Details:

Fisher™ 644 and 645 Actuators

Fisher 644 and 645 actuators are used to automatically control steam-driven boiler feedwater pumps (reciprocating or turbine). The 644 or 645 actuator, when used in combination with one of several push-down-to-close sliding-stem valves, forms a pump governor. 644 and 645 actuators may also be combined with push-down-to-open valves to be used as relief governors.

Specifications

ActuationManualCertificationsCUTRControl TypeOn/OffOperating TemperatureStandard TemperaturePower SourceManualValve TypeGlobe ValveOther ConfigurationsContact your local Emerson business partner or sales office to learn about additional specifications or options for this product.

Features

Steel and cast iron construction provides long service life.Few moving parts and easy access reduce maintenance and downtime.Spring adjustment is readily accessible without removing any parts.Direct-operated configuration provides fast speed of response.