Valve Bench Set
Bench set is a very important parameter for a control valve because it establishes the seating force seat load of the plug against the seat when the valve is fully closed.
Valve bench set. If no bench set or spring loading is considered and the actuator is adjusted to move over the full range of its travel with a 3 15 psi air signal the process pressure can work against the actuator spring and actually force the valve plug to lift off of the seating surface allowing process fluid to pass through the valve instead of being closed. For direct or reverse acting valves push the valve stem down away from the actuator while mounting the actuator. Provide a vise or some other method of supporting the valve and the weight of the actuator during assembly.
The bench set pressure range is used to adjust the initial compression of an actuator spring with the valve assembly on the bench the correct initial compression is important for the proper operation of the valve actuator assembly when it is put into service and the proper actuator diaphragm operating pressure is applied. Bench set is a very important parameter for a control valve because it establishes the seating force seat load of the plug against the seat when the valve is fully closed. Control valve actuator bench set and valve stroking custom search actuator bench set.
Bench set consist of considering all the factors and forces selecting a spring with the correct spring rate and setting an initial compression on the spring. Here so at which valve starts to move is a bench set pressure here in our case bench set is 3 psi. The result is a control valve assembly that responds differently when tested on the bench than when it is installed in the process where all active forces are in effect.
Screw the stem locknuts all the way onto the valve stem. These settings are applied by. Proper seating pressure is critical for tight shut off which carries safety implications in some process services.
An actuator bench set is the instrument air pressure required to begin moving the stem against its closure spring and to fully stroke the actuator over its entire range. Bench set on a control valve is basicly on a pnumatic control valve it s the amout of air required to start to move a uncoupled actuator to full stroke. Example if the bench set on a valve.
