Bidirectional overflow valve and overflow valve

Abstract

The utility model relates to a bidirectional overflow valve and an overflow valve. The bi-directional overflow valve is used to automatically stop delivery of fluid from a supply source in a fluid network. The valve has a housing defining an interior that forms a fluid passage along a flow axis between a first opening and a second opening. The valve also has: a valve seat in the interior through which the fluid passage extends; and a first shut-off element and a second shut-off element, the first shut-off element and the second shut-off element being disposed on opposite sides of the valve seat. The shut-off element is disposed apart from the valve seat assembly in an open position to allow fluid to pass through the fluid passage. In a closed position, the first shut-off element and the second shut-off element are configured to move against the valve element assembly to close the fluid passage when flow through the fluid passage exceeds a predetermined level.

Description

TECHNICAL FIELD

[0001] The present subject disclosure relates to bidirectional over-flow valves. BACKGROUND

[0002] In the field of over-flow valves, the current state of the art is characterized by the ubiquitous use of one-way valves. These valves play a vital role in fluid delivery systems, particularly in scenarios where a sudden increase in flow can mean a dangerous rupture or breach. However, the inherent limitation of existing over-flow valves is indeed their one-way nature. Traditionally, these valves are designed to permit flow in only one direction, thereby providing protection against over-discharge of fluid. However, this one-way characteristic presents a challenge in applications where bidirectional flow can be required or expected. SUMMARY

[0003] One issue in the related art revolves around the desire to provide over-flow valves that can be connected from either end. The present disclosure aims to build upon the existing technology, introducing a novel bidirectional over-flow valve design specifically tailored for applications such as natural gas systems, ensuring safety and operational efficiency.

[0004] Recognizing the broader context of fluid delivery systems, there is an increasing emphasis on the necessity to simplify the manufacturing of over-flow valves. Efficient manufacturing processes are crucial for widespread adoption, cost-effectiveness, and seamless integration into various fluid delivery applications. The related art has attempted to simplify manufacturing techniques, thereby balancing the complexity of valve designs with the necessity of optimizing production. As the demand for enhanced safety and efficiency continues to drive innovation, the present disclosure seeks to contribute not only by addressing the bidirectional issue but also by simplifying the manufacturing of over-flow valves to improve accessibility and applicability in different fluid transportation environments.

[0005] One embodiment of the present subject technology includes a bidirectional over-flow valve for automatically stopping delivery of fluid from a supply source in a fluid network. The bidirectional over-flow valve has a housing defining an interior that forms a fluid passageway along a flow axis between a first opening and a second opening. The bidirectional over-flow valve further includes a valve seat in the interior through which the fluid passageway extends, and a valve element assembly. The valve element assembly includes a first shut-off element and a second shut-off element disposed on opposite sides of the valve seat. The first and second shut-off elements are normally biased in an open position disposed apart from the valve seat assembly to allow fluid to pass through the fluid passageway. In a first closed position, the first shut-off element is configured to move against the valve element assembly to close the fluid passageway when flow through the fluid passageway from the first opening to the second opening exceeds a first predetermined level. In a second closed position, the second shut-off element is configured to move against the valve element assembly to close the fluid passageway when flow through the fluid passageway from the second opening to the first opening exceeds a second predetermined level.

[0006] The first shut-off element can define a first convex outer surface; the second shut-off element can define a second convex outer surface; and the valve seat can define a first concave seat surface opposite a second concave seat surface, wherein the first convex outer surface faces the first concave outer surface and the second convex outer surface faces the second concave outer surface.

[0007] The valve element assembly can include a clasp mechanism configured to snap engage the first shut-off element and the second shut-off element together. The clasp mechanism can include: a first pair of opposing first deflectable arms extending from the first shut-off element, each first deflectable arm having a distal hook and an intermediate boss defining a first capture hollow adjacent the first shut-off element; and a second pair of opposing second deflectable arms extending from the second shut-off element. Each second deflectable arm can have a distal hook and an intermediate boss defining a second capture hollow adjacent the second shut-off element, such that the distal hooks of the first pair are selectively captured in the second capture hollow and the distal hooks of the second pair are selectively captured in the first capture hollow.

[0008] The first pair of arms and the second pair of arms can form a radially outward curved surface that generally forms a portion of a circle in cross-section. Further, the valve seat can include a center ring defining a center opening through which the fluid passage and the first and second pairs of arms extend. The center ring directs axial movement of the valve element assembly through the center opening that is generally the same size as the circle.

[0009] The bidirectional flow-through valve can further include: a first spring extending between the valve seat assembly and the first shut-off element to bias the first shut-off element in the open position; and a second spring extending between the valve seat assembly and the second shut-off element to bias the second shut-off element in the open position, wherein the ring acts as a stop for the first and second springs.

[0010] The valve seat can be formed of an ethylene copolymer-based material that expands at high temperatures to close the fluid passage.

[0011] One embodiment of the subject technology includes an over-flow valve for automatically stopping delivery of fluid from a supply in a fluid network. The over-flow valve includes a housing defining an interior forming a fluid passageway along a flow axis between a first opening and a second opening. The over-flow valve also includes a valve seat secured in the interior and forming a central opening with the fluid passageway extending through the central opening. Further, the over-flow valve has a valve element including a first shut-off element for selectively sealing against the valve seat to block the fluid passageway and at least two arms extending from the first shut-off element through the central opening. The at least two arms are retained in the central opening by a distal hook on each arm and are sized and configured to guide axial movement of the valve element. Further, the over-flow valve has a spring extending between the valve seat and the valve element for normally biasing the valve element away from the valve seat in an open position to allow fluid through the fluid passageway. In a first closed position, the first shut-off element is configured to move against the valve element assembly to close the fluid passageway when flow through the fluid passageway from the first opening to the second opening exceeds a first predetermined level.

[0012] In other embodiments, the valve seat can have an interior axial surface with a central ring secured therein defining the central opening and capturing the distal hooks. Further, the valve element can include a second shut-off element for selectively sealing against the valve seat to block the fluid passageway, the second shut-off element having at least two arms extending from the second shut-off element through the central opening. The at least two arms of the second shut-off element can have distal hooks for coupling to the first shut-off element and are sized and configured to guide axial movement of the valve element. Further, the over-flow valve can have a second spring extending between the valve seat and the second shut-off element for normally biasing the second shut-off element away from the valve seat in an open position to allow fluid through the fluid passageway. In a second closed position, the second shut-off element can be configured to move against the valve element assembly to close the fluid passageway when flow through the fluid passageway from the second opening to the first opening exceeds a second predetermined level.

[0013] In other embodiments, each of the arms can have a boss forming a capture hollow to snap engage the first and second shut-off elements together. The at least two arms can form a radially outward curved surface that generally forms a portion of a circle in cross-section. The valve seat can be formed of an ethylene copolymer-based material that swells at high temperatures to close the fluid passageway.

[0014] One embodiment of the subject technology includes an over-flow valve for automatically stopping delivery of fluid from a supply in a fluid network. The over-flow valve includes a housing defining an interior forming a fluid passage along a flow axis, and a valve seat secured in the interior and forming a central opening, where the fluid passage extends through the central opening. The over-flow valve includes first and second shut-off elements for selectively sealing the valve seat to block the fluid passage. The first and second shut-off elements are connected together by a clasp mechanism and held in the central opening. Further, the first and second shut-off elements are sized and configured to guide axial movement of the valve elements. The over-flow valve includes two springs extending between the valve seat and each shut-off element for normally biasing the shut-off elements away from the valve seat in an open position to allow fluid through the fluid passage. In a closed position, the first and second shut-off elements are configured to move against the valve element assembly to close the fluid passage when flow through the fluid passage exceeds a predetermined level. BRIEF DESCRIPTION OF DRAWINGS

[0015] Various aspects of the disclosure are discussed with reference to the accompanying drawings. It should be understood that the elements shown in the figures are not necessarily to scale or proportionally represented. For example, the size of some elements can be exaggerated relative to other elements for clarity. Also, several physical components can be included in one functional block or element. Furthermore, where considered appropriate, reference numerals can be repeated among the figures to indicate corresponding or analogous elements. However, for the sake of clarity, not every component can be referenced in every figure. The drawings are provided for purposes of illustration and explanation and are not intended as a definition of the limits of the disclosure.

[0016] Figure 1 A perspective view of a bi-directional over-flow valve for automatically stopping delivery of fluid from a supply in a fluid network is shown in accordance with the subject technology.

[0017] Figure 2 A partial cross-sectional side view of a bi-directional over-flow valve is shown in accordance with the subject technology.

[0018] Figure 3 An exploded view of a bi-directional over-flow valve is shown in a perspective view in accordance with the subject technology.

[0019] Figure 4A And Figure 4B A female seat portion of a housing of a bi-directional over-flow valve is shown in an independent partially transparent perspective view and cross-sectional plan view in accordance with the subject technology.

[0020] Figure 5A And Figure 5BA male portion of a housing of a bidirectional excess flow valve according to the subject technology is shown in separate perspective and cross-sectional plan views.

[0021] Figures 6A to 6C A valve seat assembly of a bidirectional excess flow valve according to the subject technology is shown in separate perspective, plan, and cross-sectional views.

[0022] Figures 7A to 7D A separate perspective, side plan, enlarged detailed side plan cross-sectional, and front plan view of a shut-off element that is part of a valve element assembly of a bidirectional excess flow valve according to the subject technology is shown.

[0023] Figure 8 A spring that serves as another component of a valve element assembly of a bidirectional excess flow valve according to the subject technology is shown in perspective view. DETAILED DESCRIPTION

[0024] The subject technology overcomes many of the prior art problems associated with excess flow valves. The advantages of the technology disclosed herein, and other features and characteristics, will become more readily apparent to those of ordinary skill in the art upon reading the following detailed description of certain example embodiments when considered in connection with the accompanying drawings, in which like reference numerals designate similar structural elements. It should be expressly understood that directional terms such as vertical, horizontal, upper, lower, right, left, front, and rear are used with reference to the accompanying drawings and that drawing orientation is merely for purposes of illustration and is not intended to be limiting.

[0025] Reference is now made to Figure 1 , a perspective view of a bidirectional excess flow valve 100 for automatically stopping the delivery of fluid from a supply in a fluid network is shown. The bidirectional excess flow valve 100 is normally open. However, the bidirectional excess flow valve 100 is configured to move to a first closed position when the flow through the bidirectional excess flow valve 100 in a first direction exceeds a first predetermined level. The bidirectional excess flow valve 100 is also configured to move to a second closed position when the flow through the bidirectional excess flow valve 100 in a second direction exceeds a second predetermined level. Thus, regardless of how the bidirectional excess flow valve 100 is installed, the bidirectional excess flow valve 100 will be used to stop flow in excess flow conditions, i.e., the bidirectional excess flow valve 100 is reversible.

[0026] The bidirectional excess flow valve 100 has a housing 102 formed from two mated first and second housing portions 104a, 104b. The first housing portion 104a (also referred to as a female seat housing portion) defines an inlet 106a for connecting to a male external connection of a fluid network (not shown) and alternatively serves as an outlet. The second housing portion 104b (also referred to as a male housing portion) defines an outlet 106b that also serves to connect to a female external connection of a fluid network and alternatively functions as an inlet. As shown, the inlet 106a and outlet 106b simply threadably engage conventional fittings.

