070] The valve 430 is generally configured to correspond to releasing pressure from the enclosure. The valve 430 is generally configured to correspond to releasing pressure from the first axial end 402 to the second axial end 404 via the frame 410. The valve body 432 is sealably disposed on the valve mounting surface 412 across the valve opening 411 such that the valve air flow passage 406 is blocked by the valve body 432. The valve body 432 may coincide with the valve body described in detail above.

[0071] In the present example, the valve 430 has a plurality of detents 440 that releasably fix the valve body 432 to the frame 410. The detents are configured to release the valve body 432 from the frame 410 when the pressure difference across the valve opening 411 is minimized. The detents 440 are disposed around an outer periphery such as an outer peripheral surface of the valve body 432. In the present example, each of the detents 440 is a magnetic component configured to magnetically engage with the magnetic mating surface of the valve mounting surface 412. The engaging surface of each detent 440 magnetically engages with the frame. Alternative types of detents can also be used.

[0072] In some examples, although not currently visible, the hinge can pivotally couple the valve body 432 to the frame. In such examples, the hinge can define the movement path of the valve body 432. The hinge is generally configured to be subjected to a pressure such as a force resulting from a minimum pressure difference across the valve body 432 on the surface of the valve body 432 communicating with the enclosure, and when the detent is deployed, to correspond to the pivoting of the valve body 432. The valve body 432 is generally pivotable outwardly relative to the enclosure. In embodiments incorporating a hinge, the hinge can be located laterally on the opposite side of one or more detents 440 relative to the valve body 432.

[0073] When the pressure inside the enclosure rapidly rises beyond the minimum pressure difference between the inside of the enclosure and the external environment, the pressure inside the enclosure pushes the enclosure side of the valve body 432 and (as in the above case) deploys the detent 440 to separate the valve body 332 from the valve mounting surface 432. The valve body 432 is released from the frame or, in embodiments incorporating a hinge, pivots away from the enclosure in response to the pressure to allow the valve air flow passage 406 to pass through, equalizing the pressure between the inside of the enclosure and the external environment.

[0074] In some embodiments, the valve body 432 is generally configured such that the valve air flow passage 406 passes through when there is a minimum pressure difference across the valve opening 411. Such a configuration has the advantage of maximizing the release of pressure from the enclosure to the external environment. However, in the current example, the valve body 432 is configured to remain coupled to the frame 410 via the hinge even when there is a minimum pressure difference across the valve opening 411.

[0075] FIG. 9 shows an exploded view of yet another example of a pressure relief assembly 500 that conforms to the technology disclosed in the present application, and FIG. 10 is a cross-sectional view that conforms to such a pressure relief assembly 500. Similar to the examples described above, the pressure relief assembly 500 is generally configured to be connected to the enclosure around the enclosure opening. The pressure relief assembly 500 generally has a first axial end 502, a second axial end 504, and a valve air flow passage 506 extending from the first axial end 502 to the second axial end 504. The valve air flow passage 506 is selectively blocked by a valve 530, and the valve 530 is configured to relieve pressure when the pressure inside the enclosure with respect to the external environment exceeds a minimum pressure difference.

[0076] The pressure relief assembly 500 has a frame 510, and the valve 530 is connected to the frame 510. The frame 510 is generally configured to support one or more components of the pressure relief assembly 500. The frame 510 has a connection structure 520, a valve mounting surface 512, and a valve opening 511 within the valve mounting surface 512. The valve air flow passage 506 selectively extends through the valve opening 511. In the present example, the frame 510 also defines a vent mounting surface 516 and a vent opening 515 within the vent mounting surface 516. The vent opening 515 is functionally parallel to the valve opening 511. Here, the vent opening 515 is also geometrically parallel to the valve opening 511. The frame has a barrier wall 517 that separates the valve opening 511 from the vent opening 515. Other configurations as described above are also possible.

[0077] The vent 550 is connected to the vent mounting surface 516 across the vent opening 515. The vent 550 is functionally parallel to the valve 530 with respect to the air flow through the pressure relief assembly 500. However, in some embodiments, the pressure relief assembly 500 does not have a vent. In some embodiments, the vent 550 is arranged in series with an inlet relief valve with respect to the air flow through the pressure relief assembly 500 described above with reference to FIG. 5.

[0078] The vent 550 is configured to define a part of the vent airflow passage 556. The vent 550 is configured such that gas can pass through the vent 550 between the first axial end 502 and the second axial end 504. The vent 550 may be consistent with the description of the vent previously made in this application. The pressure relief assembly 500 has a vent cover 552, and the vent cover 552 extends laterally across the vent 550 such that the vent 550 is positioned axially between the frame 510 and the vent cover 552. The vent cover 552 is generally axially spaced from the vent 550.

[0079] The environmental opening 554 is defined by a vent cover 552 configured to define a part of the vent airflow passage 556 from the vent 550 to the external environment. In some examples, the environmental opening 554 is non - perpendicular to the vent 550, such as parallel to the vent. In this embodiment, the environmental opening 554 is perpendicular to the vent. In particular, the vent cover 552 has a "shadow box configuration" best shown in FIG. 10, and the laterally extending insertion segment 553 axially overlaps with the corresponding laterally extending outer wall opening 555 to form a tortuous flow path through the vent cover 552. In this embodiment, the laterally extending insertion segment 553 is axially spaced from the laterally extending outer segment 557. The environmental opening 554 is disposed between the insertion segment 553 and the outer segment 557.

[0080] The connection structure 520 is generally configured to be sealably connected to the enclosure around the enclosure opening. The connection structure 520 is generally configured to engage with the enclosure. In the present example, the connection structure 520 has a bayonet connector 522 configured to be received by a mating bayonet connector defined by the enclosure. In this example, the connection structure 520 is defined toward the first axial end 502 of the pressure relief assembly 500. The connection structure 520 may include a seal region 524 configured to accommodate a seal such as a seal loop 526 between the pressure relief assembly 500 and the enclosure when the pressure relief assembly 500 is connected to the enclosure. The seal region 524 can surround the valve opening 511 as in the presently shown example. The seal region 524 surrounds the valve air flow passage 506. In the present example, the seal region 524 surrounds the valve opening 511 and the vent opening 515. The connection structure 520 including the seal region 524 can have the configurations described above and alternative configurations.

[0081] The valve mounting surface 512 is generally configured to sealably receive the valve 530 around the valve opening 511. The valve 530 selectively blocks the valve air flow passage 506. In the present example, the valve mounting surface 512 includes a seal component 514 configured to form a seal with the valve 530. In some other embodiments, the valve 530 itself may include a seal component configured to form a seal with the valve mounting surface 512.

[0082] In the present example, the pressure relief assembly 500 has a seal ring 590 that is coupled to the frame 510. Note that the term "ring" does not necessarily mean a component having a circular shape, although the seal ring can indeed have a circular shape. Rather, the term "ring" is used in the present application to refer to a structure having a central opening and a material that completely surrounds the central opening. The seal ring 590 has a first axial end that is the seal loop 526 and a second axial end that forms a peripheral seal surface around the valve opening 511 and the valve opening. A portion of the peripheral seal surface defines a portion of the seal component 514 between the valve 530 and the frame 110. In some embodiments, the frame 510 can be externally coated on the seal ring 590. In some embodiments, the seal ring 590 can have a series of individual axial extensions 592 that connect the first axial end 502 and the second axial end 504. The individual axial extensions 592 can be arranged radially spaced around the central axis. More specifically, the individual axial extensions 592 can be arranged radially spaced around the valve opening 511 and the vent opening 515.

