Flowserve Mechanical and Hydraulic - Manual (Page 8)

Mechanical and Hydraulic Overrides FCD LFENIM0004-00-AQ – 05/15
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2.1.1 Installation - Travel-Stop Bolts Adjustment Enclosed Jackscrew Override Installed on
Single and Double 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, according to Flowserve valve
manufacturer’s recommendations.
The Enclosed Jackscrew manual override (-JS) has a travel-stop adjustment in one direction: valve open direction (in double-acting
and 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:
2.1.1.1 Loosen the seal nut with a proper wrench (Figure 1).
2.1.1.2 While keeping the seal nut stationary, screw or un-screw the travel-stop (Figure 1) bolt using a proper Allen key.
2.1.1.3 Tighten the seal nut.
2.1.1.4 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 according
to their specific installation manuals.
2.1.2 Operation – Enclosed Jackscrew Override Installed on Single-Acting Actuator
Figure 2 – LPS Single-Acting with Enclosed Jackscrew Override
2.1.2.1 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:
2.1.2.1.1 Remove the supply pressure inside the actuator’s cylinder and vent the cylinder ports.
2.1.2.1.2 Operate the handwheel clockwise (CW) to close the valve (both on fail close and fail open actuators).