Check valve with secondary backflow seal

Abstract

To provide a check valve capable of solving the problem in which particulate or debris in a fluid can become lodged in the check valve thereby hindering the valve from closing as intended.SOLUTION: A check valve is disclosed having a primary seal and a secondary seal, where the primary and secondary seals resist movement of a fluid through the check valve, and the secondary seal can provide a backup seal in an instance where the check valve does not function as intended. The primary and secondary seals can be formed by first and second sealing ridges, respectively, and a valve body can be positioned within the check valve, between a valve support, the first sealing ridge, and the second sealing ridge. The valve body is configured to move relative to the first and second sealing ridges, and can have a position in which a portion of the valve body is engaged with any of the first and second sealing ridges.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] This disclosure relates generally to controlling the direction of fluid flow. More specifically, this disclosure relates to controlling fluid flow using check valves. [Background technology]

[0002] A check valve is a device that allows fluid to move through the valve in a first direction and restricts or resists fluid movement through the valve in a second direction different from the first direction. Fluid movement in the second direction through the valve is commonly referred to as backflow.

[0003] Check valves may be used in many types of applications, including pumps such as piston-driven pumps and diaphragm pumps, fluid systems for industrial processes including chemical plants and power plants, fluid control systems such as irrigation sprinklers and drip irrigation, and medical applications such as ventricular valves, infusion therapy, and other fluid and / or drug transfer.

[0004] A check valve may include a valve element, typically shaped like a disk that forms a diaphragm. The valve element can move to allow or resist fluid movement through a passageway of the check valve. In some cases, the valve element can have a closed position in which the valve engages a portion of the check valve to resist fluid movement therethrough, and the valve element can have an open position in which the valve moves relative to a portion of the check valve to allow fluid movement therethrough.

[0005] A check valve can be moved to an open position to allow fluid to pass therethrough by fluid pressure or engagement of the fluid against the valve. When the check valve's cracking pressure is achieved, the check valve moves from a closed position to an open position. The cracking pressure corresponds to the difference in pressure in the fluid passage upstream of the valve disc relative to the pressure in the fluid passage downstream of the valve disc. In some check valves, the valve moves to an open position when a positive pressure differential is applied to the valve disc, for example, when the pressure upstream of the valve disc is greater than the pressure downstream of the valve disc.

[0006] The disc can move to the closed position when the positive pressure differential is reduced, removed, or reversed. For example, the disc can move to the closed position when backflow of fluid occurs, i.e., when fluid moves from the downstream portion of the check valve toward the upstream portion of the check valve. A negative pressure differential, such as when the fluid pressure downstream of the disc is greater than the fluid pressure upstream of the disc, can move the disc to the closed position. In some cases, the inherent resiliency of the disc can also move the disc to the closed position. Summary of the Invention [Problem to be solved by the invention]

[0007] If the disc does not move to a closed position or does not resist the backflow of fluid through the check valve, the check valve may not function as intended. For example, if particulates or debris become lodged in the check valve, the check valve may not move to a closed position or resist the backflow of fluid. In some cases, particulates or debris may become lodged between the disc and another part of the check valve, causing the disc to resist fluid flow or to block or not complete the fluid passage.

[0008] Check valves can also fail to function as intended when pressure differentials between the upstream and downstream portions of a fluid passage cause the valve to disengage or move in an unintended manner. For example, if downstream pressure is significantly greater than the check valve's intended operating parameters, the disc may disengage from its seat or support surface, and the disc may move toward or be extruded into the upstream portion of the fluid passage.

[0009] In accordance with at least some embodiments disclosed herein, it is recognized that while check valves can be designed to have certain performance characteristics, certain problems can arise during the use, manufacture, and assembly of check valves. For example, particulates or debris in the fluid can become lodged in the check valve, thereby preventing the valve from closing as intended. [Means for solving the problem]

[0010] One aspect of the present disclosure provides a check valve having a housing with an internal cavity, a first port, and a second port, wherein an upstream fluid passage extends through the first port to the internal cavity and a downstream fluid passage extends through the second port to the internal cavity; a first seal ridge extending into the internal cavity and including a periphery extending around the first port; a second seal ridge extending into the internal cavity, the second seal ridge including a periphery extending around the upstream fluid passage such that the first seal ridge is between the first port and the second seal ridge; a valve support having a valve support surface; and a valve disc disposed in the internal cavity, the valve disc including a first portion movable relative to the first seal ridge, a second portion movable relative to the second seal ridge, and a third portion engaged with the valve support surface.

[0011] Some examples of the present disclosure include a housing having an internal cavity, a first port, and a second port, wherein an upstream fluid passage extends through the first port to the internal cavity and a downstream fluid passage extends through the second port to the internal cavity; a first seal ridge extending into the internal cavity and including a periphery extending around the first port; and a second seal ridge extending into the internal cavity, including a periphery extending around the upstream fluid passage such that the first seal ridge is between the first port and the second seal ridge. and a valve body disposed within the internal cavity, the valve body having a first closed position in which a first portion of the valve body is engaged against the first seal ridge and a second portion of the valve body is spaced apart from the second seal ridge, an open position in which the first and second portions of the valve body are spaced apart from the first and second seal ridges, respectively, and a second closed position in which at least a portion of the first portion of the valve body is engaged against the first seal ridge and the second portion of the valve body is engaged against the second seal ridge.

[0012] Some examples of the present disclosure provide a method of controlling flow, the method including: providing a check valve defining an internal cavity having a fluid passageway extending therethrough, a first seal ridge, and a second seal ridge; and providing a valve body within the internal cavity in a first closed position, wherein a first portion of the valve body is engaged against the first seal ridge and a second portion of the valve body is spaced from the second seal ridge to resist movement of fluid between an upstream portion and a downstream portion of the fluid passageway, the valve body being movable to a second closed position such that at least a portion of the first portion of the valve body is engaged against the first seal ridge and the second portion of the valve body moves toward and engages the second seal ridge.

[0013] Additional features and advantages of the subject technology will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the subject technology. The advantages of the subject technology will be realized and attained by the structure particularly pointed out in the description and embodiments herein, as well as the accompanying drawings.

[0014] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the subject technology.

