are supplied as separate unit integral with the actuator,
large thrust loads are provided with worm and worm
gear reduction. SMH can
be locked in open position or closed position as
desired.These valves can be
easily operated and maintained by the operators
standing on the ground.
Actuator for Throttling Application :
actuator can be equipped with Valve Positioner and actuator
spring with standard spring range to achieve positioner
actuators are either single or double acting type and
are generally preferred where ever air supply pressure
available is more. Double acting cylinder actuator is
generally preferred when fail safe position calls
for stay put operation in conjunction with air lock
relay or for heavy duty operation.
valve should be installed preferbly in a straight run
pipe a few diameters
away from the bends.The preferred position
is with actuator vertically above
or below the valve body, but it may be
installed in a horizontal or angled
position provided the diaphragm actuator is supported.
If necessary clearance should be provided above
the actuator to permit removal for servicing or
for inspection of the valve internals.