Fluid handling – Line condition change responsive valves – Direct response valves
Reexamination Certificate
2006-04-11
2010-11-16
Fox, John (Department: 3753)
Fluid handling
Line condition change responsive valves
Direct response valves
C251S057000
Reexamination Certificate
active
07832431
ABSTRACT:
A check valve (10) comprises, a flexible tube (11) having first and second end portions defining an inlet (13) and an outlet (14), respectively, and a rigid valve body (12) surrounding the flexible tube (11). The end portions of the flexible tube are sealingly fixed to the valve body (12) to define an enclosed space (17) between the exterior of the flexible tube and the interior of the valve body. A fixed volume of a substantially incompressible fluid is located in the enclosed space (17). When the pressure at the outlet (14) is greater than the pressure at the inlet (13), the flexible tube is substantially collapsed so as to close the valve or allow severely restricted flow. However when the pressure at the inlet is greater than that at the outlet, some of the fluid is displaced from the inlet area towards the outlet area so that the flexible tube (11) is expanded in the area adjacent the inlet and the tube is substantially open. A pump based on a series of valves having some of the attributes of the check valve is also disclosed, as is a vacuum driven sewer system that incorporates a pinch valve.
REFERENCES:
patent: 3387624 (1968-06-01), Soucy
patent: 3479001 (1969-11-01), Dower
patent: 3494588 (1970-02-01), Kisling
patent: 3951572 (1976-04-01), Ray, Jr. et al.
patent: 3984080 (1976-10-01), Varis et al.
patent: 4111391 (1978-09-01), Pillola
patent: 4135550 (1979-01-01), Andersson
patent: 4344743 (1982-08-01), Bessman
patent: 4382582 (1983-05-01), Seki
patent: 4492253 (1985-01-01), Raftis
patent: 4607663 (1986-08-01), Raftis et al.
patent: 4630635 (1986-12-01), Bernstein et al.
patent: 5205325 (1993-04-01), Piper
patent: 5535983 (1996-07-01), Hohermuth
patent: 5570715 (1996-11-01), Featheringill et al.
patent: 5931197 (1999-08-01), Raftis et al.
patent: 5931648 (1999-08-01), Del Canizo
patent: 6575425 (2003-06-01), Betz
patent: 6585005 (2003-07-01), Raftis et al.
patent: 6953059 (2005-10-01), Raftis
patent: 2250932 (1975-06-01), None
patent: 61053470 (1986-03-01), None
Coats and Bennett
Fox John
LandOfFree
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