[0015] Various configurations of exemplary embodiments of the present invention are described below with reference to the drawings. The illustrated embodiments are intended to illustrate, but not to limit, the present invention. The drawings include the following figures: [Brief explanation of the drawings]

[0016] [Figure 1] 1 illustrates a check valve coupled to a patient via an intravenous tube, according to aspects of the present disclosure. [Figure 2] 1 shows an exploded perspective view of a check valve according to an aspect of the present disclosure. [Figure 3] 1 illustrates a cross-sectional elevation view of a check valve according to an aspect of the present disclosure. [Figure 4]FIG. 1 illustrates a perspective view of an upper housing of a check valve according to an aspect of the present disclosure. [Figure 5] 1 illustrates a cross-sectional elevation view of a disc-less check valve according to an aspect of the present disclosure. [Figure 6] FIG. 1 illustrates a perspective view of a lower housing of a check valve according to an aspect of the present disclosure. [Figure 7] 4 illustrates a cross-sectional elevation view of the check valve of FIG. 3 according to an embodiment of the present disclosure. [Figure 8] 4 illustrates a cross-sectional elevation view of the check valve of FIG. 3 according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0017] In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the subject technology. It should be understood that the subject technology may be practiced without some of these specific details. In other instances, well-known structures and techniques are not shown in detail so as not to obscure the subject technology.

[0018] Moreover, while the description sets forth specific details of various embodiments, it will be understood that the description is merely illustrative and should not be construed as limiting in any way, and that various applications of and modifications to such embodiments that may occur to those skilled in the art are also encompassed by the general concepts described herein.

[0019] According to some embodiments, the present application discloses various configurations and advantages of check valves. The check valve allows fluid to move through the check valve in a first direction and can resist fluid movement through the check valve in a second direction different from the first direction, for example, during reverse flow through the check valve. The present disclosure also provides check valve configurations that can resist fluid movement through the check valve when the valve body does not close as intended. By including a primary seal and a secondary seal, check valves having the disclosed configurations can resist fluid movement through the check valve when the valve body does not close as intended during reverse flow. Furthermore, according to some embodiments, the various configurations and advantages of the present application can increase the reliability of the check valve, simplify the manufacturing of check valve components, and increase the assembly efficiency of the check valve.

[0020] In at least some embodiments, a check valve includes a valve disc that can have one or more open positions and one or more closed positions. For example, the valve disc can have an open position in which at least a portion of the valve disc is moved to allow fluid to move through the fluid passage of the check valve. The valve disc can have a closed position (e.g., a first closed position) in which at least a portion of the valve disc obstructs or resists movement of fluid through the fluid passage, such as during reverse flow through the check valve. The check valve can also have another closed position (e.g., a second closed position) in which another portion of the valve disc is moved to obstruct or resist movement of fluid through the fluid passage, such as when the valve disc does not obstruct the fluid passage as intended during reverse flow through the check valve.

[0021] In some embodiments, the valve disc includes a first closed position and a second closed position, and when the valve disc is in the first closed position, a first portion of the valve disc blocks a fluid passage through the check valve, and when the valve disc is in the second closed position, the first portion of the valve disc and the second portion of the valve disc block the fluid passage.

[0022] The check valve can be configured such that a first portion of the disc engages a first sealing surface of the check valve to form a primary seal, thereby blocking the fluid passageway, and a second portion of the disc engages a second seal of the check valve to form a secondary seal, thereby also blocking the fluid passageway. In some aspects of the present disclosure, the primary and secondary seals are arranged in series along the fluid passageway through the check valve. In some embodiments, it is contemplated that either the first and second portions of the disc can move relative to each other and / or relative to another portion of the check valve.

[0023] The check valve may include an inlet port and an outlet port, a fluid passage extending between the inlet port and the outlet port, and a valve disc disposed within the fluid passage and between the inlet port and the outlet port, with the portion of the fluid passage between the inlet port and the valve disc forming an upstream portion of the fluid passage and the portion of the fluid passage between the valve disc and the outlet port forming a downstream portion of the fluid passage.

[0024] The check valve can be oriented such that the valve disc is in a first closed position, thereby forming a primary seal. The valve disc can be in the first closed position when there is no fluid moving through the fluid passage or when the cracking pressure of the check valve is not exceeded, for example, when the pressure in the upstream portion of the fluid passage is equal to or less than the pressure in the downstream portion of the fluid passage. The valve disc can also be in the first closed position when the pressure in the downstream portion of the fluid passage is equal to or greater than the pressure in the upstream portion of the fluid passage.

[0025] In some cases, particulates or debris may become lodged within the check valve, such as between the disc and the first sealing surface, preventing the primary seal from fully forming and allowing leakage between the upstream and downstream fluid portions. It is contemplated that other instances may occur in which the primary seal does not form as intended, such as deformation or damage to the disc, sealing surface, or another portion of the check valve.

[0026] If the primary seal is not formed as intended, or if the differential pressure between the upstream and downstream portions of the fluid passage exceeds a threshold, the valve disc can move to a second, closed position, thereby forming a secondary seal. In some embodiments of the present disclosure, the primary and secondary seals can be formed simultaneously.

[0027] In some embodiments, the first and second sealing surfaces are disposed along an upstream portion of the fluid passage, with the second sealing surface being disposed between the inlet port and the valve body, and the first sealing surface being disposed between the inlet port and the second sealing surface.

[0028] The disc is positioned along the fluid passageway with a first portion of the disc adjacent to the first sealing surface and a second portion of the disc adjacent to the second sealing surface. The first sealing surface is distinct from the second sealing surface, and the first portion of the disc is distinct from the second portion of the disc. Both the first sealing surface and the second sealing surface can be engaged by the disc to resist movement of fluid along the fluid passageway through the check valve.

[0029] Referring now to the figures, FIG. 1 illustrates an example of a check valve 100 in use according to aspects of the present disclosure. Check valve 100 is fluidly coupled to tubing of an intravenous (IV) set being used to deliver fluid to a patient 1. The IV set includes a medication bag 10, a drip chamber 12, tubing 14, a pump 16, and an IV catheter 18. In some embodiments, check valve 100 may be fluidly coupled to tubing 14 along a portion between medication bag 10 and pump 16 or between pump 16 and IV catheter 18. It should be understood that check valves of the present disclosure may be used for applications other than IV therapy.