[0083] In the present example, a barrier seal 518 extends along a barrier wall 517 between the vent opening 515 and the valve opening 511 to form another portion of the seal component 514 between the valve 530 and the frame 110. In some other embodiments, a plurality of individual components can define various seal regions between the pressure relief assembly 500 and the enclosure and between the frame 110 and the valve 530 around the valve opening 511.

[0084] Valve 530 is generally configured to accommodate pressure relief from the enclosure. Valve 530 is generally configured to accommodate pressure relief from the first axial end 502 to the second axial end 504 via the frame 510. Valve 530 has a valve body 532, and the valve body 532 is sealably disposed on the valve mounting surface 512 across the valve opening 511 such that the valve air flow passage 506 is blocked by the valve body 532. The valve body 532 may correspond to the valve body described in detail above. However, in the present example, the valve body 532 has a different lateral contour shape from that of the examples of FIGS. 1-4. In the present example, the valve body 532 and the vent cover 552 are formed by a single integral component referred to herein as the "cap" 580. The cap 580 is both the valve body 532 and the vent cover 552. In the present example, the cap 580 forms a seal with the frame around the valve opening 511. In particular, the cap 580 and the frame 110 form a seal via a seal component 514 around the valve opening 511.

[0085] In this example, the valve 530 has a first detent 540 that releasably secures the valve body 532 to the frame 510. The first detent 540 is configured to release the valve body 532 from the frame 510 when the pressure difference across the valve opening 511 is minimized. In the present example, the valve 530 has a single detent 540. The detent 540 is secured to a cap 580 that is also the valve body 532. The engagement surface of the detent 540 frictionally engages the mating surface 545 of the frame 510, although the reverse configuration where the detent 540 is secured to the frame and frictionally engages the cap 580 and / or the valve body 532 is also possible. Further, additional or different forces such as magnetic forces can be used for the detent to engage the frame 510 and the valve body 532. In the present example, the detent 540 is a spring-loaded detent, although the detent 540 can have the alternative configurations described above. Further, in some embodiments, the pressure relief assembly can include additional detents 540 that releasably couple the valve body 532 to the frame.

[0086] In the present example, the pressure relief assembly has hinges 570a, 570b that pivotally couple the valve body 532 to the frame 510. The hinges 570a, 570b generally define the movement path of the valve body 532. The hinges 570a, 570b are generally configured to pivot the cap 580, particularly the valve body 532, in response to pressure such as that resulting from a minimized pressure difference across the valve body 532 being applied to the surface of the valve body 532 that communicates with the enclosure (thereby effecting the deployment of the detent 540). The cap 580 is generally pivotable outwardly relative to the enclosure.

[0087] In the present example, the hinges 570a, 570b are located laterally with respect to the valve body 532 on the side opposite to the first check valve 540. Since the hinges 570a, 570b are located at the second side ends 584 of the cap 580, the valve body 532 is located on the side opposite to the first side end 582 of the cap 580. In the present example, the hinges 570a, 570b are mutually defined by the mutual structure of the frame 510 and the cap 580. In some embodiments, the hinges 570a, 570b can be separate components that pivotally connect the cap 580 and the frame 510.

[0088] (When the pressure inside the enclosure (to which the pressure relief assembly 500 is connected) rapidly rises beyond the minimum pressure difference between the inside of the enclosure and the external environment, the pressure inside the enclosure presses on the enclosure side of the cap 580 / valve body 532, whereby the check valve 540 (as described above) is deployed to separate the first side end 582 of the valve body 532 and the frame 510. Next, the valve body 532 pivots away from the enclosure in response to the pressure to allow the valve airflow passage 506 to pass through, enabling equalization of the pressure between the inside of the enclosure and the external environment.

[0089] In some embodiments, the valve body 532 is generally configured to pass through the valve airflow passage 506 when a minimum pressure difference occurs across the valve opening 511. Such a configuration can have the advantage of maximizing pressure relief from the enclosure to the external environment. However, in the present example, the valve body 532 is configured to remain connected to the frame 510 via the hinges 570a, 570b when a minimum pressure difference occurs across the valve opening 511.

[0090] Figures 11 and 12 show another example of a pressure relief assembly 600 that is consistent with the technology disclosed in the present application. FIG. 11 is a cross-sectional view of the pressure relief assembly 600, and FIG. 12 is an exploded perspective cross-sectional view of the pressure relief assembly 600. These drawings also show an exemplary enclosure 10 configured to have the pressure relief assembly 600 connected thereto. Similar to the example described above, the pressure relief assembly 600 is generally configured to be connected to the enclosure 10 around the enclosure opening 12. The pressure relief assembly 600 generally has a first axial end 602, a second axial end 604, and a valve air flow path 606 extending from the first axial end 602 to the second axial end 604. The valve air flow path 606 is selectively blocked by a valve 630, and the valve 630 is configured to relieve pressure when the pressure inside the enclosure relative to the external environment exceeds a minimum pressure difference.

[0091] The pressure relief assembly 600 has a frame 610, and the valve 630 is connected to the frame 610. The frame 610 is generally configured to support one or more components of the pressure relief assembly 600. The frame 610 has a connection structure 620, a valve mounting surface 612, and a valve opening 611 (FIG. 12) within the valve mounting surface 612. The valve air flow path 606 selectively extends through the valve opening 611. Different from some of the embodiments described above, here, the frame 610 does not specifically define a vent mounting surface and a vent opening within the vent mounting surface. However, in some other embodiments, the frame can define a vent mounting surface and a vent opening within the vent mounting surface.

[0092] The connection structure 620 is generally configured to be sealably connected to the enclosure 10 around the enclosure opening 12. The connection structure 620 is generally configured to engage the enclosure 10. The connection structure 620 is defined toward the second axial end 604 of the pressure relief assembly 600. In the present example, the connection structure 620 is configured to form a compression fit with the enclosure 10 around the enclosure opening 12. The connection structure 620 may include a seal region 624 configured to accommodate a seal such as a seal loop 626 between the pressure relief assembly 600 and the enclosure 10 when the pressure relief assembly 600 is connected to the enclosure 10. The seal region 624 can surround the valve opening 611. The seal region 624 surrounds the valve airflow passage 606. In the present example, the seal region 624 surrounds the valve opening 611.

[0093] In the present example, the connection structure 620 includes an inner retaining rim 627 and an outer retaining rim 628 each extending radially outward from the frame 610. The inner retaining rim 627 is configured to be located within the enclosure 10. The outer retaining rim 628 is configured to be located outside the enclosure 10. The inner retaining rim 627 and the outer retaining rim 628 form an axially extending peripheral gap 629 configured to receive the wall of the enclosure 10 around the enclosure opening 12. The peripheral gap 629 is configured to compressibly receive the wall of the enclosure 10 and the seal loop 626. In the present example, the outer retaining rim 628 is a plurality of separate sections circumferentially spaced around the frame 610, but in other examples, the outer retaining rim 628 can be a single continuous component extending circumferentially around the frame 610.

[0094] The connection structure 620 including the seal area 624 can have the configurations described above and alternative configurations. For example, similar to the examples described above, in some other examples, the connection structure 620 can have a plurality of fastener receptacles configured to receive fasteners that fix the pressure relief assembly 600 to the enclosure respectively.

[0095] The valve mounting surface 612 is generally configured to sealably receive the valve 630 around the valve opening 611. The valve 630 selectively blocks the valve air flow passage 606. In the current example, the valve 630 itself can include a seal component 614 configured to form a seal with the valve mounting surface 612. In some other embodiments, the valve mounting surface 612 includes a seal component 614 configured to form a seal with the valve 630.

