Flowserve LPC Compact Actuator Series - Manual (Page 8)

2.2 Connection With Valve and Mounting Kit
The LPC actuator is usually supplied with the spool piece already assembled. To assemble the actuator onto the valve,
perform the following steps:
1. Check the mounting surfaces, the stem adaptor and the spool piece to assure the proper fit. Clean the flange of the
valve and spool piece to remove oils and greases since the torque is transmitted by friction. Also remove any rust
that may have occurred during the storage.
2. Secure the valve in the closed/open position, if possible, with the stem vertical. Lubricate the valve stem in order to
ease the assembly. Place the stem adaptor on the valve stem.
3. Lift the actuator using a proper lifting system. Position the actuator over the valve and lower to engage the stem
adaptor to the actuator bore. Continue to lower until the spool piece sits on valve mounting surface. This coupling
has to take place without force and only with the weight of the actuator. The mounting bolts (or studs) of the valve
should easily fit into the bolt holes of the spool piece without any binding. If needed, turn or stroke the actuator a few
degrees and/or adjust the actuator travel-stops.
4. The mounting nuts (or bolts) connecting the base of the spool piece to the valve flange must be evenly tightened
according to specific tables, available upon request to Flowserve After Sales Department.
2.3 Travel-stop Bolts and Accessories
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 LPC actuators have travel-stop adjustments in both the clockwise and counter-clockwise 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. Refer to Figure 15.
• Pneumatic cylinder stop (19): Loosen the hex nut (20) with a proper wrench. Screw or unscrew the stop (19), using
a proper Allen key, while keeping the hex nut stationary. Tighten the hex nut.
• Housing stop (19): Loosen the hex nut (20) with a proper wrench. Screw or unscrew the stop (19), using a proper
Allen key, while keeping the hex nut stationary. Tighten the hex nut.
Adjust the travel stop bolts of the actuator for the proper open and closed valve positions, per valve manufacturer’s
recommendations. Pneumatically stroke the actuator several times to assure proper operation. If the actuator is
equipped with a switch, positioner or other accessories, adjusts them at this time.
2.4 Pneumatic Supply Fluids
To prolong actuator life use only clean, dry pneumatic supply fluids. Lubricated fluids are not required; however, they
are recommended, particularly for high cycle applications. Do not use lubricated fluids with positioners, as they may
damage the positioner.
LPC Compact Actuator Series FCD LFENIM0002-00-AQ 07/14
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