[0030] 2 is a perspective view of an exploded check valve 100 according to some embodiments of the present disclosure. The check valve 100 includes a valve disc 102, an upper housing 104, and a lower housing 106. The check valve 100 is configured such that the valve disc 102 is disposed between the upper housing 104 and the lower housing 106. In some embodiments, the upper housing 104 forms at least a portion of an upstream fluid passage, and the lower housing 106 forms at least a portion of a downstream fluid passage.

[0031] The radial centers of the valve body 102 , the upper housing 104 , and the lower housing 106 define an axis X 1 through the check valve 100 .

[0032] The valve disc 102 includes a top surface 120 and a bottom surface 122. The valve may also include segments or portions, such as a first portion 124 that is proximal to the center of the valve disc 102 (e.g., axis X1), and a second portion 126 that may be disposed radially outward relative to the first portion 124. In some embodiments, the valve disc includes a third portion 128 that may be disposed radially inward relative to the first portion 124, such that the first portion of the valve is disposed between the second portion 126 and the third portion 128. In some aspects of the present disclosure, any of the first portion 124, second portion 126, and third portion 128 may be disposed along the bottom surface 122 of the valve disc.

[0033] 3, a cross-sectional view of a check valve 100 according to some embodiments of the present disclosure is shown. An upper housing 104 and a lower housing 106 are coupled together to form a check valve cavity 112 therebetween. A fluid passage extends through cavity 112. A valve body 102 separates the fluid passage into an upstream fluid passage portion 108 and a downstream fluid passage portion 110.

[0034] The check valve 100 includes a first sealing surface and a second sealing surface in an upstream portion of the fluid passageway. The first sealing surface and the second sealing surface are configured to be engaged by the valve body 102 in response to pressure or movement of fluid within the check valve 100. The first sealing surface can be defined by a first sealing ridge 130, and the second sealing surface can be defined by a second sealing ridge 132. The check valve 100 can also include a valve support structure in the downstream portion 110 of the fluid passageway. The valve support structure can be defined by a valve support 160 in the downstream portion of the fluid passageway.

[0035] The valve disc 102 is seated between the first seal ridge 130 and the second seal ridge 132 in the upstream portion of the fluid passageway and is seated against the valve support 160 in the downstream portion of the fluid passageway.

[0036] While this disclosure includes reference to upper and lower housings 104, 106, it should be understood that either of first and second seal ridges 130, 132, and valve support 160 can be formed as part of another structure adjacent to valve disc 102. For example, first and second seal ridges 130, 132 can be formed as components disposed within a fluid path and adjacent to valve disc 102. First and second seal ridges 130, 132, and valve support 160 can be associated with a fluid path of a device such as a pump or within a ventricle. In another example, first and second seal ridges 130, 132, and valve support 160 can be formed as part of a surface within a device such as a pump.

[0037] 2 and 3, the valve disc 102 can be shaped as a disk having a top surface 120 and a bottom surface 122. The valve disc 102 can have a curved or bowl shape, with at least a portion of the top surface 120 being convex and at least a portion of the bottom surface 122 being concave. In some embodiments, at least a portion of the valve disc 102 is flat.

[0038] The valve disc 102 is positioned within the cavity 112 with the bottom surface 122 of the valve disc engaged against the valve support 160 and the top surface 120 of the valve disc engaged against the first sealing surface.

[0039] The disc may be defined by a convex upper surface 120 having a radius R1 selected such that when the disc 102 is positioned within the cavity 112, a first portion 124 of the disc engages against a first sealing ridge 130 and a second portion 126 of the disc is spaced from a second sealing ridge 132.

[0040] In some embodiments of the present disclosure, the valve body 102 is positioned within the cavity 112 with the first portion 124 of the valve body spaced apart from the first seal ridge 130 and the second portion 126 of the valve body engaged against the second seal ridge 132.

[0041] The valve disc 102 can include a flexible material relative to the upper and lower housings 104, 106. In some embodiments of the present disclosure, the valve disc 102 includes a first segment and a second segment, with the second segment being more flexible relative to the first segment. For example, the first segment of the valve disc 102 can include a portion of the valve configured to engage with the valve support 160 (e.g., the third disc portion 128), and the second portion of the valve disc 102 can include a portion of the valve configured to engage with the first and second seal ridges 130, 132 (e.g., the first and second disc portions 124, 126). In embodiments of the present disclosure, the first valve segment can include a rib extending radially outward from the bottom surface or axis of the disc. In yet another embodiment of the present disclosure, the first valve segment can include a ring extending around the circumference of the valve disc 102.

[0042] The valve disc 102 can be configured to be in a partially bent or biased orientation when disposed within the cavity 112 defined by the upper and lower housings 104, 106. For example, the valve disc 102 can be biased when seated between the first seal ridge 130 and the valve support 160.

[0043] The upper housing 104 and the lower housing 106 can be coupled together to define an upstream portion 108 and a downstream portion 110 of a fluid passageway that can direct fluid through the check valve 100. Additionally, the upper housing 104 and the lower housing 106 can resist unintended movement of the valve disc 102 relative to portions of the upper housing 104 and the lower housing 106. In some embodiments of the present disclosure, the check valve 100 can include a unitary or integral housing, or a housing having one or more portions coupled or formed together.

[0044] 3-6 show a check valve 100 having an upper housing 104 and a lower housing 106 coupled together to define a cavity 112 and upstream and downstream portions 108, 110 of a fluid passageway.

[0045] 4 includes a body defining a central axis X2, a radial wall 142, and a side wall 144. The radial wall 142 extends in a direction transverse to the axis X2, and the side wall 144 extends from the radial wall 144 in a direction generally parallel to the axis X2.

[0046] At least a portion of the inner surfaces of the radial wall 142 and the side wall 144 define an upper housing cavity 146. When the upper housing 104 and the lower housing 106 are coupled together, the upper housing cavity 146 and a portion of the lower housing 106 define a check valve cavity 112.

[0047] The upper housing 104 may include a first port 148 that defines an opening that extends through the radial wall 142. The first port 148 forms a fluid inlet to the upper housing cavity 146. In some embodiments, a portion of the inner surface of the radial wall 142 and the first port 148 are concave or extend away from the upper housing cavity 146.

[0048] The upper housing 104 may also include a sleeve 150 configured to couple with a portion of the tubing. The sleeve 150 extends from the radial wall 142 in a direction away from the upper housing cavity 146 and generally parallel to the axis X2. The inner surface of the sleeve 150 and the first port 148 define a passageway extending between the outer surface of the upper housing 104 and the upper housing cavity 146. The upstream portion 108 of the fluid passageway may extend through the sleeve 150, the first port 148, and the upper housing cavity 146.

[0049] According to some embodiments, the upper housing may include at least one axially extending wall 152 that projects radially inward from the inner surface of the radial wall 142 and / or the sleeve 150. The at least one wall 152 may be configured as a protruding surface disposed directly above or upstream of the disc 102. The at least one wall 152 may project radially inward from a recess in the inner surface defined by the radial wall 142, the sleeve 150, and the first port 148. The at least one wall 152 resists movement of the disc 102 from the upper housing cavity 146 toward the first port 148 when excessive backpressure is applied to the check valve 100. For example, excessive backpressure on the disc 102 may cause the disc 102 to flex or bend to the extent that the disc 102 is disengaged from its seated position between the valve support 160 and the first seal ridge 130. If the valve disc 102 becomes dislodged from its seated position, the valve disc 102 may move through the first port 148, thereby blocking the upstream portion 108 of the fluid passageway and preventing the check valve 100 from functioning as intended.

[0050] Thus, if excessive back pressure is applied within the check valve 100, the disc 102 can move toward the first port 148 until the disc 102 engages against at least one wall 152. Once the disc 102 engages against at least one wall 152, further movement of the disc 102 toward the first port 148 is resisted.

[0051] The upper housing 104 may also define a first sealing surface and a second sealing surface of the valve disc 102. The first sealing surface and the second sealing surface are formed by a first sealing ridge 130 and a second sealing ridge 132, respectively. Each of the first sealing ridge 130 and the second sealing ridge 132 is configured to be engaged by the valve disc 102.

[0052] The first seal ridge 130 and the second seal ridge 132 extend from the radial wall 142 into the upper housing cavity 146. The first seal ridge 130 and the second seal ridge 132 have perimeters that extend around the upstream portion 108 of the fluid passage. The perimeters of the first seal ridge 130 and the second seal ridge 132 are shaped as circles that extend around the first port 148. However, the perimeters of either the first seal ridge 130 or the second seal ridge 132 can have a regular shape, such as an oval, square, rectangle, or triangle, and / or an irregular shape, such as an irregular polygon. In some embodiments of the present disclosure, the first seal ridge 130 has a different perimeter shape than the second seal ridge 132.

[0053] The periphery of the first seal ridge 130 extends around the axis X2 of the upper housing 104, and the second seal ridge 132 extends around the first seal ridge 130. The periphery of the second seal ridge 132 is disposed radially outward from the first seal ridge 130 relative to the axis X2. Thus, the first seal ridge 130 is disposed between the upstream portion 108 of the fluid passage and the second seal ridge 132.

[0054] Referring to FIG. 5, a cross-sectional view of the check valve 100 taken along line 5-5 is shown. The check valve 100 is shown without the valve body 102 to better visualize the first seal ridge 130 and the second seal ridge 132. The first seal ridge 130 has a length 182 that extends from the inner surface of the radial wall 142 to an apex 184 of the first seal ridge. The first seal ridge 130 also has a width 186 that tapers away from the inner surface of the radial wall 142 toward the apex 184. In some embodiments of the present disclosure, the width 186 of the first seal ridge 130 tapers at a first angle from the inner surface of the radial wall 142 toward the apex 184 along a first segment and tapers at a second angle from the first segment to the apex 184, the second angle being greater than the first angle.

[0055] In some embodiments of the present disclosure, first seal ridge 130 has an inner surface 188 that extends from the inner surface of radial wall 142 in a direction parallel to axis X2 and an outer surface 189 that extends from the inner surface of radial wall 142 in a direction that is transverse to inner surface 188. Inner surface 188 and outer surface 189 of first seal ridge 130 intersect at first seal ridge apex 184.

[0056] Second seal ridge 132 has a length 192 that extends from the inner surface of radial wall 142 to first seal ridge apex 194. Second seal ridge 132 also has a width 196 that tapers away from the inner surface of radial wall 142 toward apex 194. In some embodiments of the present disclosure, width 196 of second seal ridge 132 tapers at a first angle along a first segment from the inner surface of radial wall 142 toward apex 196 and tapers at a second angle from the first segment to apex 194, the second angle being greater than the first angle.

[0057] In some embodiments of the present disclosure, second seal ridge 132 has an inner surface 198 that extends from the inner surface of radial wall 142 in a direction parallel to axis X2 and an outer surface 199 that extends from the inner surface of radial wall 142 in a direction that is transverse to inner surface 198. Inner surface 198 and outer surface 199 of second seal ridge 132 intersect at second seal ridge apex 194.

[0058] The apex 184 of the first seal ridge 130 defines a first diameter D1, and the apex 194 of the second seal ridge 132 defines a second diameter D2. The second diameter D2 is larger than the first diameter D1 such that the second seal ridge 132 is disposed radially outward from the first seal ridge 130. The second diameter D2 can be larger than the first diameter D1 such that the inner surface 198 of the second seal ridge is spaced from the outer surface 189 of the first seal ridge.

[0059] A channel may be formed between the first seal ridge 130 and the second seal ridge 132. In some aspects of the present disclosure, a portion of the inner surface of the radial wall 142 extends between the first seal ridge 130 and the second seal ridge 132 to form the channel. In some embodiments of the present disclosure, the first seal ridge 130 and the second seal ridge 132 may be formed by one or more channels extending on the inner surface of the radial wall 142.

[0060] 6 includes a body defining a central axis X3, a radial wall 162, and a side wall 164. The radial wall 162 extends in a direction transverse to the axis X3, and the side wall 164 extends from the radial wall 164 in a direction generally parallel to the axis X3.

[0061] At least a portion of the inner surfaces of the radial wall 162 and the side wall 164 define a lower housing cavity 166. When the upper and lower housings 104, 106 are coupled together, the lower housing cavity 166 and a portion of the upper housing 104 define the check valve cavity 112.

[0062] The lower housing 106 may include a second port 168 that defines an opening that extends through the radial wall 162. The second port 168 provides a fluid outlet from the lower housing cavity 166. In some embodiments, a portion of the inner surface of the radial wall 162 and the second port 168 are concave or extend away from the lower housing cavity 166.

[0063] The lower housing 106 may also include a sleeve 170 configured to couple with a portion of the tubing. The sleeve 170 extends from the radial wall 162 in a direction away from the lower housing cavity 166 and generally parallel to the axis X3. The inner surface of the sleeve 170 and the second port 168 define a passageway extending between the outer surface of the lower housing 106 and the lower housing cavity 166. The downstream portion 110 of the fluid passageway extends through the sleeve 170, the second port 168, and the lower housing cavity 166.

[0064] According to some embodiments, the check valve 100 can optionally include a valve support 160 configured to engage a portion of the disc 102 to retain the disc within the check valve 100. The valve support 160 can also resist movement of the disc 102 toward the downstream portion 110 of the fluid passageway or out of the cavity 112.

[0065] In some embodiments of the present disclosure, the valve support 160 is part of the lower housing 106. The valve support 160 can engage and resist movement of the valve disc 102 in a direction from the lower housing cavity 166 toward the second port 168 as fluid flow moves from the upstream fluid passage portion 108 to the downstream fluid passage portion 110.

[0066] The valve support 160 extends into the lower housing cavity 166 and is positioned below or downstream from the valve disc 102. The valve support 160 may include a base portion and a distal end portion. The base portion of the valve support 160 is coupled to the lower housing 106, and the distal end portion defines a valve support surface 172. The valve support surface 172 is configured to engage the bottom surface 122 of the valve disc 102 along the disc third portion 128.

[0067] According to some embodiments, the lower housing may include at least one arm 174 projecting radially inward from the inner surface of the radial wall 162. The at least one arm 172 may be configured as a protrusion extending between the lower housing 106 and the valve support 160. In some embodiments of the present disclosure, the check valve 100 includes two arms 174 extending in radially opposite directions from a recess in the inner surface defined by the radial wall 162 to the valve support 160. The two arms 174 position the valve support 160 in the downstream portion 110 of the fluid passageway. In some embodiments, the valve support extends along the axis X3.

[0068] The valve support 160 can have a width 176 that tapers away from the inner surface of the radial wall 162 toward the valve support surface 172. When the upper housing 104 and the lower housing 106 are coupled together, the distance 178 between the valve support surface 172 and the inner surface of the radial wall 142 is greater than the length 182 of the first seal ridge and the length 192 of the second seal ridge. In some embodiments of the present disclosure, the distance 178 between the valve support surface 172 and the inner surface of the radial wall 142 is approximately equal to the length 192 of the second seal ridge such that a plane defined by the valve support surface 172 intersects a plane defined by the apex 194 of the second seal ridge.

[0069] The check valve 100 is assembled as shown in Figures 2 and 3. To assemble the check valve 100, the upper housing 104 and the lower housing 106 are coupled together with the valve disc 102 therebetween. Prior to coupling the upper housing 104 and the lower housing 106, the valve disc 102 is placed in contact with either the first seal ridge 130 or the second seal ridge 132 of the upper housing 104 or the valve support 160 of the lower housing 106. The upper housing 104 and the lower housing 106 are then moved toward each other so that the cavity 146 of the upper housing and the cavity 166 of the lower housing define the cavity 112 of the check valve.

[0070] In some embodiments of the present disclosure, when check valve 100 is assembled, axis X2 of upper housing 104 and axis X3 of lower housing 106 are aligned with axis X1 through check valve 100.

[0071] When the upper housing 104 and the lower housing 106 are coupled together, the bottom surface 122 of the disc is engaged against the valve support 160 and the top surface 120 of the disc is engaged against the first seal ridge 130. More specifically, the disc can be positioned within the cavity 112 with the first portion 124 of the disc engaged against the first seal ridge 130 and the third portion 128 of the disc engaged against the valve support surface 174.

[0072] The valve body 102 can be formed as a disk with an upper surface having a radius R1 such that when the upper housing 104 and the lower housing 106 are joined together, the first portion 124 of the valve body engages against the top 184 of the first seal ridge and the second portion 126 of the valve body is spaced from the top 194 of the second seal ridge.

[0073] In some embodiments of the present disclosure, the valve disc 102, or a portion thereof, can have a generally flat disk shape such that when the upper and lower housings 104, 106 are joined together, the valve disc 102 is biased or bent between the top 184 of the first seal ridge and the valve support surface 174.

[0074] The valve disc 102, or portions thereof, is flexible or movable such that the first portion 124 of the valve disc is movable toward or away from the first sealing ridge 130 and toward or away from the second sealing ridge 132.

[0075] 3 shows the check valve 100 with the valve disc 102 in a first closed position. The valve disc 102 can be in the first closed position when no fluid is moving through the check valve 100 or when the difference in fluid pressure between the upstream portion 108 and the downstream portion 110 of the fluid passage is less than or equal to the cracking pressure of the check valve 100. For example, the valve disc 102 can be in the first closed position when the fluid pressure in the upstream portion 108 of the fluid passage is a first pressure and the fluid pressure in the downstream portion 110 of the fluid passage is a second pressure, and the first pressure and the second pressure are approximately equal. In another example, the valve disc 102 can be in the first closed position when the second pressure is greater than the first pressure.

[0076] In the first closed position, the distance between the first sealing ridge 130 and the first portion 124 of the valve disc is less than the distance between the second sealing ridge 132 and the second portion 126 of the valve disc.

[0077] 7, a cross-sectional view of check valve 100 taken along line 5-5 is shown. Check valve 100 is shown with valve disc 102 in the open position. Valve disc 102 can be in the open position when fluid moves from upstream portion 108 of the fluid passageway to downstream portion 110 of the fluid passageway or when the cracking pressure of check valve 100 is exceeded. For example, valve disc 102 can be in the open position when fluid pressure in upstream portion 108 of the fluid passageway is greater than fluid pressure in downstream portion 110 of the fluid passageway.

