Check valve

Details Check valve Check valve

1981-02-23

1984-06-05

Michalsky, Gerald A.

Fluid handling

Removable valve head and seat unit

Retained by bonnet or closure

1374842, 13754313, F16K 1506

Patent

active

044522720

ABSTRACT:
Two check valves in series with a zone between them are mounted between the supply pipe and discharge pipe, and a relief valve vents the zone to atmosphere under predetermined pressure conditions in the pipes. A valve poppet in the upstream check valve cooperates with its seat and an enclosing stationary barrel to form a first chamber. An ejector nozzle receives liquid from this first chamber when the valve poppet is open, and discharges it into the zone. The action of the ejector nozzle aspirates a second chamber in the upstream check valve to reduce the pressure drop when the valve is open. The velocity head of the discharge from the ejector nozzle is directed against a valve poppet in the downstream check valve, which also includes a pressure affected piston area. In each check valve the flow restriction across the valve seat decreases more rapidly than the downstream flow restriction. Also, the outer surface of the valve poppet in the upstream check valve defines, with its stationary barrel enclosure, a series of ribs and cavities which direct flow of fluid from the check valve through the ejector nozzle while minimizing flow into the aspirated chamber. A relief valve device connected to vent the zone to atmosphere has a valve stem subjected to a pressure differential between the inlet pressure to the upstream check valve and the reduced pressure in its aspirated chamber.

REFERENCES:
patent: 2223699 (1940-12-01), Norgren
patent: 2225880 (1940-12-01), Montelius
patent: 2308187 (1943-01-01), MacLean
patent: 2504470 (1950-04-01), Trautman
patent: 2886058 (1959-05-01), Horton
patent: 3438391 (1969-04-01), Yocum
patent: 3665950 (1972-05-01), Nelson
patent: 3996962 (1976-12-01), Sutherland
patent: 4207915 (1980-06-01), Becker et al.
patent: 4244392 (1981-01-01), Griswold et al.
patent: 4244395 (1981-01-01), Griswold et al.

Affiliated with

Also associated with

Rating

Check valve does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Check valve, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Check valve will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1493113