Dual disc low pressure back-check valve
First Claim
1. A one-way check valve which comprises:
- a valve housing having a valve seat,valve element means within said valve housing for opening with a pressure differential of less than two inches of water and which is biased against the valve seat in a normally closed position,a pair of support pins for holding said valve element means in said biased normally closed position, said valve element means including a flexible disc and a semi-rigid disc, said semi-rigid disc being of slightly smaller diameter than said flexible disc to reduce the chance of air bubbles clinging to the edge of the discs, said pair of support pins being within said valve housing, and these two pins being spaced 180°
from each other.
2 Assignments
0 Petitions
Accused Products
Abstract
A low pressure back-check valve comprising a valve housing with a fluid inlet and outlet, a valve seat, and a dual disc valve element normally biased into closed position against the valve seat by mechanical support structure within the housing. One of the dual discs is made of pure gum rubber and/or like material, while the other disc is made of semi-rigid plastic material, such as unplasticized Polyvinyl Chloride (PVC). The mechanical support structure includes a pair of pins spaced 180° apart. While these pins constantly hold the dual discs in biased position against the valve seat, because of the compliant construction of the dual discs, the valve can open under a very low pressure, such as 0.02 pounds per square inch.
144 Citations
13 Claims
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1. A one-way check valve which comprises:
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a valve housing having a valve seat, valve element means within said valve housing for opening with a pressure differential of less than two inches of water and which is biased against the valve seat in a normally closed position, a pair of support pins for holding said valve element means in said biased normally closed position, said valve element means including a flexible disc and a semi-rigid disc, said semi-rigid disc being of slightly smaller diameter than said flexible disc to reduce the chance of air bubbles clinging to the edge of the discs, said pair of support pins being within said valve housing, and these two pins being spaced 180°
from each other. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A medical liquid back-check valve comprising:
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a housing having a fluid flow inlet, a fluid flow outlet and a valve seat therebetween, compliant valve means permanently biased by mechanical support means against said valve seat, said valve means formed of two different materials for effecting efficient sealing and yet permitting valve opening at a very low pressure, and said compliant valve means includes a pair of discs, one disc being of flexible, resilient material and the other disc being of semi-rigid material, said semi-rigid disc being of slightly smaller diameter than said flexible disc to reduce the change of air bubbles clinging to the edge of the discs, said mechanical support means comprises only a pair of spaced pins, each of said pins being within said valve housing, and these pins being spaced 180°
from each other. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification