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ADJUSTMENT WITH MOTORIZED VALVE

In an adjustment process the adjustment valve has the function of varying fuel delivery

(frequently corresponding to the thermal energy introduced into the process )in relation to

the Signal coming from the controller.

For this purpose it is provided with an actuator able to modify its opening value overcoming

the resistances produced by the fluid passing inside it

The adjustment valves vary the delivery in a modulated manner producing finite variations in

the fluid passage inner area corresponding to finite and a mechanical transmission system

which actions the valve.

Various auxiliary components can be present such as the mechanical and electrical safety end

travels, manual actioning systems position location.

The controller determines , on the basis of the dynamics of the process, the control output

for the valve corresponding to the opening of the same in such a way so as to maintain the

desired value of the process variable.

With counter reaction valves the position is normally provided by a potentiometer assembled

ot the actuator.