High pressure abrasive slurry check valve

Details High pressure abrasive slurry check valve High pressure abrasive slurry check valve

1994-11-14

1996-01-09

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Direct response valves

13754323, F16K 1506

Patent

active

054820774

ABSTRACT:
A piston check valve for use in a system which conveys abrasive materials includes a gland nut which connects the valve to the piping system, a valve body mounted on the gland nut, a valve seat mounted on the valve body, and a piston mounted within the valve body. The piston can translate within the through bore of the valve seat and has a shaft and a head which contacts the first end of the valve seat when the valve is closed. A coil spring is located within the through bore of the valve seat and biases the valve closed. A first O-ring is mounted on the first end of the valve seat and is sufficiently wide to prevent sufficient quantities of chips from becoming lodged within the surface of the inner O-ring to form a hard bridge across the resilient O-ring, allowing erosion of the valve sealing surfaces. The first end of the valve seat has an O-ring groove which receives the O-ring. A second O-ring can be mounted on the first end of the valve seat at the outer periphery of the valve seat.

REFERENCES:
patent: 3051196 (1962-08-01), Miller
patent: 3701361 (1972-10-01), Bunn
patent: 4026322 (1977-05-01), Thomas
patent: 4371001 (1983-02-01), Olsen
patent: 4412792 (1983-11-01), LaBorde et al.
patent: 4862911 (1989-09-01), Yie
patent: 4908154 (1990-03-01), Cook et al.
patent: 5110463 (1992-05-01), Yuichi et al.
patent: 5241986 (1993-09-01), Yie

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