Control Valve Bench Set
It establish the seating force seat load of the plug against the seat when the valve is fully closed.
Control valve bench set. 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. Bench set is one of the important parameter for control valve. Hooke s law directly gives a relation between the applied force and the elasticity of the spring.
Screw the stem locknuts all the way onto the valve stem. 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. The control valve actuator bench set adjustment is setting the actuator spring loading on the bench before the actuator is coupled to the control valve before any of the forces mentioned above are introduced.
Proper seating pressure is critical for tight shut off which carries safety implications in some process services. 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. For direct or reverse acting valves push the valve stem down away from the actuator while mounting the actuator.
The pneumatic actuator operates on the principle of the hooke s laws to applied air pressure to valve stem position. Proper seating stress is critical for tight shutdown which in some process facilities has safety consequences. As already explained in control valve actuator bench set and valve stroking the bench set of a control valve is the pressure range required to stroke the valve from a fully closed to a fully open position.
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. Consult the manufacturer s instructions when adjusting. Given by below formula.
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. Provide a vise or some other method of supporting the valve and the weight of the actuator during assembly. During bench set spring adjustments.