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Fisher 657 and 667 Diaphragm Actuators
Fisher 657 and 667 actuators are designed to provide dependable on/off or throttling operation of control valves. These spring-opposed diaphragm actuators position the valve plug in the valve in response to varying controller or valve positioner pneumatic output signals. The 657 actuator is direct-acting, while the 667 is reverse-acting.
Features
1.The integral mounting pad eliminates the traditional mounting bracket and reduces the number of parts required to mount.
2.Incorporates an integral air passage that eliminates the need for external tubing and fittings when paired with a Fisher FIELDVUE™ instrument.
3.Both 657 and 667 actuators are compatible with instruments that utilize traditional bracket-based mounting kits. The 667 can be externally tubed for instruments or accessories when required.
Specifications
Actuation：Spring-return, Linear
Certifications：SIL capable, ATEX, CUTR, PED
Control Type：On/Off, Throttling
Operating Temperature：Cryogenic, Low Temperature, Standard Temperature, High Temperature
Power Source：Pneumatic, Manual
Valve Type：Angle Valve, Globe Valve
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Application area
能源
化工
矿业
医药
