ACTUATORS - RP SERIES
Australian Pipeline Valve - Installation, Operation and Maintenance Manual
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b. Different pneumatic actuators have different air inlet sizes from 3/8” to 2” NPT. Using a smaller size
piping (or reduce orifice valves, solenoids, etc.) will reduce opening speeds.
Table 1 - Air Inlet sizes
c. To ensure quick operation of the actuator, do not use a smaller tube or fitting size than the inlet size
provided. Also valves with reduced orifices will reduce air flow.
d. Operating media is filtered dry air, if dew point is over -15°C use a dryer.
4.2 OPERATION
4.2.1 Auto-Operation on/off
On/off operation for pneumatic & hydraulic actuated valve:
A) The valve is open when solenoid valve is energised (fail close type)
B) The valve is close when solenoid valve is de-energised (fail close type)
C) The valve is close when solenoid valve is energised (fail open type)
D) The valve is open when solenoid valve is de-energised (fail open type)
4.2.2 Modulating-Control Operation
Modulating control pneumatic & hydraulic actuated control valve:
a) Input 4~20mA electric signals to the electro-pneumatic positioner, valve’s open degree is
proportionally regulated in 0°~90° stroke through different current size the positioner achieves.
b) Input 0.02~0.1MPa air signals to the pneumatic-pneumatic positioner, valve’s open degree is
proportionally regulated on 0‚~90° stroke through different air pressures the positioner supplies.
4.3 MANUAL OVER-RIDE OPERATION
Declutchable Worm Gear Manual Over-ride - DA Actuators
Double acting actuators are optionally available with a
declutchable worm gear manual over-ride (refer Figure 1 & 2).
Manual operating steps: firstly open the equalising valve on the
pneumatic actuator, draw out the pull pin of the gear operator
with one hand, simultaneously, use another hand to
turn the clutch lever counter clockwise, until the worm and the
worm gear engages, then release the pull pin. After the pin has
returned into the eccentric sleeve, you can then operate the
valve manually. Turn the handwheel clockwise to close the
valve, turn the handwheel counter clockwise to open the valve.
To return to automatic mode, first draw out the pull pin in the
gear operator with one hand, simultaneously use another hand
to turn the clutch lever clockwise until the worm and worm
gear
engages, then release the pull pin. After the pin has returned
into the eccentric sleeve, close the equalising valve.
Pneumatic Actuator
Open
Close
Manual
Override
Figure 1
Lock Pin
Clutch Lever
Figure 2
