Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Patent
1980-07-25
1982-02-02
Cohan, Alan
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
251 57, F16K 3138
Patent
active
043134610
ABSTRACT:
A pressure intensifying system for low differential service particularly adapted for use in a gas transmission system which is conditioned to operate in response to pressure differentials. For example, where a pilot valve normally delivers a gas at regulated pressure to the jacket of an expansible tube main valve, the gas is here asserted against a diaphragm in the first of two cylinders in tandem. The diaphragm works against a spring to drive a piston in a smaller diameter, hydraulic cylinder, which delivers the liquid at pressures so intensified to the expansible tube valve jacket. When pressures are relatively high, the intensified liquid pressure ensures a seal, even at low differentials. Conversely, at low pressures which cannot overcome the spring, as when the jacket is being dumped, the piston is fully retracted and the hydraulic cylinder is vented to atmosphere. Hence, at low pressures only atmospheric pressure is asserted in the jacket.
REFERENCES:
patent: 3182971 (1965-05-01), Wakeman
patent: 3669142 (1972-06-01), Gerbic
patent: 4026513 (1977-05-01), Callenberg
patent: 4043533 (1977-08-01), Cowley
Cohan Alan
Grove Valve and Regulator Company
Stidham Melvin R.
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