Application
The TM-25/200LP actuators provide25 mm (1 inch) of linear movement of valves for steam or gas turbines. Description
The TM-25LP and TM-200LP actuators are electric-hydraulic, proportional actuators for positioning steam and fuel-control valves requiring low/high force linear inputs.
Factory setting determines if the actuator output shaft extends or retracts on increasing current.
Features
The actuators have aluminum cases and through-hardened stainless-steel internal parts. A 40 µm low-capacity screen is provided in the supply inlet fitting to protect the torque motor servovalve in case of failure of the external filter.
The units will operate with either centrifugal or fixed-displacement type pumps providing hydraulic pressure. The actuators are calibrated at the factory for bias in the minimum-fuel direction in event of the loss of input current.
A dual-coil torque motor is optional for redundancy. The dual-coil actuator has an optional position-feedback transducer.
For more information, refer to Woodward Manual 82450.