[0027] Additionally, with reference to Figure 2 and Figure 3 , a cross-sectional plan view and exploded perspective view of a bidirectional flow-through valve 100 of the present disclosure is shown. Figure 1 When assembled, the housing 102 defines an interior 108 having a fluid passageway along a flow axis "a" between an inlet 106a and an outlet 106b. It is contemplated that the housing 102, and in particular the inlet 106a and outlet 106b, can be adapted (e.g., coupled to a fitting), reconfigured (e.g., changed from a male to a female, or vice versa), and rearranged (e.g., oriented at an angle such as 90 degrees) to be included in any desired network.

[0028] Figure 4A and Figure 4B A first housing portion 104a of the housing 102 of the bidirectional flow-through valve 100 is shown independently in perspective view and cross-sectional plan view, respectively. The first housing portion 104a includes a hexagonal exterior segment 112 for aiding in gripping and turning with a wrench or socket during assembly. Extending from the hexagonal exterior segment 112 is a threaded distal shank 114 for connection to an external fluid network. The threaded distal shank 114 defines the inlet 106a.

[0029] With particular reference to Figure 4B The hexagonal exterior segment 112 has an extended length li and has a proximal opening 116 having a first inner diameter dl. The proximal opening 116 is disposed adjacent to a threaded interior proximal region 118 having a second inner diameter d2 for coupling to a second housing portion 104b. The threaded interior proximal region 118 extends a length l2, then to a shoulder 120 and shoulder region 122. The shoulder region 122 has a third inner diameter d3 and a length l3, then again tapers down to an intermediate region 124 having a fourth inner diameter d4. The intermediate region 124 extends a length l4, then transitions down to a neck region 126 that is angled relative to the proximal opening 116, threaded interior proximal region 118, shoulder 120, and intermediate region 124. The neck region 126 extends to the inlet 106a.

[0030] Figure 5A and Figure 5B A second housing portion 104b of the housing 102 of the bidirectional flow-through valve 100 is shown independently in perspective view and cross-sectional plan view, respectively. The second housing portion 104b features a threaded exterior segment 128 for insertion into and assembly with the threaded interior proximal region 118 of the first housing portion 104a. A smooth exterior segment 130 defines the outlet 106b and has an interior threading 132 for mating with an external fluid network. The threaded exterior segment 128 and the cylindrical smooth exterior segment 130 are separated by a central flange 134.

[0031] With specific reference Figure 5B Similar to the first housing portion 104a of the housing 102, the second housing portion 104b has a corresponding inner proximal region 136 having a fifth inner diameter d5. The inner proximal region 136 extends a length l5, then reaches a shoulder 138, which then gradually descends to an intermediate region 140 having a sixth inner diameter d6. The intermediate region 140 extends a length l6, then transitions downward to a neck region 142, which is angled relative to the inner proximal region 136 and the intermediate region 140. The neck region 142 ultimately reaches the outlet 106b, which has internal threading for connection to an external fluid network.

[0032] With specific reference Figure 3 again to the two-way flow-through valve 100, the two-way flow-through valve 100 further includes a valve seat 200 for fixed positioning between the intermediate region 124 of the first housing portion 104a and the intermediate region 140 of the second housing portion 104b of the housing 102. The fluid passage and flow axis a extend through the valve seat 200.

[0033] The valve seat 200 is described in greater detail in Figures 6A to 6C , wherein the valve seat 200 is independently represented in perspective view, plan view, and cross-sectional view. The valve seat 200 is slightly tubular, having a circular outer surface 202 of diameter d7. Adjacent to the circular outer surface 202 is an edge 204, which marks the transition between the circular outer surface 202 and an inclined contact surface 206a. The inclined contact surface 206a forms a concave seat surface that is inclined inwardly toward and abutting an inner axial surface 208. From the inclined contact surface 206a to the inner axial surface 208, to an opposing inclined contact surface 206b, the valve seat 200 exhibits an axial length l8. The inner axial surface 208 is parallel to the circular outer surface 202, but of shorter axial length.

[0034] Figure 6B is a plan view of the valve seat 200 from a downward viewing angle along the fluid passage, while Figure 6C is a cross-sectional view of Figure 6B along the cutting line 6C-6C. In effect, along the line 6C-6C, the valve seat 200 exhibits symmetrical dimensions. As Figure 6C indicated, the valve seat 200 is also symmetrical about an axial centerline C-C.

[0035] Further shown is a central ring 210 defining a central opening 212. The fluid passage extends through and around the central ring 210. The central opening 212 has a diameter d 引导The center ring 210 is annularly spaced from the inner axial surface 208 by three equidistant radial spokes 214a-c. However, it should be appreciated that the current disclosure does not require three separate radial spokes 214a-c to space the center ring 210 from the inner axial surface 208, and likewise, embodiments of the center ring 210 do not require annular spacing from the inner axial surface 208 at all. The radial spokes 214a-c and the center ring 210 define three arcuate flow slots 216a-c, enabling additional fluid to flow therethrough.

[0036] Referring again to Figure 3 , the bidirectional flow-through valve 100 further includes a valve element assembly 300. The valve element assembly 300 includes interconnected first and second shut-off elements 302a-b. Preferably, the first and second shut-off elements 302a-b are identical, but can be uniquely configured. Figures 7A to 7D Individual shut-off elements as the first and second shut-off elements 302a-b are shown in perspective view, side plan view, enlarged detailed cross-sectional plan view, and front plan view, respectively. Both the first and second shut-off elements 302a-b have a cup portion 304 including a convex sealing surface 306 that is complementary in shape to the sloped contact surfaces 206a-b of the valve seat 200. The cup portion 304 is preferably a relatively soft, flexible material that readily provides a fluid seal.

