Flowserve Mechanical and Hydraulic - Manual (Page 14)

Mechanical and Hydraulic Overrides FCD LFENIM0004-00-AQ – 05/15
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2.2.3.2 Restoring Automatic Operation
To restore automatic operation:
2.2.3.2.1 Operate both handwheels clockwise (CW) in order to retract both jackscrews completely, and lock the position with the
safety lock 1 .
2.2.3.2.2 Restore the supply pressure inside the actuator’s cylinder.
2.2.3.2.3 Operate actuator normally with supply pressure.
2.2.3.2.4 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 stroke fully, verify that the jackscrew has been totally retracted by rotating it as
described in step 2.2.3.2.1.
1 The safety lock is only available upon request. Please contact your local Flowserve Limitorque Representative for more information.
2.3 Bevel Gear Manual Overrides (-BG)
Bevel Gear overrides consists of a bevel gearbox system mounted on the end flange of the actuator pneumatic cylinder.
Figure 8 – Bevel Gear Manual Override
The Bevel Gear override option is available for LPS-25 and LPS-30 single-acting versions.
2.3.1 Installation - Travel-Stop Bolts Adjustment Bevel Gear Override Installed on
LPS Single Acting Actuators
All actuated valves require accurate travel-stop adjustments at both ends of the stroke to obtain optimum performance and
valve seat life. Adjust the travel-stop bolts of the actuator for the proper open and close valve positions, per valve manufacturer’s
recommendations.
The Bevel Gear manual override (-BG) has travel-stop adjustment in one direction: valve open direction (in single acting fail-open) or
valve close direction (in single-acting fail close). The travel stop adjustment in the opposite direction must be performed in accordance
with the IOM of the actuator.
The +/- 5 degree adjustment feature provides shaft rotation from 80 to 100 degrees overall.
The adjustment of the travel-stops is performed in accordance with the following steps:
2.3.1.1 Loosen the seal nut with a proper wrench (Figure 8).
2.3.1.2 While keeping the seal nut stationary, screw or un-screw the travel-stop (Figure 8) bolt using a proper Allen key.
Travel Stop
Seal Nut