[0096] The valve 630 is generally configured to respond to pressure relief from the enclosure 10. The valve 630 is generally configured to respond to pressure relief from the first axial end 602 to the second axial end 604 via the frame 610. The valve 630 has a valve body 632, and the valve body 632 is sealably disposed on the valve mounting surface 612 across the valve opening 611 such that the valve air flow passage 606 is blocked by the valve body 632. The valve body 632 can be consistent with the valve body described in detail above. In the current example, the valve body has a laterally circular contour shape, but the valve body 632 can have an alternative contour shape such as a polygon.

[0097] In this example, the pressure relief assembly 600, and in particular the frame 610, has a first detent 640 that releasably secures the valve body 632 to the frame 610. The first detent 640 is configured to release the valve body 632 from the frame 610 when a minimum pressure differential occurs across the valve opening 611. In the present example, the assembly 600 has a single detent 640. The detent 640 is fixed to the frame 610. The engagement surface 644 on the detent 640 frictionally engages the valve 630, although a reverse configuration where the detent 640 is fixed to the valve 630 and frictionally engages the frame 610 is also possible. Further, different or additional forces such as magnetic forces can engage the frame 610 and the valve 630. In the present example, the detent 640 is a spring-loaded detent and has a similar configuration as described above with reference to FIGS. 1-4, although the detent 640 can also have an alternative configuration as described above. Further, in some embodiments, the pressure relief assembly can include additional detents 640 that releasably couple the valve body 632 to the frame 610.

[0098] In the present example, valve 630 has a valve body 632 and a valve stem 636. Valve stem 636 extends axially outward from valve body 632 toward the first end 602 of assembly 600. Valve stem 636 defines a mating surface 645 that frictionally engages an engaging surface 644 of detent 640. When the pressure within enclosure 10 increases such that the pressure differential between enclosure 10 and the external environment is minimized, the force between valve 630 and detent engaging surface 644 increases until the biasing force of compression spring 646 is overcome, and detent engaging surface 644 translates laterally toward the first end of detent housing 642 relative to compression spring 646. The pressure differential between enclosure 10 and the external environment creates a force that pushes valve body 632, which is not opposed by detent 640, out of valve opening 611. Valve body 632 is pushed out of frame 610 in a direction away from enclosure 10 in response to the pressure differential, allowing airflow through valve airflow passage 606 and enabling equalization of the pressure between the interior of enclosure 10 and the external environment. In some embodiments, valve body 632 is configured to allow airflow through valve airflow passage 606 when a minimum pressure differential is achieved across valve opening 611.

[0099] Figures 13 and 14 show yet another example of a pressure relief assembly 700 that is consistent with the technology disclosed in the present application. Figure 13 is a cross-sectional view of pressure relief assembly 700, and Figure 14 is an exploded perspective cross-sectional view of pressure relief assembly 700. These figures also show an exemplary enclosure 10 configured to have pressure relief assembly 700 coupled thereto. Similar to the example described above, pressure relief assembly 700 is generally configured to be coupled to enclosure 10 around enclosure opening 12. Pressure relief assembly 700 generally has a first axial end 702, a second axial end 704, and a valve airflow passage 706 extending from the first axial end 702 to the second axial end 704. Valve airflow passage 706 is selectively blocked by valve 730, which is configured to relieve pressure when the pressure within the enclosure relative to the external environment exceeds a minimum pressure differential.

[0100] The pressure relief assembly 700 has a frame 710, and a valve 730 is connected to the frame 710. The frame 710 is generally configured to support one or more components of the pressure relief assembly 700. The frame 710 has a connection structure 720, a valve mounting surface 712, and a valve opening 711 (FIG. 12) within the valve mounting surface 712. The valve air flow passage 706 selectively extends through the valve opening 711.

[0101] In the present example, a vent 750 is incorporated in the pressure relief assembly 700. Different from some of the embodiments described elsewhere in the present application, in the present example, the frame 710 does not define a vent opening separate from the valve opening 711. Rather, the valve opening 711 overlaps with the vent opening 715. In the present example, the valve body 732 defines the vent 715 and a vent mounting surface 716 around the vent 715. The vent 750 is connected to the vent mounting surface 716 across the vent 715. The vent 750 is functionally parallel to the valve 730 with respect to the air flow through the pressure relief assembly 700. However, in some embodiments, as in the example described above with reference to FIGS. 11-12, the pressure relief assembly 700 does not have a vent. In some embodiments, the vent 750 is arranged in series with the inlet relief valve with respect to the air flow through the pressure relief assembly 700 as described above with reference to FIG. 5.

[0102] as Vent 750 is positioned in fluid communication with the interior of enclosure 10. Vent 750 is configured such that gas flowing through vent 750 enables the gas to pass between the interior of enclosure 10 and the external environment of enclosure 10. Vent 750 may be consistent with the vent descriptions previously made in this application. Pressure relief assembly 700 has a vent cover 752, and vent cover 752 extends laterally across vent 750 such that vent 750 is positioned axially between frame 710 and vent cover 752. Vent cover 752 is generally axially spaced from vent 750. Vent cover 752 may be consistent with the vent covers described above. In the present example, environmental opening 754 is defined by vent cover 752 that defines a vent airflow passage between vent 750 and the external environment. In some embodiments, environmental opening 754 may be perpendicular to vent 750, but in the present example, environmental opening 754 is geometrically parallel to vent 750.

[0103] Connection structure 720 is generally configured to be sealably connected to enclosure 10 around enclosure opening 12. Connection structure 720 is generally configured to engage enclosure 10 and may be consistent with other connection structures and their variations described elsewhere in this application. Similar to the descriptions of FIGS. 11-12, connection structure 720 is configured to form a compression fit with enclosure 10 around enclosure opening 12. Connection structure 720 can include a seal region 724 configured to accommodate a seal such as seal loop 726 between pressure relief assembly 700 and enclosure 10 when pressure relief assembly 700 is connected to enclosure 10. Connection structure 720 has an inner retaining rim 727 and an outer retaining rim 728, each extending radially outward from frame 710 and forming an axially extending peripheral gap 729 configured to receive the wall of enclosure 10 around enclosure opening 12. Peripheral gap 729 is configured to compressibly receive the wall of enclosure 10 and seal loop 726.

[0104] The valve mounting surface 712 is configured to receive the valve 730 around the valve opening 711 in a manner that enables sealing of the valve 730. The valve 730 and the vent 750 selectively block the valve air flow passage 706. In the present example, the valve mounting surface 712 includes a seal component 714 configured to form a seal with the valve 730. In some other embodiments, the valve 730 itself may include a seal component 714 configured to form a seal with the valve mounting surface 712.

[0105] The valve 730 is generally configured to accommodate pressure relief from the enclosure 10. The valve 730 is generally configured to accommodate pressure relief from the first axial end 702 to the second axial end 704 via the frame 710. The valve 730 has a valve body 732, and the valve body 732 is disposed on the valve mounting surface 712 across the valve opening 711 such that the valve air flow passage 706 is blocked by the valve body 732 and the vent 750. The valve body 732 may correspond to the valve body described in detail above. In the present example, the valve body has a laterally circular contour shape, but the valve body 732 may have an alternative contour shape such as a polygonal contour shape.

[0106] In the present example, the pressure relief assembly 700, particularly the valve 730, has a first detent 740 that releasably secures the valve body 732 to the frame 710. The first detent 740 is configured to release the valve 730 when a minimum pressure differential occurs across the valve opening 711. In the present example, the assembly 700 has a single detent 740. The detent 740 is fixed to the valve 730. The engagement surface 744 on the detent 740 frictionally engages the frame 710, although a reverse configuration where the detent 740 is fixed to the frame 710 and frictionally engages the valve 730, as described above, is also possible. Further, the frame 710 and the valve 730 can be engaged by different forces such as magnetic forces or additional forces. In the present example, the detent 740 is a spring-loaded detent and has a configuration similar to that described above with reference to FIGS. 1-4, although the detent 740 can have another configuration as described above. Further, in some embodiments, the pressure relief assembly can include an additional detent 740 that releasably couples the valve body 732 to the frame 710.

