Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Patent
1979-07-27
1980-12-23
Weakley, Harold W.
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
137488, 137498, F16K 1700
Patent
active
042404630
ABSTRACT:
A safety valve actuator and pilot system for emergency closure of a flow line for fluids such as oil and gas including a hydraulic valve actuator connected on a valve in a flow line for opening and closing the valve, a pressure sensing pilot valve communicating with the flow line for directing operating fluid into the hydraulic actuator in response to a predetermined pressure change in the flow line, a closed fluid storage system connected with the hydraulic actuator for containing exhausted operating fluid and redirecting the fluid back into the flow line, and flow connections for operating the actuator to reopen the safety valve. One form of the system operates directly from flow line pressure for response to the predetermined high pressure. Another form of the system includes an operating fluid storage tank and functions in response to either a high or high and low pressure in the flow line.
REFERENCES:
patent: 1893462 (1933-01-01), Wait
patent: 1918891 (1933-07-01), Barrett
patent: 2203243 (1940-06-01), Wettstein
patent: 2278952 (1942-04-01), Soderberg
patent: 2637946 (1953-05-01), Parks
patent: 2707483 (1955-05-01), Shafer
patent: 3227171 (1966-01-01), Woelfel
patent: 3788341 (1974-01-01), Athy
patent: 3991784 (1976-11-01), Gauo
Garland H. Mathews
Otis Engineering Corporation
Weakley Harold W.
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