[0037] The first and second shut-off elements 302a-b further include a clasp mechanism 308 extending axially and centrally from the convex sealing surface 306 of the cup portion 304. The clasp mechanisms 308 of the first and second shut-off elements 302a-b are designed to snap together in a buckle joint. Each clasp mechanism 308 includes a central base 310 and a pair of opposing deflectable arms 312a-b extending from the central base 310. Each deflectable arm 312a-b has a distal hook 314 that forms an angle between a sloped distal ramp surface 316 and a capture surface 318.

[0038] Each deflectable arm 312a-b further includes an intermediate boss 320. Each intermediate boss 320 extends toward the other intermediate boss 320, thus forming a capture hollow 322 adjacent the central base 310 and between the deflectable arms 312a-b. Each intermediate boss 320 further includes a complementary ramp surface 326. When interconnected, the distal hook 314 of the first shut-off element 302a is captured in the capture hollow 322 of the second shut-off element 302b, and the distal hook 314 of the second shut-off element 302b is captured in the capture hollow 322 of the first shut-off element 302a.

[0039] With specific reference Figure 7C and Figure 7D , the radially outward facing outer surface 328 of each deflectable arm 312a, 312b is circular. In this sense, in cross-section, the outer surface 328 of each deflectable arm 312a, 312b collectively forms a segment of a circle CI. Further, the distance d 臂 corresponds substantially to the diameter d Figures 6A to 6C of the central opening 212 of the valve seat 200 of 引导 such that the deflectable arms 312a, 312b can extend closely and slidably, but without restriction, through the central opening 212 of the valve seat 200.

[0040] Reference is now made to Figure 3 and Figure 8 , as a first spring 350a, a second spring 350b is shown independently in perspective view, as another component of the valve element assembly 300. The first spring 350a to the second spring 350b are preferably identical, but need not be. Each of the first spring 350a, the second spring 350b tapers outwardly from a minor end 352 having a first diameter d9to a major end 354 having a second diameter d 10 . The first diameter d9is slightly greater than the distance d 臂 of the deflectable arms 312a to 312b of the first shut-off element 302a to the second shut-off element 302b. Due to this detail, the first spring 350a, the second spring 350b can be wound around the clasp mechanism 308 of the first shut-off element 302a, the second shut-off element 302b, respectively, and rest on the central hub 310, encircling the deflectable arms 312a to 312b. Further, the second diameter d 10 of the first spring 350a, the second spring 350b is greater than the diameter d 引导 of the central opening 212. In this regard, the major end 354 of the first spring 350a, the second spring 350b can rest on the central ring 210 and / or the radial spokes 214a to 214c. It can be seen that the first spring 350a, the second spring 350b are sized and shaped to be compressed between the cup-shaped portion 304 of the deflectable arms 312a to 312b and the central ring 210 and / or the radial spokes 214a to 214c of the valve seat 200.

[0041] To assemble the bidirectional flow-through valve 100, and still referring to Figure 3The first 350a to second 350b springs are each slid around the clasp mechanism 308 of the first 302a to second 302b shut-off elements such that the secondary end 352 rests on the central base 310, encircling the deflectable arms 312a to 312b. The first 302a to second 302b shut-off elements, around which the first 350a to second 350b springs are wrapped, are positioned on opposite sides of the valve seat 200 with the deflectable arms 312a to 312b in line with the flow axis a, the convex sealing surfaces 306 of the first 302a and second 302b shut-off elements facing each other and facing the respective inclined contact surfaces 206a to 206b of the valve seat 200. The first 302a to second 302b shut-off elements are oriented approximately 90 degrees relative to each other about the flow axis a. For example, the first 302a shut-off element is rotated 90 degrees clockwise or counterclockwise relative to the second 302b shut-off element while ensuring that the deflectable arms 312a to 312b of the first 302a to second 302b shut-off elements remain in line with the flow axis a.

[0042] The first 302a to second 302b shut-off elements are then interconnected by passing the deflectable arms 312a to 312b through the central opening 212 of the valve seat 200 with the cup portions 304 still on opposite sides of the valve seat 200. When the first 302a to second 302b shut-off elements are pressed together, the distal inclined surface 316 contacts and slides against the complementary ramp surface 326 of the opposing intermediate boss 320. As a result, the deflectable arms 312a to 312b are temporarily deflected radially outward during the connection process until the distal hooks 314 snap into the capture hollows 322.

[0043] Upon connection, the distal hook 314 of the first 302a shut-off element is captured in the capture hollow 322 of the second 302b shut-off element, while the distal hook 314 of the second 302b shut-off element is captured in the capture hollow 322 of the first 302a shut-off element. The primary end 354 of the first 350a to second 350b springs rests on the central ring 210 and / or radial spokes 214a to 214c of the valve seat 200. The secondary end 352 of the first 350a, second 350b springs rests on the central base 310 of the first 302a to second 302b shut-off elements.

[0044] The first spring 350a, second spring 350b are of appropriate constant and length to bias the convex sealing surface 306 of the first to second shut-off elements 302a-b axially away from the inclined contact surfaces 206a-b of the valve seat 200 along the flow axis a, such that the convex sealing surface 306 and the inclined contact surfaces 206a-b do not mate under normal operating conditions. In other words, the first spring 350a, second spring 350b bias the convex sealing surface 306 away from the inclined contact surfaces 206a-b to allow fluid to bypass the first to second shut-off elements 302a-b and flow through the valve seat 200. Accordingly, the opposing forces from the first to second springs 350a-b are carefully balanced.