[0107] In the present example, valve 730 has a valve body 732 and a valve stem 736. The valve stem 736 extends axially outwardly from the valve body 732 towards the first end 702 of the assembly 700. The valve stem 736 defines a detent receptacle in which a detent 740 is secured. The frame 710 has a mating surface 745 that is frictionally engaged by an engaging surface 744 of the detent 740. When the pressure within the enclosure 10 rises such that the pressure differential between the enclosure 10 and the external environment is minimized, the force between the frame 710 and the detent engaging surface 744 rises until it overcomes the biasing force of the compression spring 746, and the detent engaging surface 744 translates laterally relative to the compression spring 746 towards the first end of the detent housing 742. The pressure differential between the enclosure 10 and the external environment creates a force that pushes the valve body 732 out of the valve opening 711, overcoming the force applied by the detent 740 and maintaining the engagement between the valve 730 and the frame 710. The valve body 732 is pushed out of the frame 710 in a direction away from the enclosure 10 in response to the pressure differential, passing through the valve airflow passage 706 and enabling pressure equalization between the interior of the enclosure 10 and the external environment. In some embodiments, the valve body 732 is configured to allow the valve airflow passage 706 to pass therethrough when a minimum pressure differential is achieved across the valve opening 711.

[0108] FIG. 15 shows yet another example of a pressure relief assembly 800 that is consistent with the technology disclosed in the present application. FIG. 15 is an exploded perspective cross-sectional view of the pressure relief assembly 800. Similar to the embodiments described above, the pressure relief assembly 800 is generally configured to be coupled to an enclosure around an opening within the enclosure. The pressure relief assembly 800 generally has a first axial end 802, a second axial end 804, and a valve airflow passage 806 that extends from the first axial end 802 to the second axial end 804. The valve airflow passage 806 is selectively blocked by a valve 830 that is configured to relieve pressure when the pressure differential between the interior of the enclosure and the external environment exceeds a minimum pressure differential.

[0109] The pressure relief assembly 800 has a frame 810, and a valve 830 is connected to the frame 810. The frame 810 is generally configured to support one or more components of the pressure relief assembly 800. The frame 810 has a connection structure 820.

[0110] In the present example, the frame 810 defines a valve opening 811. The valve air flow passage 806 selectively extends through the valve opening 811. In the present example, a vent 850 is incorporated in the pressure relief assembly 800. Different from some embodiments described elsewhere in the present application, in the present example, the valve 830 has a valve side wall 818 that axially extends between a first axial end 802 and a second axial end 804. The valve side wall 818 extends from a vent cover 852 to a vent mounting surface 816. The valve side wall 818 surrounds the vent mounting surface 816. The valve side wall 818 is perpendicular to the valve opening 811, but in some embodiments, the valve side wall 818 can form an angle different from the valve opening 811. The valve side wall 818 defines one or more environmental openings 854. The environmental openings 854 can be defined between the vent 850 and a vent mounting surface 816 configured to define a vent air flow passage between the vent 850 and the external environment. The environmental openings 854 can be perpendicular to the vent 850. The environmental openings 854 can be axially positioned between the vent 850 and the vent mounting surface 816. In the present example, the valve side wall 818 defines a plurality of environmental openings 854, but in some embodiments, the valve side wall 818 defines a single environmental opening 854. In some embodiments, the environmental openings 854 are spaced apart around an axis x that axially extends. In some embodiments, the axis x can be the central axis of the frame 810.

[0111] In the present example, the pressure relief assembly 800 incorporates a vent 850. Unlike some of the embodiments described elsewhere in this application, in the present example, the frame 810 does not define a vent opening 815 separate from the valve opening 811. Rather, the valve opening 811 overlaps the vent opening 815. In the present example, the valve body 832 defines the vent 815 and a vent mounting surface 816 around the vent 815. The vent 850 is connected to the vent mounting surface 816 across the vent 815. The vent 850 is functionally parallel to the valve 830 with respect to the airflow through the pressure relief assembly 800. However, in some embodiments, the pressure relief assembly 800 does not have a vent. In some embodiments, the vent 850 is arranged in series with the inlet relief valve with respect to the airflow through the pressure relief assembly 800 as described above with reference to FIG. 5.

[0112] The vent 850 is configured to be positioned in fluid communication with the interior of the enclosure (not currently shown, examples of which are described and shown elsewhere in this application). The vent 850 is configured such that gas flowing through the vent 850 allows the gas to pass between the interior of the enclosure and the external environment of the enclosure. The vent 850 may be consistent with the vent description provided earlier in this application. The pressure relief assembly 800 has a vent cover 852, and the vent cover 852 extends laterally across the vent 850 such that the vent 850 is axially positioned between the frame 810 and the vent cover 852. The vent cover 852 is generally axially spaced from the vent 850. The vent cover 852 may be consistent with the vent cover described above. In the present example, the vent cover 852 does not define an environmental opening between the vent 850 and the external environment.

[0113] The coupling structure 820 is generally configured to be sealably coupled to the enclosure around the enclosure opening and may be consistent with other coupling structures and their variations described elsewhere in this application. Similar to the description of FIG. 8, the coupling structure 820 is generally configured to engage the enclosure. The coupling structure 820 includes a seal region 824 configured to accommodate a seal loop 826 between the pressure relief assembly 800 and the enclosure when the pressure relief assembly 800 is coupled to the enclosure. In the present example, the coupling structure 820 includes a threaded portion extending axially from the seal region 824. The threaded portion is configured to rotatably engage the mating inner circumferential surface of the enclosure around the enclosure opening. In this example, the coupling structure 820 is defined toward the first axial end 802 of the pressure relief assembly 800. The seal region 824 generally surrounds the valve airflow passage 806. In the present example, the seal region 824 surrounds the threaded portion. The coupling structure 820 including the seal region 824 can have the alternative configurations described above.

[0114] In the present example, the frame 810 also defines a valve mounting surface 812. The valve mounting surface 812 is configured to sealably receive the valve 830 around the valve opening 811. In the present example, the valve mounting surface 812 may be consistent with the valve mounting surface described in detail above. The valve 830 and the vent 850 selectively block the valve airflow passage 806. In the present example, the valve 830 includes a seal component 814 configured to form a seal with the valve mounting surface 812. In some other embodiments, the valve mounting surface 812 includes a seal component 814 configured to form a seal with the valve 830.

[0115] Valve 830 is generally configured to accommodate pressure relief from the enclosure. Valve 830 is generally configured to accommodate pressure relief from the first axial end 802 to the second axial end 804 via the frame 810. The valve body 832 is sealably disposed on the valve mounting surface 812 across the valve opening 811 such that the valve air flow passage 806 is blocked by the valve body 832. The valve body 832 may correspond to the valve body described in detail above.

[0116] In this example, valve 830 has a plurality of detents 840 that releasably fix the valve body 832 to the frame 810. The detents are configured to release the valve body 832 from the frame 810 when a minimum pressure difference occurs across the valve opening 811. The detents 840 are disposed around an outer surface such as the outer peripheral surface of the valve body 832. The detents 840 can have various configurations. In the present example, each of the detents 840 is a spring-type detent. The spring-type detent uses a compression spring to fix the valve 830 to the frame 810, and the valve 830 is released from the frame 810 when the release force overcomes the spring force. Each detent 840 extends laterally from the frame 810 to the valve body 832. In the present example, each detent 840 is fixed to the valve body 832 and each detent 840 frictionally engages the frame 810, although the reverse configuration where each detent 840 is fixed to the frame 810 and frictionally engages the valve body 832 is also possible. Additionally, other types of engagement such as magnetic engagement are possible. Each detent 840 can have the alternative configurations described above.

