Flowserve LPC Compact Actuator Series - Manual (Page 12)

LPC series compact actuators are designed to offer the greatest ease of operations of assembly, disassembly and main-
tenance. The maintenance and disassembly do not require special equipment or special or large wrenches. Furthermore
the joints among the moving parts of the actuator are made exclusively through pins and then not using bolts to be
tightened with specific torques.
LPC compact actuators do not need maintenance for a long period, even if they are working in severe condition. The
lifetime of these actuators is guaranteed for 25 years with a regular and programmed maintenance operation every five
years. However, if the actuator operation happens infrequently, it is recommended to periodically check the actuator by
performing the following steps:
• In the plants, where it is possible, carry out a few opening and closing operations, involving all the control unit
components, checking that the actuator operates correctly and within the required stroking times.
• Check that all the signals (pneumatic and electric) arriving at the actuator are correct and that the supply fluid pres-
sure is within the required range. Check for the absence of leaks in the pneumatic connections. If necessary, tighten
the pipe fittings.
• Check the paint coating. If some areas are damaged due to accidental events, retouch them according to paint
procedure supplied along with the actuator documentation.
In case of scheduled preventive maintenance, or following accidental events, refer to the following maintenance
instructions regarding the main actuators components (pneumatic cylinder and housing).
4.1 General Disassembly Instructions
1. Disconnect all air and electrical supplies from actuator;
2. If removal of the actuator from valve is necessary, before dismounting the actuator, remove all accessories from
actuator.
3. The reference drawings for the instructions reported in the following paragraphs are exploded views of single acting
and double acting actuators, included as Figures 15.
4.2 Spring Container and Pneumatic Cylinder Maintenance
The pneumatic cylinder maintenance mainly consists in the replacement of all parts that may degrade in the course of
time, even in the absence of faults. These components are the o-rings and the sliding elements of the piston.
NOTE: In the LPC Compact Actuator Series, in single acting execution, the spring is located inside the
pneumatic cylinder, as shown in Figures 5 and 6.
a WARNING: Ensure that the pneumatic connection ports of the cylinder are disconnected. Also make sure that
all pneumatic supplies to the control unit and all power supplies are disconnected. Finally, make sure that
the actuator is in fail position, i.e. that it is not locked in a position with the spring compressed by means of
locking devices.
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Maintenance Instructions
LPC Compact Actuator Series FCD LFENIM0002-00-AQ 07/14
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