[0045] Due to the curvature of the outer surface 328 of each deflectable arm 312a-b and the distance d between the deflectable arms 312a-b 臂 The deflectable arms 312a-b of the first to second shut-off elements 302a-b fit snugly within the central opening 212 of the valve seat 200. Accordingly, the central opening 212 of the central ring 210 guides the axial movement of the valve element assembly 300 such that the valve element assembly 300 moves smoothly and linearly with minimal wobble that creates and maintains a centering effect.

[0046] With the first to second shut-off elements 302a-b, first to second springs 350a-b, and valve seat 200 attached as a subassembly, the first and second housing portions 104a-b are brought together on either side of the valve seat 200, still in line with the flow axis a. To this end, the subassembly is inserted into the first housing portion 104a, and the threaded outer section 128 of the second housing portion 104b is mated and screwed with the threads of the threaded inner proximal region 118 of the first housing portion 104a.

[0047] With this operation, the valve seat 200 is fixed in the inner proximal region 136 formed by the second housing portion 104b and the proximal opening 116 formed by the first housing portion 104a. The valve seat 200 is fixed substantially centrally, as the sum of the axial length l3 of the inner proximal region 136 of the second housing portion 104b and the length l1 of the proximal opening 116 approximates the axial length l7 of the valve seat 200. Additionally or alternatively, to secure the valve seat 200 in place, the circular outer surface 202 of the valve seat 200 having a diameter d7 corresponds to the fifth inner diameter d5 of the inner proximal region 136 of the second housing portion 104b and / or the first inner diameter dl of the proximal opening 116 formed by the first housing portion 104a, such that the housing 102 effectively tightly wraps the valve seat 200 to secure the valve seat 200 in place.

[0048] When the valve seat 200 is fixed in place, and the bias from the first spring 350a to the second spring 350b is balanced, the cup-shaped portions 304 of the first throttling elements 302a to the second throttling elements 302b extend into the intermediate regions 124, 140. Since the fourth inner diameter d4 of the intermediate region 124 and the sixth inner diameter d6 of the intermediate region 140 are larger than the cup-shaped portions 304, the cup-shaped portions 304 can slide freely axially within the intermediate regions 124, 140. The axial length l4 of the intermediate regions 124, 140 is sufficient to allow the first throttling elements 302a to the second throttling elements 302b to move against the relatively inclined contact surfaces 206a to 206b of the valve seat 200 in either the right or left direction.

[0049] Return to reference Figure 2 The image shows a cross-section of a bidirectional overflow valve 100 in reverse configuration. A valve element assembly 300, including a first throttling element 302a and a second throttling element 302b, and first springs 350a to 350b, extends through a valve seat 200. The first throttling element 302a to 302b are normally biased away from the valve seat 200 by balancing the forces of the first springs 350a to 350b, which can be seen as being in an open position to allow fluid to flow in either direction through the fluid passage of the bidirectional overflow valve 100.

[0050] In operation, Figure 2 Under normal flow conditions from inlet 106a to outlet 106b, the first throttling element 302a and the second throttling element 302b are biased away from the valve seat 200 by the first spring 350a and the second spring 350b. Therefore, unimpeded flow is permitted through the fluid passage from inlet 10ba to outlet 10bb. If the bidirectional overflow valve 100 is unintentionally installed in reverse or the flow in the fluid network is reversed, the normal flow from right to left (i.e., from outlet 106b to inlet 106a) is the same, because the flow is also unimpeded from outlet 106b to inlet 106a.

[0051] Under overflow conditions, when the pressure of the fluid flow exceeds a predetermined level in either direction, the fluid flow will close the bidirectional overflow valve 100. The predetermined level is based on the spring force, the size of the cup-shaped portions 304 of the first throttling element 302a to the second throttling element 302b, the intermediate regions 124, 140 of the second housing portion 104b and the proximal regions 118 and 136 of the threaded interior, and other factors. The typical pressure of the external fluid network to which the bidirectional overflow valve is connected can be predetermined so that the aforementioned valve parameters can be adjusted for a specific application.

[0052] However, when the pressure of the fluid flow exceeds a predetermined level, the pressure of the fluid flow overcomes the bias of the first spring 350a against the first throttling element 302a, and thus causes the first throttling element 302a to rest against the valve seat 200. (See reference...) Figure 2 The flow from left to right causes the first throttling element 302a to move to the right until it seals the corresponding inclined contact surfaces 206a to 206b to close the fluid passage. Similarly, the flow from right to left causes the second throttling element 302b to move to the left until it seals the corresponding inclined contact surfaces 206a to 206b to close the fluid passage. Therefore, regardless of the flow pattern, the bidirectional flow control valve 100 performs the same operation without operational failure.

[0053] More specifically, because the radially outward outer surface 328 of each deflectable arm 312a to 312b is circular, forming circular segments in the cross-section, and further because the distance d between the radially outward outer surfaces 328 of the opposing deflectable arms 312a to 312b is... 臂 The diameter d of the center opening 212 of the valve seat 200 引导 Essentially correspondingly, the pressure of the fluid flow causes the first throttling element 302a to slide along the radially outward outer surface 328 of each deflectable arm 312a to 312b into the central opening 212 of the valve seat 200 until the first throttling element 302a abuts against the valve seat 200. Therefore, the convex sealing surface 306 seals against the inclined contact surfaces 206a to 206b of the valve seat 200 to prevent fluid from permeating from the inlet 106a to the outlet 106b under pressure.

[0054] Similarly, if reversed, the flow of fluid will close the bidirectional overflow valve 100. There, the pressure of the fluid flow overcomes the bias of the second spring 350b against the second shut-off element 302b, and thus causes the second shut-off element 302b to rest against the valve seat 200.