[0117] In the present example, the detents 840 releasably fix the valve body 832 to the frame 810. In some examples, although not visible at present, a hinge can pivotally connect the valve body 832 to the frame 810. The hinge may correspond to the hinge described in detail above.

[0118] When the pressure inside the enclosure rises rapidly beyond the minimum pressure difference between the inside of the enclosure and the external environment, the pressure inside the enclosure pushes against the enclosure side of the valve body 832, deploying the check 840 (similar to the above description) to remove the valve body 832 from the valve mounting surface 812. In embodiments where the valve body 832 can be released from the frame 810 or where a hinge is incorporated, it pivots away from the enclosure in response to the pressure, passing through the valve air flow passage 806, enabling equalization of the pressure between the inside of the enclosure and the external environment.

[0119] In this example, the frame 810 has frame sidewalls 813. The frame sidewalls 813 are located radially outward from the valve sidewalls 818. The frame sidewalls 813 surround the valve sidewalls 818. In the present example, the valve sidewalls 818 and the frame sidewalls 813 share a central axis. In the present example, the valve sidewalls 818 and the frame sidewalls 813 are separated by a radial gap therebetween. In some embodiments, the frame sidewalls 813 and the valve sidewalls 818 define a tortuous flow path from the external environment through the environmental opening 854 to the vent 850. As used in the present application, a "tortuous flow path" refers to a flow path that does not have a direct line of sight from the second axial end 804 to the vent 850. Such a configuration can be advantageous for preventing liquid or debris from directly impacting the vent. In some other embodiments, such as some of the other embodiments described elsewhere in the present application, there is no tortuous flow path from the external environment through the environmental opening 854 to the vent 850. In some embodiments, the frame sidewall defines one or more openings 813.

[0120] In some embodiments, the valve body 832 is generally configured such that the valve air flow passage 806 passes therethrough when a minimum pressure difference occurs across the valve opening 811. Such a configuration may be consistent with the valve body described in detail above.

[0121] FIG. 16 shows yet another example of a pressure relief assembly 900 that conforms to the technology disclosed in the present application. FIG. 16 is an exploded perspective cross-sectional view of the pressure relief assembly 900. FIG. 17 is an exploded view of the exemplary pressure relief assembly 900 from a second perspective, and FIG. 18 is a cross-sectional view of the exemplary pressure relief assembly 900 of FIG. 16. Similar to the example described above, the pressure relief assembly 900 is generally configured to be coupled to the enclosure 10 around the opening 12 of the enclosure 10. The pressure relief assembly 900 generally has a first axial end 902, a second axial end 904, and a valve airflow passage 906 extending from the first axial end 902 to the second axial end 904. The valve airflow passage 906 is selectively blocked by a valve 930, which is configured to relieve pressure when the pressure difference between the interior of the enclosure and the external environment exceeds a minimum pressure difference.

[0122] The pressure relief assembly 900 has a frame 910, and the valve 930 is coupled to the frame 910. The frame 910 is generally configured to support one or more components of the pressure relief assembly 900. The frame 910 has a coupling structure 920. The coupling structure 920 may conform to the coupling structure described in detail above.

[0123] In the present example, the frame 910 defines a valve opening 911. The valve airflow passage 906 selectively extends through the valve opening 911. In the present example, the pressure relief assembly 900 incorporates a vent 950. As described above with reference to FIG. 15, in the present example, the valve 930 has an axial sidewall 918 that extends axially from the vent cover 952 to the vent mounting surface 916. The axial sidewall 918 surrounds the vent mounting surface 916. The axial sidewall 918 defines one or more environmental openings 954. The environmental openings 954 can be defined between the vent 950 and the vent mounting surface 916. The environmental openings 954 define a part of the vent airflow path between the vent 950 and the external environment. The environmental openings 954 can be perpendicular to the vent 950. The environmental openings 954 can be axially positioned between the vent 950 and the vent mounting surface 916. In the present example, the axial sidewall 918 defines a plurality of environmental openings 954, but in some embodiments, the axial sidewall 918 defines a single environmental opening 954. In some embodiments, the environmental openings 954 are spaced apart around an axis x that extends axially. The axis x can be the central axis of the frame 910. The valve 930 and the environmental openings 954 can be consistent with the above description.

[0124] Vent 950 is configured to be positioned in fluid communication with the interior of enclosure 10 (Figs. 16 and 18). Vent 950 is configured such that gas can flow through vent 950 to allow gas to pass between the interior of enclosure 10 and the external environment of enclosure 10. Vent 950 may be consistent with the vent descriptions previously made in this application. Pressure relief assembly 900 has a vent cover 952, and vent cover 952 extends laterally across vent 950 such that vent 950 is axially positioned between frame 910 and vent cover 952. Vent cover 952 is generally axially spaced from vent 950. Vent cover 952 may be consistent with the vent covers described above. In the present example, vent cover 952 does not define an environmental opening between vent 950 and the external environment. Connection structure 920 is generally configured to be sealingly connectable to enclosure 10 around enclosure opening 12 and may be consistent with other connection structures and variations thereof described elsewhere in this application. Connection structure 920 is generally configured to engage enclosure 10. In the present example, similar to the description of Fig. 9, connection structure 920 has a bayonet connector 522 configured to be received by a mating bayonet connector defined by the enclosure. In this example, connection structure 920 is defined towards the first axial end 902 of pressure relief assembly 900. Connection structure 920 may include a seal region 924 configured to accommodate a seal such as seal loop 926 between pressure relief assembly 900 and enclosure 10 when pressure relief assembly 900 is connected to enclosure 10. Seal region 924 can surround valve opening 911 as in the presently shown example. Seal region 924 surrounds valve air flow passage 906. Connection structure 920 including seal region 924 can have the configurations and alternative configurations described above.

[0125] Valve 930 is generally configured to accommodate pressure relief from the enclosure. Valve 930 is generally configured to accommodate pressure relief from the first axial end 902 to the second axial end 904 via the frame 910. The valve body 932 is sealably disposed on the valve mounting surface 912 across the valve opening 911 such that the valve air flow passage 906 is blocked by the valve body 932. The valve body 932, the valve 930, and the valve mounting surface 912 may correspond to the valve body described in detail above.

[0126] In this example, the valve 930 has a plurality of detents 940 that releasably fix the valve body 932 to the frame 910. The detents are configured to release the valve body 932 from the frame 910 when a minimum pressure difference occurs across the valve opening 911. The detents 940 are disposed around the outer peripheral surface of the valve body 932, for example. In the present example, the detents 940 may correspond to the valve body described in detail above.

[0127] When the pressure inside the enclosure rapidly rises beyond the minimum pressure difference between the inside of the enclosure and the external environment, the pressure inside the enclosure pushes on the enclosure side of the valve body 932, deploying the detents 940 (similar to the description above) to remove the valve body 932 from the valve mounting surface 912. The deployment mechanism may correspond to the valve body described in detail above.

[0128] In some embodiments, the valve body 932 is generally configured to allow passage of the valve air flow passage 906 when a minimum pressure difference occurs across the valve opening 911. Such a configuration may correspond to the valve body described in detail above.

[0129] In the present example, the pressure relief assembly 900 incorporates a vent 950. In the present example, the valve body 932 defines a vent opening 915 and a vent mounting surface 916 around the vent opening 915. The vent 950 is connected to the vent mounting surface 916 across the vent opening 915. The vent 950 is functionally parallel to the valve 930 with respect to the airflow passing through the pressure relief assembly 900. The vent opening 915 may coincide with the vent opening described in detail above.

[0130] In the present example, the frame 910 has a frame side wall 913 that coincides with the description of the frame side wall 913 described in detail above with reference to FIG. 15. The frame side wall 913 is configured to be located radially outward from the valve side wall 818.

