Flowserve Mechanical and Hydraulic User Manual

Page 11

Mechanical and Hydraulic Overrides FCD LFENIM0004-00-AQ – 05/15

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The Not Enclosed Jackscrew is a simple manual override solution, consisting of a rotating and simultaneously sliding

externally-exposed screw, provided with handwheel.

Figure 5 – Not Enclosed Jackscrew Manual Override

The Not Enclosed Jackscrew option is available for the following models of LPS and LPC pneumatic actuator series:

• LPS-15 and LPS-20 single-acting versions

• LPC-05 and LPC-10 single-acting and double-acting versions

2.2.1 Installation - Travel-Stop Bolts Adjustment Not Enclosed Jackscrew Override Installed on

LPS/LPC Single Acting Actuators and LPC 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, per valve manufacturer’s
recommendations.

The Not Enclosed Jackscrew manual override (-JL) 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. For LPC Double Acting Actuators, manual override -JL have travel-stop in both directions.

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:

2.2.1.1 Loosen the seal nut with a proper wrench (Figure 5).

2.2.1.2 While keeping the seal nut stationary, screw or un-screw the travel-stop (Figure 5) bolt using a proper Allen key.

2.2.1.3 Tighten the seal nut.

2.2.1.4 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.

Travel Stop

Seal Nut