Pilot valve for control valves and method of operation

Details Pilot valve for control valves and method of operation Pilot valve for control valves and method of operation

1990-06-04

1991-07-02

Cohan, Alan

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

1376275, 13759618, G05D 1606

Patent

active

050278525

ABSTRACT:
A pilot valve (40) for a control valve (14) has a separate auxiliary source of high pressure fluid (106) for the operation of the pilot valve (40). The dome chamber (36) of the control valve (14), the inlet fluid chamber (72), and the intermediate fluid chamber (104) are exposed only to the auxiliary source of fluid (106). Thus, process fluid from the sensing line (62) does not contaminate the spool valve (76) or the dome chamber (36).

REFERENCES:
patent: 3730214 (1973-05-01), Brumm
patent: 4609008 (1986-09-01), Anderson
patent: 4791955 (1988-12-01), Reip
patent: 4875502 (1989-10-01), Romano
patent: 4917144 (1990-04-01), Giles

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