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Check valve having variable opening-force threshold

A one-way valve, valve seat technology, applied in the direction of lift valve, control valve, valve device, etc., can solve the problem of not having open one-way valve and so on

Inactive Publication Date: 2004-12-01
WATTS IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, none of the above-mentioned devices has the ability to open the one-way valve at different liquid flow thresholds

Method used

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  • Check valve having variable opening-force threshold
  • Check valve having variable opening-force threshold
  • Check valve having variable opening-force threshold

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Embodiment Construction

[0024] In the description shown in Figure 1- Figure 12 While presenting preferred and alternative embodiments of the invention, specific terminology has been employed for the sake of clarity. However, the present invention is not limited to the selected specific terms, and it can be understood that each specific technical term includes all technical equivalents that work in a similar manner and achieve similar technical effects.

[0025] Referring now to FIGS. 1-2 , the preferred embodiment of the present invention is a one-way valve assembly 10, wherein the one-way valve assembly 10 is basically formed by three relatively movable components, including a mounting part 20, A shutter assembly 120 and a rotatable closure arm assembly 340.

[0026] More specifically, the mounting member 20 is preferably substantially circular and annular in shape and has a mounting portion 22 , a valve seat portion 50 and a valve bracket 70 . Seat portion 50 preferably has a smaller diameter th...

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Abstract

A check valve (10) is provided to maintain fluid flow in a single desired direction through a conduit. The check valve (10) requires a greater fluid pressure to open the check valve to allow fluid to pass in a desired direction than an amount of pressure required to keep the check valve in its open position. This variable opening force performance is provided by providing a closure arm (340) exerting a closure force on a flapper (120) urging the flapper toward its closed position. Contact between the closure arm (340) and the flapper (120) occurs between a follower (360) on the closure arm (340) and a cam surface (126) on the flapper (120). A contour of the cam surface on the flapper, and especially a hump (124) on the cam surface causes the closure arm (340) to exert a variable amount of force on the flapper (120) depending on the position of the flapper. When the flapper (120) is closed a relatively large amount of force is exerted on teh flapper. When the flapper (120) is open a relatively smaller amount of force is exerted on the flapper by the closure arm (340). The dimensions and contours of the follower (360) and the cam surface (126) can be customized to provide desired closure arm force exerting characteristics for the check valve (10) of this invention.

Description

technical field [0001] The present invention relates generally to a one-way valve for preventing the flow of liquid in a reverse direction, and more particularly, to a one-way valve having a variable opening-force threshold. Background technique [0002] Backflow check valves are typically used in liquid flow piping to prevent reverse flow or backflow of downstream liquid, such as from service lines or main supply lines. Such check valves are typically located between the main supply line and the service line to a facility (school, residence, etc.). Examples of such check valves can be found in U.S. Patent No. 6,050,293 to Lin et al., U.S. Patent No. 3,789,874 to Hills, U.S. Patent No. 4,887,792 to Kuo, U.S. Patent No. 3,482,603 ​​to Outcalt, and U.S. Patent No. 3,334,858 to Hay. . [0003] Although Lin et al., Hills, Kuo, Outcalt and Hay all disclose a one-way valve for preventing backflow in pipelines, their designs have many disadvantages compared with the present inven...

Claims

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Application Information

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IPC IPC(8): F16K15/03
CPCF16K15/033Y10T137/7898
Inventor 欧内斯特·B·雷
Owner WATTS IND
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