Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Patent
1979-10-04
1982-02-02
Cohan, Alan
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
137492, 13750534, G05D 1600, F16K 31365
Patent
active
043134602
ABSTRACT:
A pilot valve designed to regulate a main liquid flow valve disposed in a fluid system is disclosed having a diaphragm and sliding poppet assembly which is biased in one direction by a reference force and movable in the opposite direction in response to variances in regulated pressure sensed upon the diaphragm. The pilot valve includes integrally formed self-cleaning restrictors which dampen the operation of the valve to eliminate chatter as the pilot valve throttles to maintain the desired liquid flow level in the fluid system. Stability during operation is provided by a positive feedback force being applied to the pilot poppet which is of the same magnitude as the pressure which positions the valve member of the main flow valve. This positive feedback force significantly reduces phase lag between the pilot and the main flow valve, thereby increasing valve response to load changes. The pilot valve may also be utilized in both pressure reducing and back pressure monitoring applications by the mere substitution of three internal parts, namely the valve seat insert, guide and a plunger or poppet.
REFERENCES:
patent: 2877791 (1959-03-01), Rich
patent: 3753547 (1973-08-01), Johnson
Cohan Alan
JH Industries, Inc.
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