As a noun, stroke is the full travel from closed to open, and stroke time is how long that takes. As a verb, stroking a valve means commanding it open and closed, watching the travel, timing it, and confirming the limit switches and position feedback match. Valves are stroked after maintenance, before startup, and on a schedule for shutdown valves.
Stroke XV-2104 from the board, I'll watch it in the field and call out when the open light comes in.
Also heard as
- stroke test
- full stroke
- travel
Related terms
Partial stroke test
Moving an emergency shutdown valve a small part of its travel while online, to prove it is not stuck.
Bench set
The air pressure range over which a spring-and-diaphragm actuator strokes the valve with no process pressure acting.
Actuator
The powered device that opens, closes or positions a valve using air, hydraulic oil or an electric motor.
MOV
Motor-operated valve: a valve driven by an electric actuator with a motor, gearbox, torque switch and limit switches.