[0055] More specifically, because the radially outward outer surface 328 of each deflectable arm 312a to 312b is circular, forming circular segments in the cross-section, and further because the distance d between the radially outward outer surfaces 328 of the opposing deflectable arms 312a to 312b is... 臂 The diameter d of the center opening 212 of the valve seat 200 引导The pressure of the fluid flow substantially corresponds, so the pressure of the fluid flow urges the second shut-off element 302b along the radially outward outer surface 328 of each deflectable arm 312a-b to slide into the central opening 212 of the valve seat 200 until the second shut-off element 302b abuts the valve seat 200. Thus, the convex sealing surface 306 seals with the inclined contact surfaces 206a-b of the valve seat 200 to impede fluid from permeating from the outlet 106b to the inlet 106a under pressure.

[0056] Upon recovery from the over-flow condition, i.e., to normal flow, where the pressure of the fluid flow does not exceed the predetermined level, the bi-directional over-flow valve 100 will re-open. At this time, the bias of the first spring 350a against the first shut-off element 302a exceeds the pressure of the fluid flow. The first spring 350a moves the first shut-off element 302a away from the inclined contact surfaces 206a-b to open the fluid passage. Similarly, in the reverse direction, the bias of the second spring 350b moves the second shut-off element 302b away from the inclined contact surfaces 206a-b to open the fluid passage.

[0057] In one embodiment, the valve seat 200 or other components can be formed of a material that expands upon exposure to high heat to close the valve. For example, the valve seat 200 can be an ethylene copolymer-based expandable sealant that expands between 350°F to 425°F. Thus, the valve seat 200, including any of the central ring 210, radial spokes 214a-c, inclined contact surfaces 206a-b, and / or inner axial surface 208, can expand to stop fluid flow upon exposure to extreme temperatures and the valve seat 200 reaches 350°F to 425°F. Due to the expansion, the valve will automatically close due to high temperatures (e.g., a dangerous fire event) and can need to be replaced thereafter.

[0058] In another embodiment, the valve is non-reversible in that the valve shut-off element includes only a first cup-shaped portion with several, preferably two to four, deflectable arms extending into the central opening. The deflectable arms can have a distal hook that snap-engages the central opening to prevent removal from the central opening of the central ring while still directing axial movement. In yet another embodiment, the valve seat simply necks down to the central opening.

[0059] From a review of the subject disclosure, it can be seen that the technology herein provides a bidirectional flow control valve. The technology also discloses components that are easy to manufacture and assemble, such as snap-engaging deflectable arms, but are functionally unique. Those of ordinary skill in the relevant art will appreciate that, in alternative embodiments, the functions of several elements could be performed by fewer elements or even a single element. Similarly, in some embodiments, any function element could perform fewer or different operations than those described with respect to the illustrated embodiments. In addition, functional elements that are displayed as distinct for purposes of illustration (e.g., valve elements, connection mechanisms, spring assemblies, etc.) can be combined into other functional elements in particular embodiments.

[0060] Further, the present application is directed to example embodiments defined by the following clauses:

[0061] Clause 1. A bidirectional flow control valve for automatically stopping delivery of fluid from a supply in a fluid network, wherein the bidirectional flow control valve comprises:

[0062] a housing defining an interior that forms a fluid passageway along a flow axis between a first opening and a second opening;

[0063] a valve seat in the interior through which the fluid passageway extends; and

[0064] a valve element assembly comprising a first shut-off element and a second shut-off element disposed on opposite sides of the valve seat, wherein the first and second shut-off elements are normally biased in an open position disposed apart from the valve seat to allow fluid to pass through the fluid passageway,

[0065] wherein:

[0066] in a first closed position, the first shut-off element is configured to move against the valve element assembly to close the fluid passageway when flow through the fluid passageway from the first opening to the second opening exceeds a first predetermined level; and

[0067] in a second closed position, the second shut-off element is configured to move against the valve element assembly to close the fluid passageway when flow through the fluid passageway from the second opening to the first opening exceeds a second predetermined level.

[0068] Clause 2. The bidirectional flow control valve of Clause 1, wherein:

[0069] the first shut-off element defines a first convex outer surface;

[0070] the second shut-off element defines a second convex outer surface; and

[0071] The valve seat defines a first concave seat surface opposite a second concave seat surface, wherein the first convex outer surface faces the first concave seat surface and the second convex outer surface faces the second concave seat surface.

[0072] Clause 3. The bidirectional flow-through valve of clause 1, wherein the valve element assembly includes a snap-on mechanism configured to snap-engage the first shut-off element and the second shut-off element together.

[0073] Clause 4. The bidirectional flow-through valve of clause 3, wherein the snap-on mechanism includes:

[0074] a first pair of opposing first deflectable arms extending from the first shut-off element, each first deflectable arm having a distal hook and an intermediate boss defining a first capture hollow adjacent the first shut-off element; and

[0075] a second pair of opposing second deflectable arms extending from the second shut-off element, each second deflectable arm having a distal hook and an intermediate boss defining a second capture hollow adjacent the second shut-off element, such that the distal hooks of the first pair are selectively captured in the second capture hollow and the distal hooks of the second pair are selectively captured in the first capture hollow.

[0076] Clause 5. The bidirectional flow-through valve of clause 4, wherein the first pair of opposing first deflectable arms and the second pair of opposing second deflectable arms form a radially outward curved surface that forms a portion of a circle in cross-section.

[0077] Clause 6. The bidirectional flow-through valve of clause 5, wherein the valve seat includes a central ring defining a central opening through which the fluid passageway and the first pair of opposing first deflectable arms and the second pair of opposing second deflectable arms extend; and the central ring guides axial movement of the valve element assembly through the central opening of the same size as the circle.

