Two-way check valve

Details Two-way check valve Two-way check valve

2000-01-31

2001-10-09

Buiz, Michael Powell (Department: 3753)

Fluid handling

Line condition change responsive valves

Bi-directional flow valves

C137S102000, C137S493800, C137S493900, C137S512000, C137S860000

Reexamination Certificate

active

06298873

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention pertains to a two-way check valve, such that air flow from an air space is through a first passageway, while air flow to the air space is through a second passageway. The first and second passageways include openings which are selectively sealed by O-rings.
2. Description of the Prior Art
In the prior art, flow limiters or check valves have been provided which are unidirectional. The bi-directional check valves and flow limiters, as well as many of the unidirectional check valves and flow limiters, have tended to have a complicated structure with attendant high manufacturing and maintenance costs. Moreover, some of these devices have not sealed the moment the plunger stopped moving and have not satisfactorily provided for consistency of performance due to the reliance on the dynamic movement of the lip seal. Similarly, many of these devices have not been self-cleaning thereby further increasing the maintenance costs.
Moreover, in the prior art, damping action can be dependent on the lip seal seating against the face of the plunger consistently. This action can be prone to gathering lubricants, debris and moisture caught in the “sandwiching” action. Moreover, a linear action must occur to move the lip seal from a sealed position to an unsealed position.
Representative prior art includes U.S. Pat. No. 5,762,10.3 entitled “Tilting O-Ring Check Valve” issued on Jun. 9, 1998 to Gregoire; U.S. Pat. No. 5,660,205 entitled “One-Way Valve” issued on Aug. 26, 1997 to Epstein; U.S. Pat. No. 5,126,722 entitled “Point of Lube Monitor” issued on Jun. 30, 1992 to Kamis; U.S. Pat. No. 4,549,565 entitled “Reclosing Rupture Disk Assembly” issued on Oct. 29, 1985 to Short, III; U.S. Pat. No. 4,497,749 entitled “Check Valve for Ammonia Injector Apparatus” issued on Feb. 5, 1985 to Strauss; U.S. Pat. No. 4,428,566 entitled “Two-Tube Hydropneumatic Shock Absorber” issued on Jan. 31, 1984 to de Baan et al.; U.S. Pat. No. 4,237,935 entitled “Hydraulic Pressure Relief Valve and Fluid Isolator” issued on Dec. 9, 1980 to Delmonte et al.; U.S. Pat. No. 4,214,607 entitled “Unidirectional Flow Limiter” issued on Jul. 29, 1980 to Bouteille; and U.S. Pat. No. 4,111,228 entitled “Respiratory Valve, Especially for Anaesthetic Circuits” issued on Sep. 5, 1978 to Simionescu.
OBJECTS AND SUMMARY OF THE INVENTION
It is therefore an object of this invention to provide a bi-directional check valve.
It is therefore a further object of this invention to provide a bi-directional check valve which has a simple design.
It is therefore a still further object of this invention to provide a bi-directional check valve which has reduced maintenance requirements.
It is therefore a still further object of this invention to provide a bi-directional check valve which can be configured in a self-cleaning configuration.
It is therefore a still further object of this invention to provide a bi-directional check valve which seals the moment the plunger stops moving.
It is therefore a still further object of this invention to provide a bi-directional check valve which has consistency of performance.
It is therefore a still further object of this invention to provide a bi-directional check valve which is economical to manufacture.
These and other objects are attained by providing a bi-directional check valve with a unitary body with two portions separated by a transverse plate and two passageways therethrough. The first portion is intended to be in communication with a first air space while the second portion is intended to be in communication with a second air space. A first of these passageways leads from an opening in a circular channel in which an O-ring is engaged in the first portion to an opening in the end of the second portion. Likewise, the second of these passageways leads from an opening in a circular channel in which an O-ring is engaged in the second portion to opening in the end of the first portion. The O-rings selectively open and close the openings of the passageways in response to pressure differences between the first and second air spaces.


REFERENCES:
patent: 3451422 (1969-06-01), Chorkey
patent: 3468337 (1969-09-01), Smirl
patent: 4111228 (1978-09-01), Simionescu
patent: 4214607 (1980-07-01), Bouteille
patent: 4237935 (1980-12-01), Delmonte et al.
patent: 4428566 (1984-01-01), deBaan et al.
patent: 4497749 (1985-02-01), Strauss
patent: 4549565 (1985-10-01), Short, III
patent: 5126722 (1992-06-01), Kamis
patent: 5477829 (1995-12-01), Hassinger et al.
patent: 5623958 (1997-04-01), Bumpers
patent: 5638860 (1997-06-01), DeRoche
patent: 5660205 (1997-08-01), Epstein
patent: 5762103 (1998-06-01), Gregoire
patent: 6009895 (2000-01-01), Wass et al.
patent: 6168400 (2001-01-01), Van Davelaar et al.
patent: 214597 (1956-11-01), None
patent: 1038587 (1953-09-01), None

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