[0078] In the open position, portions of the valve disc 102, including the first portion 124 and the second portion 126, are spaced apart from the first ridge 130 and the second ridge 132, respectively. In the open position, fluid can travel between the valve disc 102 and the first ridge 130 and the second ridge 132 from the upstream portion 108 of the fluid passage to the downstream portion 110 of the fluid passage.

[0079] When the valve body 102 moves from the first closed position to the open position, at least a portion of the valve body 102 is bent or biased such that the distance between the first sealing ridge 130 and the first portion 124 of the valve body is greater than the distance between the first sealing ridge 130 and the first portion 124 of the valve body.

[0080] Referring to FIG. 8 , a cross-sectional view of the check valve 100 taken along line 8-8 is shown. The check valve 100 is shown with the disc 102 in the second, closed position. The disc 102 can move to the second, closed position when particulates or debris 200 locate the check valve, preventing the primary seal from being formed by engagement of the disc 102 with the first seal ridge 130. As shown, the debris 200 is attached to the interface between the first seal ridge 130 and the disc first portion 124. The debris 200 prevents the disc first portion 124 from engaging the entire periphery of the first seal ridge apex 184, thereby allowing fluid to migrate or leak from the downstream fluid passageway portion 110 to the upstream fluid passageway portion 108. If the primary seal does not form as intended, due to debris 200 or another cause, the pressure differential between the upstream and downstream portions 108, 110 of the fluid passageway will cause the second portion 126 of the valve body to move toward and engage the second seal ridge 132, thereby forming a secondary or backup seal.

[0081] In some aspects of the present disclosure, the valve disc 102 moves to the second, closed position when the fluid pressure in the downstream portion 110 of the fluid passage is at a third pressure that is greater than the first pressure and the second pressure.

[0082] By providing a first sealing surface and a second sealing surface, the check valve 100 of the present disclosure can form a primary seal when the valve disc 102 is in the first closed position and a backup or secondary seal when the valve disc 102 is in the second closed position. Thus, the check valve 100 of the present disclosure prevents backflow leakage of fluid through the check valve, improves the reliability of the check valve, simplifies the manufacture of the check valve, and improves the assembly efficiency of the check valve.

[0083] Examples of the subject technology The subject technology is exemplified according to various aspects, for example, as described below. Various examples of aspects of the subject technology are described as numbered clauses (1, 2, 3, etc.) for convenience. These are provided as examples and are not intended to limit the subject technology. Note that any of the dependent clauses can be combined in any combination and placed within their respective independent clauses (e.g., clause 1 or clause 5). Other clauses can be presented in a similar manner.

[0084] (Clause 1) A check valve comprising: a housing having an internal cavity, a first port, and a second port, wherein an upstream fluid passage extends through the first port to the internal cavity and a downstream fluid passage extends through the second port to the internal cavity; a first seal ridge extending into the internal cavity and including a periphery extending around the first port; a second seal ridge extending into the internal cavity, the second seal ridge including a periphery extending around the upstream fluid passage such that the first seal ridge is between the first port and the second seal ridge; a valve support having a valve support surface; and a valve body disposed in the internal cavity, the valve body having a first portion movable relative to the first seal ridge, a second portion movable relative to the second seal ridge, and a third portion engaged with the valve support surface.

[0085] (Clause 2) A check valve as described in Clause 1, wherein the periphery of the first sealing ridge includes a first diameter and the periphery of the second sealing ridge includes a second diameter, the second diameter being larger than the first diameter.

[0086] (Clause 3) A check valve according to clause 1 or 2, wherein the distance between the first sealing ridge and the first portion of the valve body is smaller than the distance between the second sealing ridge and the second portion of the valve body.

[0087] (Clause 4) A check valve described in any one of Clauses 1 to 3, wherein the first sealing ridge includes a length extending toward the first portion of the valve body, and the second sealing ridge includes a length extending toward the second portion of the valve body, and the length of the second sealing ridge is longer than the length of the first ridge.

[0088] (Clause 5) The check valve of Clause 4, wherein both the first sealing ridge and the second sealing ridge include a width that tapers along the length thereof.

[0089] (Clause 6) The check valve according to Clause 5, wherein the widths of both the first seal ridge and the second seal ridge taper away from the housing.

[0090] (Clause 7) A check valve described in any one of Clauses 1 to 6, wherein at least a portion of the valve body is flexible, and the first and second portions of the valve body are configured to move toward and away from the first and second sealing ridges, respectively.

[0091] (Clause 8) A check valve according to any one of Clauses 1 to 7, wherein the valve body includes a disk shape having an upper surface and a lower surface, the upper surface including the first and second portions of the valve body, and the lower surface including the third portion of the valve body.

[0092] (Clause 9) The check valve according to Clause 8, wherein at least a portion of the top surface includes a convex surface and at least a portion of the bottom surface includes a concave surface.

[0093] (Clause 10) The check valve according to any one of clauses 1 to 9, further comprising a wall portion extending into the upstream fluid passage and resisting movement of the valve element out of the internal cavity.

[0094] 11. The check valve of claim 10, wherein the wall extends from the housing into the upstream fluid passage.

[0095] (Clause 12) A check valve described in any one of Clauses 1 to 11, wherein the plane defined by the top of the second sealing ridge is between the plane defined by the top of the first sealing ridge and the plane defined by the valve support surface.

[0096] (Clause 13) A check valve described in any one of Clauses 1 to 12, wherein the plane defined by the top of the second sealing ridge is spaced apart from the plane defined by the top of the first sealing ridge.

[0097] (Clause 14) A housing having an internal cavity, a first port, and a second port, wherein an upstream fluid passage extends through the first port to the internal cavity and a downstream fluid passage extends through the second port to the internal cavity; a first seal ridge extending into the internal cavity and including a periphery extending around the first port; and a second seal ridge extending into the internal cavity, the second seal ridge including a periphery extending around the upstream fluid passage such that the first seal ridge is between the first port and the second seal ridge. 1. A check valve comprising: a valve disc disposed within the internal cavity, the valve disc having a first closed position in which a first portion of the valve disc is engaged against a first seal ridge and a second portion of the valve disc is spaced from the second seal ridge; an open position in which the first and second portions of the valve disc are spaced from the first and second seal ridges, respectively; and a second closed position in which at least a portion of the first portion of the valve disc is engaged against the first seal ridge and the second portion of the valve disc is engaged against the second seal ridge.

