Doc : Q066 Rev : 10
Issued : 01/11/13 Page : 8 of 25
e. Once the desired valve position has been achieved, disengage the manual override
by moving the lever on the handwheel frame mounting flange to the ‘DISENGAGED’
position.
f. Re-connect pneumatic supply connections.
10.2 Double-Acting Actuator with Handpump Type Manual Override
(See Section 16.8, Dwg. HYX-XXX-CYXXX-00-002-PL)
a. Isolate pneumatic supply, depressurise actuator and control system.
b. Remove tubing and fittings from actuator supply inlets to ensure that both sides of
the piston are free to ‘breathe’ to atmosphere.
c. Move the 3-way ball valve and cylinder link ball valve levers to the horizontal
position.
d. Move the handpump selector valve to the required flow direction.
e. Operate handpump until desired valve position is achieved.
f. Return 3-way ball valve, cylinder link ball valve and handpump selector valves to
automatic position.
g. Re-connect pneumatic supply lines.
10.3 Spring Return Actuator with Handwheel Type Manual Override
(See Section 16.7, Dwg. XXX-XXX-SHXXX-00-001-PL)
a. Isolate pneumatic supply, depressurise actuator and control system.
b. Remove tubing and fittings from actuator supply inlet to ensure that both sides of
the piston are free to ‘breathe’ to atmosphere.
c. Ensure actuator is in its fail position.
d. Rotate the handwheel anti-clockwise to open the actuator (for fail close ‘SRC’
actuators) or in clockwise direction to close the actuator (for fail open ‘SRO’ type
actuators).
e. Before restoring automatic hydraulic operation, rotate the handwheel in the opposite
direction to the above bullet in order to move the actuator to its fail position.
f. Reconnect pneumatic supply lines.
10.4 Spring Return Actuator with Handpump Type Manual Override
(See Section 16.9, Dwg. PNX-XXX-CYXXX-00-002-PL)
a. Isolate pneumatic supply, depressurise actuator and control system.
b. Remove tubing and fittings from actuator supply inlet to ensure that both sides of
the piston are free to ‘breathe’ to atmosphere.
c. Close the handpump stop valve by rotating its handle clockwise.
d. Operate handpump until desired valve position is achieved.
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