Relief valves with pilot valves

Details Relief valves with pilot valves Relief valves with pilot valves

1975-05-29

1976-04-27

Klinksiek, Henry T.

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

F16K 31383

Patent

active

039527719

ABSTRACT:
Piston type hydraulically balanced relief valves are disclosed except for one modification, utilizing pilot valves carried completely within the bodies of the relief valves or relief valve cartridges and wherein a single spring serves for closure of the relief valve and the respective pilot valve. All pilot valves are thus biased by a single spring primarily due to differential upstream and downstream areas both exposed to inlet pressure but with the upstream area larger and dominating. Accordingly, a single light biasing spring can suffice because of the reduced net opening force required, upon a predetermined rise in inlet pressure. The constructions afforded by such an arrangement are more compact than conventional pilot controlled relief valves wherein the relief and pilot valves are closed by separate and relatively heavy springs. Further, the advantage of the sensitivity of pilot controlled relief valves is realized together with effective damping and minimum control flow dependency. In all forms of the invention the pilot valve is of differential area construction, having front and rear, i.e., upstream and downstream, surfaces exposed to inlet pressure whereat a reduced net effective pressure force is in the opening direction. This is achieved by the simple expedient of having a front area exposed to inlet pressure in the opening direction but acting against inlet pressure on a somewhat smaller rear area.

REFERENCES:
patent: 3216443 (1965-11-01), Schmiel
patent: 3216446 (1965-11-01), Schmiel

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