[0098] (Clause 15) A check valve as described in Clause 14, wherein the valve element is in the first closed position when (i) the fluid pressure in the upstream fluid passage is a first pressure, the fluid pressure in the downstream fluid passage is a second pressure, and the first pressure and the second pressure are approximately equal, and (ii) the second pressure is greater than the first pressure.

[0099] (Clause 16) The check valve according to Clause 15, wherein the valve element is in the second closed position when the fluid pressure in the downstream fluid passage is a third pressure greater than the first pressure and the second pressure.

[0100] (Clause 17) The check valve according to Clause 15, wherein the valve element is in an open position when the first pressure is greater than the second pressure.

[0101] (Clause 18) A check valve described in any one of Clauses 14 to 17, wherein at least a portion of the valve body is flexible, and in the open position, a first portion of the valve body is biased away from the first sealing ridge.

[0102] (Clause 19) The check valve according to Clause 18, wherein in the second closed position, the second portion of the valve body is biased toward the second sealing ridge.

[0103] (Clause 20) A method of controlling flow, comprising the steps of: providing a check valve defining an internal cavity having a fluid passageway extending therethrough, a first seal ridge, and a second seal ridge; and providing a valve body within the internal cavity in a first closed position, wherein a first portion of the valve body is engaged against the first seal ridge and a second portion of the valve body is spaced from the second seal ridge to resist movement of fluid between upstream and downstream portions of the fluid passageway, the valve body being movable to a second closed position such that at least a portion of the first portion of the valve body is engaged against the first seal ridge and the second portion of the valve body moves toward and engages the second seal ridge.

[0104] (Clause 21) The method described in Clause 20, wherein the valve is movable to an open configuration, and the first and second portions of the valve are spaced apart from the first and second sealing ridges, respectively, to allow fluid to move between the upstream and downstream portions of the fluid passage.

[0105] (Clause 22) The method of clause 20 or 21, wherein the step of providing a valve within the internal cavity includes the step of disposing the valve between the valve support and the first and second sealing ridges.

[0106] Other considerations In some embodiments, any clause herein may be dependent on any of the independent clauses or any of the dependent clauses. In one aspect, any clause (e.g., a dependent clause or an independent clause) may be combined with any other clause or clauses (e.g., a dependent clause or an independent clause). In one aspect, a claim may include some or all of the words (e.g., steps, operations, means, or components) recited in a clause, sentence, phrase, or paragraph. In one aspect, a claim may include some or all of the words recited in one or more clauses, sentences, phrases, or paragraphs. In one aspect, some of the words in each clause, sentence, phrase, or paragraph may be deleted. In one aspect, additional words or elements may be added to a clause, sentence, phrase, or paragraph. In one aspect, the subject technology may be implemented without utilizing some of the components, elements, functions, or operations described herein. In one aspect, the subject technology may be implemented using additional components, elements, functions, or operations.

[0107] This disclosure is provided to enable those skilled in the art to practice the various aspects described herein. This disclosure provides various examples of the subject technology, and the subject technology is not limited to these examples. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects.

[0108] Reference to a singular element is intended to mean "one or more" and not "one and only one" unless otherwise specified. The term "some" refers to one or more unless otherwise specified. Masculine pronouns (e.g., his) include feminine and neuter forms (e.g., her and its), and vice versa. Headings and subheadings, if any, are used for convenience only and are not intended to limit the invention.

[0109] The word "exemplary" is used herein to mean "serving as an example or illustration." Any aspect or design described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other aspects or designs. In one aspect, various alternative configurations and operations described herein can be considered at least equivalent.

[0110] The use of a phrase such as "aspect" does not imply that such aspect is essential to the subject technology or that such aspect applies to all configurations of the subject technology. Disclosure of one aspect may apply to all configurations, or to one or more configurations. An aspect may provide one or more examples. A phrase such as an aspect may refer to one or more aspects, and vice versa. A phrase such as "embodiment" does not imply that such embodiment is essential to the subject technology or that such embodiment applies to all configurations of the subject technology. Disclosure of one embodiment may apply to all embodiments, or to one or more embodiments. An embodiment may provide one or more examples. A phrase such as an embodiment may refer to one or more embodiments, and vice versa. A phrase such as "configuration" does not imply that such configuration is essential to the subject technology or that such configuration applies to all configurations of the subject technology. Disclosure of a configuration may apply to all configurations, or to one or more configurations. A configuration may provide one or more examples. A phrase such as an embodiment may refer to one or more configurations, and vice versa.

[0111] In one aspect, unless otherwise stated, all measurements, values, ratings, locations, dimensions, sizes, and other specifications set forth herein, including the following claims, are approximate and not exact, and are intended to have a reasonable range consistent with the function to which they relate and that which is customary in the art to which they pertain.

[0112] In one aspect, the term "coupled" or the like may refer to being directly coupled. In another aspect, the term "coupled" or the like may refer to being indirectly coupled.

[0113] For example, terms such as "upper," "lower," "front," and "rear," as used in this disclosure, should be understood to refer to any coordinate system, rather than the typical gravitational coordinate system. Thus, upper, lower, front, and rear surfaces can extend upward, downward, diagonally, or horizontally in the gravitational coordinate system.

[0114] Various items may be arranged in different ways (e.g., placed in a different order or divided differently) without departing from the scope of the subject technology at large. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known, or that later become known, to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Furthermore, nothing disclosed herein is intended to be made available to the public, regardless of whether such disclosure is expressly recited in the claims. A claim element is not to be construed under the provisions of 35 U.S.C. § 112, sixth paragraph, unless the element is expressly recited using the phrase "means for" or, in the case of a method claim, using the phrase "step for." Furthermore, to the extent terms such as "include," "have," and the like are used, such terms are intended to be inclusive in the same manner as "comprise" when interpreted as a transitional term in a claim.

