Servo-valve

Details Servo-valve Servo-valve

1988-09-13

1989-10-24

Rivell, John

Valves and valve actuation

Balanced valves

Reciprocating

2513352, F16K 3902

Patent

active

048756598

ABSTRACT:
In a servo-valve, a metal bellows (70) is fitted onto an end section (66) of valve stem (26,42) lying at a distance from the seal (22), one end of said metal bellows (70) being supported rigidly in housing (72), while its other end engages the end of the stem. The metal bellows (70) are located in a pressure chamber (62) which is connected by a condensate coil (74) to the valve intake (12), whereby the cross-sectional area of the metal bellows (70) is made to match the area of the passageway of the valve seat (16). In this way, it is possible to achieve an overall compensation of the forces at the seal (22) or a desired additional load in the closed or open direction.

REFERENCES:
patent: 907771 (1908-12-01), Fulton
patent: 1153681 (1915-09-01), Fulton
patent: 3414231 (1968-12-01), Kreuter
patent: 3613733 (1971-10-01), Machek
patent: 3627257 (1971-12-01), Stampfli
patent: 3800832 (1974-04-01), Umphenour et al.
patent: 3805835 (1974-04-01), Jansen
patent: 3858607 (1975-01-01), Baker
patent: 4029293 (1977-06-01), Meysenburg
patent: 4252296 (1981-02-01), Berg
patent: 4529164 (1985-07-01), Igashira et al.

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