Allen J Moore

US Patent:

42404630, Dec 23, 1980

Filed:

Jul 27, 1979

Appl. No.:

6/061497

Inventors:

Allen D. Moore - Marrero LA

Assignee:

Otis Engineering Corporation - Dallas TX

International Classification:

F16K 1700

US Classification:

1374925

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.