Flowserve Actuator L120-10

This section is only applicable to thrust base applications. Occasionally the operator stem nut may need replacing if used in a threaded stem application on rising stem valves.

WARNING: Possible Hazardous Voltage. Turn power OFF before disassembling or removing the actuator from the mounting base. This will prevent accidental start-up during service to the unit.

WARNING: Potential High-Pressure Vessel. Before removing or disassembling the actuator, ensure that the valve or other actuated device is isolated and not under pressure.

a CAUTION: The L120-10 through 40 thrust base contains lubrication. Ensure that EP-00 is replaced when reassembling thrust base.

NOTE: Installation and retention of O-rings and quad rings can be eased by applying a small quantity of EP grease to the ring during assembly.

1. Disconnect all incoming power to the actuator.

2. Remove actuator from the valve.

3. Remove Seal Retainer (piece 102 of Figure 6.2) followed by stem nut, bearings, and seals.

The L120 series actuators have a sealed gear case, factory-lubricated with grease. The thrust base, when supplied, is factory-lubricated with the same grease as the gear case if the stem nut is factorymachined for the customer's driven shaft. If a blank stem nut is installed in the thrust base, a tag is provided on the actuator advising that the base is not lubricated.

The gear case can be mounted in any position. However, mounting of the motor or the switch compartment in the down position is not recommended. These mounting positions may result in the motor or switch compartment being saturated with lubricant if the seal fails.

No seal can remain absolutely tight at all times. Therefore, it is not unusual to find a very small amount of weeping around shaft seals—especially during long periods of idleness such as storage. Using grease minimizes this condition as much as possible. If a small amount is weeping at start-up, remove it with a clean cloth. Once the equipment is operating on a regular basis, the weeping should stop.

Inspect Limitorque L120 series actuators for correct lubrication prior to operating - particularly following a long storage period.

Each application has its own effect on the actuator and the frequency of these inspections should be based on the application and the operating experience. The following lubrication inspection schedule is recommended until operating experience indicates otherwise.

For the Gear Case, inspect lubrication every 18 months or 500 cycles, whichever occurs first.

During an inspection consider the following:

• Quantity – Ensure there is enough lubricant so that the Worm and the Worm Gear are totally immersed in grease regardless of the position.