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Fisher™ 644 and 645 Actuators
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.
Fisher™ 644 and 645 Actuators

Specs

Actuation
Manual
Certifications
CUTR
Control Type
On/Off
Operating Temperature
Standard Temperature
Power Source
Manual
Valve Type
Globe Valve
Other Configurations
Contact 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.