Check valve

Details Check valve Check valve

1987-06-25

1988-08-30

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Direct response valves

F16K 1502

Patent

active

047669292

ABSTRACT:
An improved check valve is disclosed, which prevents the valve disk from slamming against the valve seat when the fluid flow in the line is suddenly reversed. The valve includes a disk and a seat, the disk being movable towards and away from the seat in response to pressure changes in the line. The disk, together with a central member, defines a chamber which becomes filled with fluid when the disk moves away from the seat. When the direction of flow in the line is suddenly reversed, causing the disk to move back towards the seat, the disk is cushioned by the fluid in the chamber, and does not slam against the seat. In one embodiment, an orifice is provided, spaced apart from the central bore of the valve, through which the fluid in the chamber can slowly and steadily leak out. In another embodiment, the orifice is provided in the disk of a pilot valve, which is a small check valve mounted at the inlet end of the main valve. In either embodiment, the orifice causes fluid to leak out of the chamber in a controlled manner. The fluid in the chamber therefore acts as a dashpot to retard the movement of the disk towards the seat. The amount of damping of the dashpot is determined by the size of the orifice.

REFERENCES:
patent: 328979 (1885-10-01), Schutte
patent: 915624 (1909-03-01), Perkins
patent: 2927604 (1960-03-01), Johnson

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