[0131] In the present example, the pressure relief assembly 900 has a guard 960. The guard 960 is generally configured to prevent material from passing out of the enclosure 10 from within the enclosure 10, especially when the valve body 932 is released from the frame 910. The guard 960 generally extends across the valve airflow passage 906. The guard is generally configured to be fixed to the valve airflow passage 906. In some embodiments, the guard 960 extends across the vent airflow passage. In the present example, the guard 960 defines a plurality of openings 964 spaced laterally across the valve airflow passage 906. In various embodiments, the guard 960 defines a plurality of openings 964 spaced laterally across the vent airflow passage. The guard 960 may have any suitable number of openings 964, each of which may have any suitable opening shape. Examples of suitable axial cross-sectional shapes of the openings 964 include rectangular, circular, polygonal, and irregular shapes. The openings 964 are generally sized to impede the passage of particles having a minimum size. In particular, each of the openings 964 has a cross-sectional area less than the cross-sectional area of the particles configured to be impeded by the guard 960.

[0132] The guard 960 is generally located towards the first axial end 902 of the assembly 900. In embodiments, the vent assembly may include two or more guards 960. In embodiments, the guard 960 may include a plurality of axially stacked layers, each layer defining a plurality of openings. In one such example, the plurality of openings of one layer are not axially laterally aligned with the plurality of openings of the other layer to form a serpentine flow path through the first end 902 of the assembly 900.

[0133] The guard 960 is generally fixed relative to the valve opening 906, but the configuration for fixing the guard 960 relative to the valve opening 906 is not particularly limited. In some embodiments, the guard 960 is fixed to the enclosure 10. In the present example, the guard 960 is fixed to the frame 910. The frame 910 and the guard 960 are fixed via a connecting portion 929. In the present example, the connecting portion 929 defines an interference fit. In the present example, the connecting portion 929 includes a plurality of connecting receptacles 962 defined by the guard 960, each configured to frictionally engage with a corresponding connecting protrusion 928 of the frame 910 to fix the guard 960 to the frame 910. The connecting portion 929 may have any suitable number of connecting protrusions 928, each having any suitable shape. Each connecting receptacle forms a mating shape configured to engage with a corresponding structure defined by the guard 960. In some alternative embodiments, the frame 910 can define the connecting receptacles and the guard can define the connecting protrusions. In various embodiments, the connecting receptacles and the connecting protrusions can be welded via, for example, thermal welding to further fix the guard 960 to the frame 910.

[0134] Other types of interference fits between the guard 960 and the frame 910 are also conceivable. In some embodiments, the connecting portion 929 can form a snap-fit connection between the guard 960 and the frame 910. As another example, the connecting portion 929 can include a threaded fastener such as a screw configured to engage an aligned fastener receptacle 962 defined by the guard 960 and the frame 910. As another example, the connecting portion 929 can define a bayonet connection between the guard 960 and the frame 910. In some embodiments, the guard 960 can be connected to the frame 910 using an adhesive, via welding, or via other approaches.

[0135] In some embodiments, one of the guard 960 and the enclosure 10 defines a connecting protrusion, and the other of the guard 960 and the enclosure 10 defines a connecting receptacle configured to be connected.

[0136] Note that the guard is not generally limited to embodiments consistent with FIGS. 16-18. The guard can be used with any of the pressure relief assemblies described herein.

[0137] Exemplary aspects Aspect 1: A frame including a connecting structure, a valve mounting surface, a valve opening within the valve mounting surface, a vent mounting surface, and a vent opening within the vent mounting surface, wherein the vent opening is functionally parallel to the valve opening, and A valve body sealably disposed on the valve mounting surface across the valve opening, A first detent for releasably fixing the valve body to the frame, the first detent being configured to release the valve body from the frame when a minimum pressure difference occurs across the valve opening, and A vent connected to the vent mounting surface across the vent opening, and A pressure relief assembly including.

[0138] Aspect 2: The pressure relief assembly according to any one of Aspect 1 and Aspects 3 to 23, further including a vent cover extending horizontally across the vent, wherein the vent is axially positioned between the frame and the vent cover.

[0139] Aspect 3: The pressure relief assembly according to any one of Aspect 1 and Aspects 4 to 23, wherein the vent cover and the valve body are a single integral component.

[0140] Aspect 4: The pressure relief assembly according to any one of Aspects 1 to 3 and 5 to 23, further defining an environmental opening perpendicular to the vent cover.

[0141] Aspect 5: The pressure relief assembly according to any one of Aspects 1 to 4 and 6 to 23, wherein the environmental opening is axially positioned between the vent cover and the vent.

[0142] Aspect 6: The pressure relief assembly according to any one of Aspects 1 to 5 and 7 to 23, wherein the environmental opening is defined by the vent cover.

[0143] Aspect 7: The pressure relief assembly according to any one of Aspects 1 to 6 and 8 to 23, wherein the vent is a breathable membrane.

[0144] Aspect 8: The pressure relief assembly according to any one of Aspects 1 to 7 and 9 to 23, further including a second check valve for releasably fixing the valve body to the frame.

[0145] Aspect 9: The pressure relief assembly according to any one of Aspects 1 to 8 and 11 to 23, wherein the second check valve extends laterally from the frame to the valve body and is configured to release the valve body from the frame when a minimum pressure difference occurs across the valve opening.

[0146] Aspect 10: The pressure relief assembly according to any one of Aspects 1 to 9 and 11 to 23, wherein the second detent is a spring detent.

[0147] Aspect 11: The pressure relief assembly according to any one of Aspects 1 to 10 and 12 to 23, further including a hinge that pivotally connects the valve body to the frame.

[0148] Aspect 12: The pressure relief assembly according to any one of Aspects 1 to 11 and 13 to 23, wherein the hinge is located on the laterally opposite side of the first detent with respect to the valve body.

[0149] Aspect 13: The pressure relief assembly according to any one of Aspects 1 to 12 and 14 to 23, wherein the first detent extends laterally from the frame to the valve body.

[0150] Aspect 14: The pressure relief assembly according to any one of Aspects 1 to 13 and 15 to 23, further including a valve stem extending axially from the valve body, and the first detent extends laterally from the frame to the valve stem.

[0151] Aspect 15: The pressure relief assembly according to any one of Aspects 1 to 14 and 16 to 23, wherein the first detent is a spring detent.

[0152] Aspect 16: The pressure relief assembly according to any one of Aspects 1 to 15 and 17 to 23, wherein the first detent includes a detent housing having a first end and an open second end, a compression spring disposed within the detent housing, the compression spring extending from the first end toward the open second end, and a detent engagement surface disposed translatably within the detent housing, the compression spring being disposed compressibly between the detent engagement surface and the first end of the detent housing.

[0153] Aspect 17: The pressure relief assembly according to any one of Aspects 1 to 16 and 18 to 23, wherein the first check valve is a magnet.

[0154] Aspect 18: The pressure relief assembly according to any one of Aspects 1 to 17 and 19 to 23, wherein the valve body has a circular contour in the lateral direction.

[0155] Aspect 19: The pressure relief assembly according to any one of Aspects 1 to 18 and 20 to 23, wherein the vent opening is geometrically parallel to the valve opening.

[0156] Aspect 20: The pressure relief assembly according to any one of Aspects 1 to 19 and 21 to 23, wherein the vent opening is geometrically non - parallel to the valve opening.

[0157] Aspect 21: The pressure relief assembly according to any one of Aspects 1 to 20 and 22 to 23, further comprising a guard connected to the frame, the guard defining a plurality of openings spaced laterally across the valve air flow path.

