Flowserve PMV D3 Digital Positioner Manuel d'utilisateur télécharger pdf (Page 11)

11

Single action positioner

(Direct function)

Actuator with closing spring

When the control signal increases, the

pressure C+ to the actuator is increased. The

valve spindle moves upward and rotates the

positioner spindle counter-clockwise. When

the control signal drops to zero, C+ is vented

and the valve closes.

Actuator with opening spring

When the control signal increases, the

pressure C+ to the actuator is reduced. The

springs press the valve spindle upward and

the positioner spindle rotates counter-

clockwise. When the control signal drops to

zero, C+ is vented and the valve opens.

Double action positioner

(Direct function)

Double action actuator

When the control signal increases, the

pressure C+ to the actuator is increased. The

valve spindle is pressed upward and rotates

the positioner spindle counter-clockwise.

When the control signal is reduced, the

pressure C- to the actuator increases and the

valve spindle is pressed downward. If the

control signal disappears, the pressure goes

to C-, C+ vents, and the valve closes.

C–

S

C+

C–

S

C+

C–

S

C+

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