Steam valve with variable actuation forces

Details Steam valve with variable actuation forces Steam valve with variable actuation forces

1989-04-26

1990-05-29

Nilson, Robert G.

Fluid handling

Systems

Sequentially progressive opening or closing of plural valves

13763014, F16K 100

Patent

active

049287338

ABSTRACT:
A valve includes a device for reducing the force required beyond cracking, thereby reducing the size of actuating equipment. A balance chamber includes two effective diameters. A smaller diameter is operative during cracking, in order to maintain positive control of the valve. Later, a larger balance diameter is effective, in order to reduce the actuation forces required beyond the cracking position. A pilot valve is opened during initial actuation. Once the pilot valve is fully opened, a main valve is opened. A dual-diameter balance chamber is effective, during initial opening of the main valve, to require substantial opening forces. Then, when the main valve reaches a predetermined distance from its seat, the second effective diameter increases the balance area to reduce the valve actuating forces required.

REFERENCES:
patent: 2275132 (1942-03-01), Crosthwait
patent: 3529630 (1970-09-01), Podolsky
patent: 3531078 (1970-09-01), Hose

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