[0158] Aspect 22: The pressure relief assembly according to any one of Aspects 1 to 21 and 23, further comprising a guard connected to the frame, the guard defining a plurality of openings spaced laterally across the valve air flow path and the vent air flow path.

[0159] Aspect 23: The pressure relief assembly according to any one of Aspects 1 to 22, wherein the guard is located towards the first end of the valve assembly.

[0160] Aspect 24: A pressure relief assembly, a frame including a connection structure, a valve mounting surface, and a valve opening within the valve mounting surface, the pressure relief assembly having a first axial end, a second axial end, and a valve air flow path extending from the first axial end through the valve opening to the second axial end. A valve body that is disposed sealably on the valve mounting surface across the valve opening, thereby closing the valve air flow passage, and A first spring-loaded detent that releasably fixes the valve body to the frame, the first spring-loaded detent being configured to release the valve body from the frame when a minimum pressure difference occurs across the valve opening, the first spring-loaded detent, and including The valve body is a pressure relief assembly configured to allow the valve air flow passage to pass through when a minimum pressure difference occurs across the valve opening.

[0161] Aspect 25: The pressure relief assembly according to any one of Aspects 24 and 26 to 44, wherein the first spring-loaded detent extends laterally from the frame to the valve body.

[0162] Aspect 26: Further including a valve stem extending axially from the valve body, the pressure relief assembly according to any one of Aspects 24 to 25 and 27 to 44, wherein the first spring-loaded detent extends laterally from the frame to the valve stem.

[0163] Aspect 27: Further including a plurality of spring-loaded detents including the first spring-loaded detent, each of the plurality of spring-loaded detents releasably fixing the valve body to the frame, each of the plurality of spring-loaded detents extending laterally from the frame to the valve body, and each spring-loaded detent being configured to release the valve body from the frame when a minimum pressure difference occurs across the valve opening, the pressure relief assembly according to any one of Aspects 24 to 26 and 28 to 44.

[0164] Aspect 28: Further including a vent, the frame further includes a vent mounting surface and a vent opening within the vent mounting surface, the vent opening is functionally parallel to the valve opening, and the vent is connected to the vent mounting surface across the vent opening. The pressure relief assembly according to any one of Aspects 24 - 27 and 29 - 44.

[0165] Aspect 29: Further including a vent, the valve body includes a vent mounting surface and a vent opening within the vent mounting surface, the vent opening is functionally parallel to the valve opening, and the vent is connected to the vent mounting surface across the vent opening. The pressure relief assembly according to any one of Aspects 24 - 28 and 30 - 44.

[0166] Aspect 30: The valve includes a valve side wall around the vent opening, the frame includes a frame side wall around the valve opening, and the frame side wall is radially outwardly spaced from the valve side wall. The pressure relief assembly according to any one of Aspects 24 - 29 and 32 - 44.

[0167] Aspect 31: Further including a vent cover extending horizontally across the vent, and the vent is axially positioned between the frame and the vent cover. The pressure relief assembly according to any one of Aspects 24 - 30 and 32 - 44.

[0168] Aspect 32: The vent cover and the valve body are a single integral component. The pressure relief assembly according to any one of Aspects 24 - 32 and 34 - 44.

[0169] Aspect 33: Further defining an environmental opening perpendicular to the vent cover. The pressure relief assembly according to any one of Aspects 24 - 32 and 34 - 44.

[0170] Aspect 34: The environmental opening is axially positioned between the vent cover and the vent. The pressure relief assembly according to any one of Aspects 24 - 33 and 35 - 44.

[0171] Aspect 35: The pressure relief assembly according to any one of Aspects 24 to 34 and 36 to 44, wherein the environmental opening is defined by the vent cover.

[0172] Aspect 36: The pressure relief assembly according to any one of Aspects 24 to 35 and 37 to 44, wherein the vent opening is geometrically parallel to the valve opening.

[0173] Aspect 37: The pressure relief assembly according to any one of Aspects 24 to 36 and 38 to 44, wherein the vent opening is geometrically non - parallel to the valve opening.

[0174] Aspect 38: The pressure relief assembly according to any one of Aspects 24 to 37 and 39 to 44, wherein the vent is a breathable membrane.

[0175] Aspect 39: The pressure relief assembly according to any one of Aspects 24 to 38 and 40 to 44, further comprising a hinge that pivotally connects the valve body to the frame.

[0176] Aspect 40: The pressure relief assembly according to any one of Aspects 24 to 39 and 41 to 44, wherein the hinge is located on the side opposite to the first detent in the lateral direction with respect to the valve body.

[0177] Aspect 41: The first spring - type detent has a detent housing having a first end and a second end, and a compression spring disposed within the detent housing, the compression spring extending from the first end to the second end, a compression spring, and a detent engagement surface disposed translatably within the detent housing, and the compression spring is disposed compressibly between the detent engagement surface and the first end of the detent housing. The pressure relief assembly according to any one of Aspects 24 to 40 and 42 to 44.

[0178] Aspect 42: The pressure relief assembly according to any one of Aspects 24 to 41 and 43 to 44, wherein the valve body has a circular contour in the lateral direction.

[0179] Aspect 43: The pressure relief assembly according to any one of Aspects 24 to 42 and 44, further including a guard connected to the frame, the guard defining a plurality of openings spaced laterally across the valve air flow passage.

[0180] Aspect 44: The pressure relief assembly according to any one of Aspects 24 to 43, wherein the guard is located towards the first end of the valve assembly.

[0181] Aspect 45: A pressure relief assembly, including a connection structure, a valve mounting surface, and a frame including a valve opening within the valve mounting surface, a valve body sealably disposed on the valve mounting surface across the valve opening, a first spring-loaded detent for releasably fixing the valve body to the frame, the first spring-loaded detent being configured to release the valve body from the frame when a minimum pressure difference occurs across the valve opening, and the first spring-loaded detent includes a detent housing having a first end and a second end, a compression spring disposed within the detent housing, the compression spring extending from the first end to the second end, and a detent engagement surface slidably disposed within the detent housing, the compression spring being compressibly disposed between the detent engagement surface and the first end of the detent housing.

[0182] Aspect 46: The frame includes a vent mounting surface and a vent opening within the vent mounting surface, the vent opening being functionally parallel to the valve opening, and the pressure relief assembly further includes a vent connected to the vent mounting surface across the vent opening, the pressure relief assembly according to any one of Aspects 45 and 47 to 65.

[0183] Aspect 47: Further including a vent, the valve body includes a vent mounting surface and a vent opening within the vent mounting surface, the vent opening being functionally parallel to the valve opening, and the vent is connected to the vent mounting surface across the vent opening, the pressure relief assembly according to any one of Aspects 45 to 46 and 48 to 65.

[0184] Aspect 48: The vent opening is geometrically parallel to the valve opening, the pressure relief assembly according to any one of Aspects 45 to 47 and 49 to 65.

[0185] Aspect 49: The vent opening is geometrically non - parallel to the valve opening, the pressure relief assembly according to any one of Aspects 45 to 48 and 50 to 65.

[0186] Aspect 50: Further including a vent cover extending laterally across the vent, the vent being axially positioned between the frame and the vent cover, the pressure relief assembly according to any one of Aspects 45 to 49 and 51 to 65.

[0187] Aspect 51: The vent cover and the valve body are a single integral component, the pressure relief assembly according to any one of Aspects 45 to 50 and 52 to 65.

[0188] Aspect 52: Further defining an environmental opening perpendicular to the vent cover, the pressure relief assembly according to any one of Aspects 45 to 51 and 53 to 65.

[0189] Aspect 53: The pressure relief assembly according to any one of Aspects 45 to 52 and 54 to 65, wherein the environmental opening is axially positioned between the vent cover and the vent.

