Type 3277 Pneumatic Actuators


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فایل ضمیمه

Actuator Type 3277 for direct attachment of accessories
Rolling diaphragm NBR/EPDM/PVMQ (175v2, 350v2, 355v2 and 750v2 cm² only)
Optional Manual adjuster, Travel stop, Combined version with handwheel and travel stops on both sides
Direction of action Actuator stem extends (FA), Actuator stem retracts (FE)
Signal pressure connection G .../... NPT

توضیحات محصول

Principle of operation
The signal pressure pst creates the force F = pst · A at the diaphragm
surface A which is opposed by the springs (10) in the
actuator. The bench range is determined by the number of
springs used and their compression, taking into account the
rated travel. The travel H is proportional to the signal pressure
pst. The direction of action of the actuator stem (7) depends on
how the springs are installed in the actuator and the location
of the signal pressure connection (S).
Actuators with 175v2, 350v2, 355v2 and 750v2 cm² actuator
areas are designed with a full rolling diaphragm (see
Fig. 10). The diaphragm of actuators with 240, 350 and
700 cm² actuator areas is clamped-in (see Fig. 9).
The stem connector (26) connects the actuator stem (7) with
the plug stem of the valve.
The adjustable mechanical travel stop (Fig. 13) is suitable for
actuators with actuator areas of 120, 175v2, 240, 350v2,
355, 700 or 750v2 cm². Using the travel stop, the actuator
travel can be limited by up to 50 % in both directions (actuator
stem extends or retracts) and permanently adjusted.
Direction of action
Actuators are available with the following directions of action:
–– Actuator stem extends (FA): the springs cause the actuator
stem to move to the lower end position (sectional drawings,
right) when the diaphragm is relieved of pressure or
when the supply air fails.
–– Actuator stem retracts (FE): the springs cause the actuator
stem to retract (sectional drawings, left) when the diaphragm
is relieved of pressure or when the supply air

محصولات مشابه