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1. (WO1994028341) PNEUMATIC OPERATED VALVE WITH STROKE TIMING

Pub. No.:    WO/1994/028341    International Application No.:    PCT/US1994/003943
Publication Date: Dec 8, 1994 International Filing Date: Apr 12, 1994
IPC: F16K 37/00
Applicants: COMBUSTION ENGINEERING, INC.
Inventors: MARRIOTT, William, David
DUFF, Winslow, Kevin
McDONALD, Francis, Xavier
Title: PNEUMATIC OPERATED VALVE WITH STROKE TIMING
Abstract:
A non-intrusive method for timing the full operational motion of a valve plug (26) in an electrically actuated, pneumatically operated valve (10). An actuation signal is sent to the valve actuator (54). A coil of wire (68) around the valve actuator solenoid (56), an accelerometer (70) on the solenoid slug (64), or a connection to a permanent pressure sensor (72), non-intrusively senses arrival of the actuation signal at the valve. The time measuring equipment (12) begins timing when the actuation signal is sensed. A laser valve motion sensor (74) then non-intrusively senses when the valve plug reaches a limit of motion. The time measuring equipment ends timing when the valve plug reaches a limit of motion. The time measuring equipment then records the elapsed time from the sensing of the arrival of actuation signal to the final limit of motion of the valve plug.