[0190] Aspect 54: The pressure relief assembly according to any one of Aspects 45 to 53 and 55 to 65, wherein the environmental opening is defined by the vent cover.

[0191] Aspect 55: The pressure relief assembly according to any one of Aspects 45 to 54 and 56 to 65, wherein the vent is a breathable membrane.

[0192] Aspect 56: The pressure relief assembly according to any one of Aspects 45 to 55 and 57 to 65, wherein the valve body has a laterally circular contour.

[0193] Aspect 57: The pressure relief assembly according to any one of Aspects 45 to 56 and 58 to 65, wherein the first spring-loaded detent extends laterally from the frame to the valve body.

[0194] Aspect 58: The pressure relief assembly according to any one of Aspects 45 to 57 and 59 to 65, further including a valve stem extending axially from the valve body, and the first spring-loaded detent extends from the frame to the valve stem.

[0195] Aspect 59: The pressure relief assembly according to any one of Aspects 45 to 58 and 59 to 65, further including a second spring-loaded detent for releasably fixing the valve body to the frame.

[0196] Aspect 60: The pressure relief assembly according to any one of Aspects 45 to 59 and 61 to 65, wherein the second spring-loaded detent extends laterally from the frame to the valve body and is configured to release the valve body from the frame when a minimum pressure difference occurs across the valve opening.

[0197] Aspect 61: A pressure relief assembly according to any one of Aspects 45 to 60 and 62 to 65, further including a hinge that pivotally connects the valve body to the frame.

[0198] Aspect 62: A pressure relief assembly according to any one of Aspects 45 to 61 and 63 to 65, wherein the hinge is located on the lateral opposite side of the first spring-loaded detent with respect to the valve body.

[0199] Aspect 63: A pressure relief assembly according to any one of Aspects 45 to 62 and 64 to 65, wherein the valve includes a valve side wall around the vent opening, the frame includes a frame side wall around the valve opening, and the frame side wall is radially outwardly spaced from the valve side wall.

[0200] Aspect 64: A pressure relief assembly according to any one of Aspects 45 to 63 and 65, further including a guard connected to the frame, the guard defining a plurality of openings that are laterally spaced across the valve air flow path.

[0201] Aspect 65: A pressure relief assembly according to any one of Aspects 45 to 64, wherein the guard is located toward the first end of the valve assembly.

[0202] Note that, as used in this specification and the appended claims, the term "configured" describes a system, apparatus, or other structure that is constructed to perform a particular task or adopt a particular configuration. The term "configured" can be used interchangeably with similar terms such as "arranged", "constructed", "manufactured", etc.

[0203] All publications and patent applications cited in this specification are indicative of the level of skill of the relevant art. All publications and patent applications are hereby incorporated by reference into this application as if each individual publication or patent application were specifically and individually indicated to be incorporated by reference. In case of conflict between the disclosure of this application and the disclosure of any document incorporated herein by reference, the disclosure of this application shall apply.

[0204] This application is intended to cover adaptations or variations of the present subject matter. It is intended that the above description be illustrative rather than limiting, and it should be understood that the claims are not limited to the exemplary embodiments described herein.

Claims

1. a frame including a coupling structure, a valve mounting surface, a valve opening in the valve mounting surface, a vent mounting surface, and a vent opening in the vent mounting surface, the vent opening being functionally aligned with the valve opening; a valve body sealably positioned on the valve mounting surface across the valve opening; a first detent releasably securing the valve body to the frame, the first detent configured to release the valve body from the frame upon a minimum pressure differential across the valve opening; and a vent coupled to the vent mounting surface across the vent opening; Includes pressure relief assembly.

2. The pressure relief assembly of claim 1 further comprising a hinge pivotally connecting said valve body to said frame.

3. 3. The pressure relief assembly of claim 1, wherein the first detent extends laterally from the frame to the valve body.

4. 3. The pressure relief assembly of claim 1, further comprising a valve stem extending axially from the valve body, the first detent extending transversely from the frame to the valve stem.

5. the first detent includes a detent housing having a first end and an open second end, a compression spring disposed within the detent housing, the compression spring extending from the first end toward the open second end, and a detent engagement surface translatably disposed within the detent housing; The pressure relief assembly of claim 1 or 2, wherein the compression spring is compressibly disposed between the detent engagement surface and a first end of the detent housing.

6. The pressure relief assembly of claim 1 or 2, wherein the first detent is a magnet.

7. 3. The pressure relief assembly of claim 1, wherein the vent opening is geometrically non-parallel to the valve opening.

8. 3. The pressure relief assembly of claim 1, further comprising a guard coupled to the frame, the guard defining a plurality of openings spaced laterally across the valve airflow passage and the vent opening.

9. 1. A pressure relief assembly comprising: a frame including a coupling structure, a valve mounting surface, and a valve opening in the valve mounting surface, the pressure relief assembly having a first axial end, a second axial end, and a valve airflow passage extending through the valve opening from the first axial end to the second axial end; a valve body sealably positioned on the valve mounting surface across the valve opening to block the valve airflow flow path; a first spring detent releasably securing the valve body to the frame, the first spring detent configured to release the valve body from the frame upon a minimum pressure differential across the valve opening; and Including, The valve body is configured to open the valve airflow path when there is the minimum pressure differential across the valve opening.

10. 10. The pressure relief assembly of claim 9, further comprising a vent, wherein the frame further comprises a vent mounting surface and a vent opening in the vent mounting surface, the vent opening being in functional parallel with the valve opening, and the vent coupled to the vent mounting surface across the vent opening.

11. 11. A pressure relief assembly as claimed in any one of claims 9 and 10, further comprising a vent, wherein the valve body includes a vent mounting surface and a vent opening in the vent mounting surface, the vent opening being in functional parallel with the valve opening, and the vent being coupled to the vent mounting surface across the vent opening.

12. 11. The pressure relief assembly of claim 10, wherein the valve includes a valve sidewall around the vent opening and the frame includes a frame sidewall around the valve opening, the frame sidewall being spaced radially outward from the valve sidewall.

13. The pressure relief assembly of claim 10, wherein the vent opening is geometrically parallel to the valve opening.

14. The pressure relief assembly of claim 10, wherein the vent opening is geometrically non-parallel to the valve opening.

15. 11. The pressure relief assembly of claim 9, further comprising a hinge pivotally connecting the valve body to the frame.

16. 1. A pressure relief assembly comprising: a frame including a coupling structure, a valve mounting surface, and a valve opening within the valve mounting surface; a valve body sealably positioned on the valve mounting surface across the valve opening; a first spring detent releasably securing the valve body to the frame, the first spring detent configured to release the valve body from the frame upon a minimum pressure differential across the valve opening; and Including, the first spring-loaded detent includes a detent housing having a first end and a second end, a compression spring disposed within the detent housing, the compression spring extending from the first end to the second end, and a detent engagement surface translatably disposed within the detent housing; The pressure relief assembly, wherein the compression spring is compressibly disposed between the detent engagement surface and a first end of the detent housing.

17. 17. The pressure relief assembly of claim 16, wherein the frame includes a vent mounting surface and a vent opening within the vent mounting surface, the vent opening being in functional parallel with the valve opening, and the pressure relief assembly further includes a vent coupled to the vent mounting surface across the vent opening.

18. 18. The pressure relief assembly of claim 17, wherein the valve includes a valve sidewall around the vent opening and the frame includes a frame sidewall around the valve opening, the frame sidewall being spaced radially outward from the valve sidewall.

19. 18. A pressure relief assembly according to any one of claims 16 and 17, further comprising a guard coupled to the frame, the guard defining a plurality of openings spaced laterally across the valve airflow flow path.

20. 20. The pressure relief assembly of claim 19, wherein the guard is located toward a first end of the valve assembly.

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