Flowserve Mechanical and Hydraulic - Manual (Page 15)

15
Mechanical and Hydraulic Overrides FCD LFENIM0004-00-AQ – 05/15
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2.3.1.3 Tighten the seal nut.
2.3.1.4 Pneumatically stroke the actuator several times to assure proper operation. The stem adaptor should not bind during
operation. If the actuator is equipped with limit switches, positioners or other accessories, adjust them at this time.
2.3.2 Operation – Bevel Gear Override Installed on LPS Single-Acting Actuator
Figure 9 – LPS Single-Acting with Bevel Gear Override
2.3.2.1 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:
2.3.2.1.1 Remove the supply pressure inside the actuator’s cylinder, and vent the cylinder ports.
2.3.2.1.2 Operate the handwheel clockwise (CW) to close the valve (both on a fail close actuator and on a fail open actuator).
2.3.2.1.3 Operate the handwheel counterclockwise (CCW) to open the valve (both on a fail close actuator and on a fail open actuator).
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).
2.3.2.2 Restoring Automatic Operation
To restore automatic operation:
2.3.2.2.1 Operate the handwheel in order to completely retract the jackscrews (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 .
2.3.2.2.2 Restore the supply pressure inside the actuator’s cylinder.
2.3.2.2.3 Operate actuator normally with supply pressure.
2.3.2.2.4 Check that the actuator is able to reach the fully closed 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 seeing the position indicator or limit switches,
if fitted. In case the actuator is not able to fully stroke, verify that the jackscrew has been totally retracted, rotating it as
described in step 2.3.2.2.1.
1 The safety lock is only available upon request. Please contact your local Flowserve Limitorque Representative for more information.