Fisher 657 and 667 actuators valves are designed to provide dependable on/off or throttling operation of actuators valves
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.
| 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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