[0115] The title, background, summary, brief description of the drawings, and abstract of this disclosure are incorporated into this disclosure and are provided as illustrative examples of the disclosure, not as a limiting description. They are submitted with the understanding that they will not be used to limit the scope or meaning of the claims. It will also be appreciated that the detailed description provides illustrative examples and that various configurations are grouped together in various embodiments for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed subject matter requires more configurations than are expressly recited in each claim. Rather, as the following claims reflect, inventive subject matter lies in less than all configurations of a single disclosed configuration or operation. The following claims are incorporated into the detailed description, with each claim standing on its own as separately claimed subject matter.

[0116] The claims are not intended to be limited to the embodiments described herein but are to be accorded the full scope consistent with the claims as literal, including all legal equivalents. Nevertheless, no claim is intended, and should not be construed, to cover subject matter that does not satisfy the requirements of 35 U.S.C. §§101, 102, or 103.

Claims

1. In a check valve, a housing having an internal cavity, a first port, and a second port, wherein an upstream fluid passage extends through the first port to the internal cavity and a downstream fluid passage extends through the second port to the internal cavity; a first sealing ridge extending into the internal cavity and including a periphery extending around the first port; a second seal ridge extending into the internal cavity, the second seal ridge including a periphery extending around the upstream fluid passage such that the first seal ridge is between the first port and the second seal ridge; a valve support having a valve support surface; a valve disc disposed within the internal cavity, the valve disc comprising a first portion movable relative to the first seal ridge, a second portion movable relative to the second seal ridge, and a third portion engaged against the valve support surface; A check valve comprising:

2. 2. The check valve of claim 1, wherein the periphery of the first sealing ridge has a first diameter and the periphery of the second sealing ridge has a second diameter, the second diameter being larger than the first diameter.

3. 2. The check valve of claim 1, wherein a distance between the first sealing ridge and the first portion of the valve body is less than a distance between the second sealing ridge and the second portion of the valve body.

4. 2. The check valve of claim 1, wherein the first seal ridge has a length extending toward the first portion of the valve body, the second seal ridge has a length extending toward the second portion of the valve body, and the length of the second seal ridge is longer than the length of the first seal ridge.

5. The check valve of claim 4 , wherein both the first sealing ridge and the second sealing ridge have a width that tapers along the length thereof.

6. The check valve of claim 5 , wherein the width of both the first sealing ridge and the second sealing ridge tapers away from the housing.

7. 2. The check valve of claim 1, wherein at least a portion of the valve disc is flexible, and the first and second portions of the valve disc are configured to move toward and away from the first and second sealing ridges, respectively.

8. 2. The check valve of claim 1, wherein the valve body includes a disk shape having a top surface and a bottom surface, the top surface including the first portion and the second portion of the valve body, and the bottom surface including the third portion of the valve body.

9. The check valve of claim 8 , wherein at least a portion of the top surface comprises a convex surface and at least a portion of the bottom surface comprises a concave surface.

10. The check valve of claim 1 , further comprising a wall extending into the upstream fluid passageway to resist movement of the valve disc out of the internal cavity.

11. The check valve of claim 10 , wherein the wall extends from the housing into the upstream fluid passage.

12. 2. The check valve of claim 1, wherein a plane defined by a top of the second sealing ridge is between a plane defined by a top of the first sealing ridge and a plane defined by the valve support surface.

13. 2. The check valve of claim 1, wherein a plane defined by a peak of the second sealing ridge is spaced apart from a plane defined by a peak of the first sealing ridge.

14. In a check valve, a housing having an internal cavity, a first port, and a second port, wherein an upstream fluid passage extends through the first port to the internal cavity and a downstream fluid passage extends through the second port to the internal cavity; a first sealing ridge extending into the internal cavity and including a periphery extending around the first port; a second seal ridge extending into the internal cavity, the second seal ridge including a periphery extending around the upstream fluid passage such that the first seal ridge is between the first port and the second seal ridge; a valve disc disposed within the internal cavity, the valve disc including: a first closed position in which a first portion of the disc is engaged against the first seal ridge and a second portion of the disc is spaced from the second seal ridge; an open position in which the first and second portions of the disc are spaced from the first and second seal ridges, respectively; and a second closed position in which at least a portion of the first portion of the disc is engaged against the first seal ridge and the second portion of the disc is engaged against the second seal ridge; A check valve comprising:

15. 15. The check valve of claim 14, wherein the valve element is in a first closed position when: (i) a fluid pressure in the upstream fluid passage is a first pressure, a fluid pressure in the downstream fluid passage is a second pressure, and the first pressure and the second pressure are approximately equal; and (ii) the second pressure is greater than the first pressure.

16. 16. The check valve of claim 15, wherein the valve disc is in the second closed position when the fluid pressure in the downstream fluid passage is at a third pressure greater than the first pressure and the second pressure.

17. 16. The check valve of claim 15, wherein the valve disc is in the open position when the first pressure is greater than the second pressure.

18. 15. The check valve of claim 14, wherein at least a portion of the disc is flexible, and in the open position, the first portion of the disc is biased away from the first sealing ridge.

19. 19. The check valve of claim 18, wherein in the second closed position, the second portion of the valve disc is biased toward the second sealing ridge.

20. 1. A method of controlling flow, comprising: providing a check valve defining an interior cavity having a fluid passageway extending therethrough, a first sealing ridge, and a second sealing ridge; providing a valve disc within the internal cavity in a first closed position, a first portion of the valve disc engaged against the first sealing ridge and a second portion of the valve disc spaced from the second sealing ridge to resist movement of fluid between an upstream portion and a downstream portion of the fluid passage; the valve disc is movable to a second, closed position such that at least a portion of the first portion of the valve disc is engaged against the first sealing ridge and the second portion of the valve disc moves toward and engages the second sealing ridge.

21. 21. The method of claim 20, wherein the valve is movable to an open configuration, and the first and second portions of the valve are spaced apart from the first and second sealing ridges, respectively, to allow fluid to move between the upstream and downstream portions of the fluid passage.

22. 21. The method of claim 20, wherein providing a valve within the internal cavity comprises disposing the valve between a valve support and the first and second sealing ridges.

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