[0078] Clause 7. The bidirectional flow-through valve of clause 6, wherein the bidirectional flow- through valve further comprises: a first spring extending between the valve seat and the first shut-off element to bias the first shut-off element in the open position; and a second spring extending between the valve seat and the second shut-off element to bias the second shut-off element in the open position, wherein the center ring acts as a stop for the first and second springs and the first and second springs bias to reopen the bidirectional flow- through valve when the flow drops below the first and second predetermined levels, respectively.

[0079] Clause 8. The bidirectional flow-through valve of clause 1, wherein the valve seat is formed of an ethylene copolymer-based material that expands at high temperatures of 350°F to 425°F to close the fluid passageway.

[0080] Clause 9. A flow-through valve for automatically stopping delivery of fluid from a supply in a fluid network, wherein the flow-through valve comprises:

[0081] a housing defining an interior that forms a fluid passageway along a flow axis between a first opening and a second opening;

[0082] a valve seat secured in the interior and forming a central opening, wherein the fluid passageway extends through the central opening;

[0083] a valve element assembly comprising: a first shut-off element for selectively sealing the valve seat to block the fluid passageway; and at least two arms extending from the first shut-off element through the central opening, wherein the at least two arms: are retained in the central opening by a distal hook on each arm; and are sized and configured to guide axial movement of the valve element assembly; and

[0084] a spring extending between the valve seat and the valve element assembly for normally biasing the valve element assembly away from the valve seat in an open position to allow fluid to pass through the fluid passageway,

[0085] wherein in a first closed position, the first shut-off element is configured to move against the valve element assembly to close the fluid passageway when flow through the fluid passageway from the first opening to the second opening exceeds a first predetermined level.

[0086] Clause 10. The flow-through valve of clause 9, wherein the valve seat has an interior axial surface having a center ring secured therein, the center ring defining the central opening and capturing the distal hooks.

[0087] Clause 11. The excess flow valve of clause 9, wherein the valve element assembly includes a second shut-off element for selectively sealing the valve seat to block the fluid passageway, having at least two arms extending from the second shut-off element through the central opening, wherein the at least two arms of the second shut-off element have distal hooks for coupling to the first shut-off element and are sized and configured to direct axial movement of the valve element assembly,

[0088] and the valve element assembly further includes a second spring extending between the valve seat and the second shut-off element for normally biasing the second shut-off element away from the valve seat to allow fluid to pass through the fluid passageway in an open position,

[0089] wherein in a second closed position, the second shut-off element is configured to move against the valve element assembly to close the fluid passageway when flow through the fluid passageway from the second opening to the first opening exceeds a second predetermined level.

[0090] Clause 12. The excess flow valve of clause 11, wherein each of the arms has a boss forming a capture hollow to snap engage the first and second shut-off elements together.

[0091] Clause 13. The excess flow valve of clause 9, wherein the at least two arms form radially outward curved surfaces that form a portion of a circle in cross-section.

[0092] Clause 14. The excess flow valve of clause 9, wherein the valve seat is formed of an ethylene copolymer-based material that expands at high temperatures of 350°F to 425°F to close the fluid passageway.

[0093] Clause 15. An excess flow valve for automatically stopping delivery of fluid from a supply in a fluid network, wherein the excess flow valve includes:

[0094] a housing defining an interior that forms a fluid passageway along a flow axis;

[0095] a valve seat secured in the interior and forming a central opening, wherein the fluid passageway extends through the central opening;

[0096] a first shut-off element and a second shut-off element for selectively sealing the valve seat to block the fluid passage, the first and second shut-off elements being connected together by a clasp mechanism and held in the central opening, the first and second shut-off elements being sized and configured to guide axial movement of a valve element assembly including the shut-off elements and the second shut-off element; and

[0097] two springs extending between the valve seat and each shut-off element for normally biasing the shut-off elements away from the valve seat in an open position to allow fluid to pass through the fluid passage,

[0098] wherein in a closed position, the first and second shut-off elements are configured to move against the valve element assembly to close the fluid passage when flow through the fluid passage exceeds a predetermined level.

[0099] While the subject technology has been described with respect to various embodiments, those skilled in the art will readily appreciate that various changes and / or modifications can be made to the subject technology without departing from the scope of the present disclosure.

Claims

1. A bidirectional over-flow valve for automatically stopping the delivery of fluid from a supply in a fluid network, characterized in that, The bidirectional flow-excess valve comprises: a housing defining an interior forming a fluid passageway along a flow axis between a first opening and a second opening; a valve seat in the interior through which the fluid passageway extends; and a valve element assembly comprising a first shut-off element and a second shut-off element disposed on opposite sides of the valve seat, wherein the first and second shut-off elements are normally biased in an open position disposed apart from the valve seat to allow fluid to pass through the fluid passageway, wherein: in a first closed position, the first shut-off element is configured to move against the valve element assembly to close the fluid passageway when flow through the fluid passageway from the first opening to the second opening exceeds a first predetermined level; and in a second closed position, the second shut-off element is configured to move against the valve element assembly to close the fluid passageway when flow through the fluid passageway from the second opening to the first opening exceeds a second predetermined level.

2. The bidirectional flow-excess valve of claim 1, wherein: the first shut-off element defines a first convex outer surface; the second shut-off element defines a second convex outer surface; and the valve seat defines a first concave seat surface opposite a second concave seat surface, wherein the first convex outer surface faces the first concave seat surface and the second convex outer surface faces the second concave seat surface.

3. The bidirectional flow-through valve of claim 1, wherein, the valve element assembly comprises a snap-on mechanism configured to snap-engage the first and second shut-off elements together.

