Flowserve PMV P3 Manual do Utilizador descarregar pdf (Página 12)

12

Single action positioner

Actuator with closing spring, flapper

nozzle set for reverse function

When the signal from the I/P unit

increases, the pressure C+ to the actuator is

increased. The valve stem moves upwards.

Actuator with closing spring, flapper

nozzle set for direct function

When the signal from the I/P unit

increases, the pressure C+ to the actuator is

reduced. The spring forces move the valve

stem downwards.

Actuator with opening spring, flapper

nozzle set for reverse function

When the signal from the I/P unit

increases, the pressure C+ to the actuator is

increased. The valve stem moves

downwards.

Actuator with opening spring, flapper

nozzle set for direct function

When the signal from the I/P unit

increases, the pressure C+ to the actuator is

reduced. The spring forces move the valve

stem upwards.

S

C+

S

C+

S

C+

S

C+

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