PB_VA-7700_Electricl Valve Actuators_02 2011
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Self■adjusting■proportional■actuators■
Easy, quick and precise commissioning servicing
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Column■of■5■Light■Emitting■Diodes
Allows easy visualisation of actuator stroke position and of the actuator status
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Optional■models■with■mechanical■manual■override
Allows manual positioning independent of the power supply
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Manual■contact■micro■switch■on■all■models■with■manual■override
Signals actuator mode status (automatic or manual) to external supervisory system.
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IP54■protection■class
Allows installation in a wide range of environments
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Unique■“C”■shaped■yoke■design
Allows lateral mounting of the actuator reducing the vertical space over the valve needed for
installation.
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Positioner■with■selectable■starting■point■and■span,■direct■and■reverse■action■modes
Enables sequence control
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Magnetic■clutch
Provides constant output force for close-off of valves, and protects motor in stall conditions
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Control-Signal■failure■”■stem■to■pre-determined■position
Actuator pre-set position after a control signal failure (extended/retracted), is selectable in-situ
The VA-77xx Series synchronous motor driven actuator, for
valves in heating, ventilation and air conditioning applications,
is available for floating (3-point) control or proportional control
with 0-10 V position feedback signal.
It provides a stroke capability of 8 mm to a maximum 20 mm.
This compact, non spring return actuator has a 500 N nominal
force and responds to a variety of input signals.
The actuator can be combined with VG7000, VG9000
and VGS8… valves in accordance with the maximum
close-off pressure ratings specified
(see pertinent valve
product bulletins).
They can be ordered as a separate unit or as a factory fitted
valve / actuator combination.
VA-7700■Series
Electric■Valve■Actuators