Flowserve Mechanical and Hydraulic - Manual (Page 9)

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Mechanical and Hydraulic Overrides FCD LFENIM0004-00-AQ – 05/15
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2.1.2.1.3 Operate the handwheel counterclockwise (CCW) to open the valve (both on fail close and fail open actuators).
NOTE: The spring constantly loads the screw and it returns the actuator to fail-safe position when the jackscrew is retracted
(rotating clockwise (CW) on a fail close actuator and rotating counterclockwise (CCW) on a fail open actuator).
2.1.2.2 Restoring Automatic Operation
To restore the automatic operation:
2.1.2.2.1 Operate the handwheel in order to completely retract the jackscrew (rotating clockwise (CW) on a fail close actuator and
rotating counterclockwise (CCW) on a fail open actuator) and lock the position with the safety lock 1 .
2.1.2.2.2 Restore the supply pressure inside the actuator’s cylinder.
2.1.2.2.3 Operate actuator normally with supply pressure.
2.1.2.2.4 Check that the actuator is able to reach the fully close position in case of fail close actuator or the fully open position in case
of fail open actuator. It is possible to check the fully-stroked position by viewing the position indicator or limit switches,
if fitted. If the actuator is not able to fully stroke in fail-safe direction, verify that the jackscrew has been totally retracted,
rotating it as described in step 2.1.2.2.1.
1 The safety lock is only available upon request. Please contact your local Flowserve Limitorque Representative for more information.
2.1.3 Operation – Enclosed Jackscrew Override Installed on Double-Acting Actuator
Figure 3 – LPS Double-Acting with Enclosed Jackscrew Override (Declutchable)
2.1.3.1 Manual Operation
a CAUTION: prior to operating the actuator by mean of manual overrides, be sure to remove the pressure inside the cylinder and
that the cylinder has been vented to atmosphere through the venting ports. Ensure that all vent valves are in vent position. The
number of these valves varies as per the actuator and control schematic types.
To manually operate the override:
2.1.3.1.1 Remove the supply pressure inside the actuator’s cylinder, and vent the cylinder ports.
2.1.3.1.2 Rotate the lever on the manual override from “DISENGAGED” to “ENGAGED” position (see Figure 4).
2.1.3.1.3 Operate the handwheel clockwise (CW) to close the valve.
2.1.3.1.4 Operate the handwheel counterclockwise (CCW) to open the valve.