4. The bidirectional flow-through valve of claim 3, wherein, the snap-on mechanism comprises: a first pair of opposing first deflectable arms extending from the first shut-off element, each first deflectable arm having a distal hook and an intermediate boss defining a first capture hollow adjacent the first shut-off element; and a second pair of opposing second deflectable arms extending from the second shut-off element, each second deflectable arm having a distal hook and an intermediate boss defining a second capture hollow adjacent the second shut-off element, such that the distal hooks of the first pair are selectively captured in the second capture hollow and the distal hooks of the second pair are selectively captured in the first capture hollow.

5. The bidirectional flow-through valve of claim 4, wherein, the first and second pairs of opposing deflectable arms form radially outward curved surfaces that form a portion of a circle in cross-section.

6. The bidirectional flow-through valve of claim 5, wherein, the valve seat comprises a center ring defining a center opening through which the fluid passageway and the first and second pairs of opposing deflectable arms extend; and the center ring guides axial movement of the valve element assembly through the center opening of the same size as the circle.

7. The bidirectional flow-through valve of claim 6, wherein, The bidirectional flow-through valve further includes a first spring extending between the valve seat and the first shut-off element to bias the first shut-off element in the open position and a second spring extending between the valve seat and the second shut-off element to bias the second shut-off element in the open position, wherein the center ring acts as a stop for the first and second springs and the first and second springs bias to reopen the bidirectional flow-through valve when the flow drops below the first and second predetermined levels, respectively.

8. The bidirectional flow-through valve of claim 1, wherein, The valve seat is formed of an ethylene copolymer-based material that expands at high temperatures of 350°F to 425°F to close the fluid passageway.

9. An over-flow valve for automatically stopping the delivery of fluid from a supply in a fluid network, characterised in that, The flow-through valve includes: a housing defining an interior forming a fluid passageway along a flow axis between a first opening and a second opening; a valve seat secured in the interior and forming a central opening, wherein the fluid passageway extends through the central opening; a valve element assembly including a first shut-off element to selectively seal the valve seat to block the fluid passageway and at least two arms extending from the first shut-off element through the central opening, wherein the at least two arms are retained in the central opening by distal hooks on each arm and are sized and configured to direct axial movement of the valve element assembly; and a spring extending between the valve seat and the valve element assembly to normally bias the valve element assembly away from the valve seat in an open position to allow fluid to pass through the fluid passageway, wherein in a first closed position, the first shut-off element is configured to move against the valve element assembly to close the fluid passageway when flow through the fluid passageway from the first opening to the second opening exceeds a first predetermined level.

10. The relief valve of claim 9, wherein, The valve seat has an interior axial surface having a center ring secured therein that defines the central opening and captures the distal hooks.

11. The relief valve of claim 9, wherein The valve element assembly includes a second shut-off element to selectively seal the valve seat to block the fluid passageway having at least two arms extending from the second shut-off element through the central opening, wherein the at least two arms of the second shut-off element have distal hooks for coupling to the first shut-off element and are sized and configured to direct axial movement of the valve element assembly, and the valve element assembly further includes a second spring extending between the valve seat and the second shut-off element to normally bias the second shut-off element away from the valve seat in an open position to allow fluid to pass through the fluid passageway, wherein in the second closed position, the second shutoff element is configured to move against the valve element assembly to close the fluid passage when flow through the fluid passage from the second opening to the first opening exceeds a second predetermined level.

12. The relief valve of claim 11, wherein, Each of the arms has a ledge forming a capture hollow to snap engage the first and second shutoff elements together.

13. The relief valve of claim 9, wherein, The at least two arms form a radially outward curved surface that forms a portion of a circle in cross-section.

14. The relief valve of claim 9, wherein, The valve seat is formed of an ethylene copolymer-based material that expands at high temperatures of 350°F to 425°F to close the fluid passage.

15. An over-flow valve for automatically stopping the delivery of fluid from a supply in a fluid network, characterised in that, The over-flow valve includes: a housing defining an interior forming a fluid passage along a flow axis; a valve seat secured in the interior and forming a central opening, wherein the fluid passage extends through the central opening; a first and second shutoff element for selectively sealing the valve seat to block the fluid passage, the first and second shutoff elements connected together by a snap-on mechanism and retained in the central opening, the first and second shutoff elements sized and configured to direct axial movement of a valve element assembly including the first and second shutoff elements; and two springs extending between the valve seat and each shutoff element for normally biasing the shutoff elements away from the valve seat in an open position to allow fluid to pass through the fluid passage, wherein in a closed position, the first and second shutoff elements are configured to move against the valve element assembly to close the fluid passage when flow through the fluid passage exceeds a predetermined level. wherein in the second closed position, the second shutoff element is configured to move against the valve element assembly to close the fluid passage when flow through the fluid passage from the second opening to the first opening exceeds a second predetermined level. Each of the arms has a ledge forming a capture hollow to snap engage the first and second shutoff elements together. The at least two arms form a radially outward curved surface that forms a portion of a circle in cross-section. The valve seat is formed of an ethylene copolymer-based material that expands at high temperatures of 350°F to 425°F to close the fluid passage. The over-flow valve includes: a housing defining an interior forming a fluid passage along a flow axis; a valve seat secured in the interior and forming a central opening, wherein the fluid passage extends through the central opening; a first and second shutoff element for selectively sealing the valve seat to block the fluid passage, the first and second shutoff elements connected together by a snap-on mechanism and retained in the central opening, the first and second shutoff elements sized and configured to direct axial movement of a valve element assembly including the first and second shutoff elements; and two springs extending between the valve seat and each shutoff element for normally biasing the shutoff elements away from the valve seat in an open position to allow fluid to pass through the fluid passage, wherein in a closed position, the first and second shutoff elements are configured to move against the valve element assembly to close the fluid passage when flow through the fluid passage exceeds a predetermined level.

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