Fisher 657 Diaphragm Actuator
Manufacturer: Fisher — Fisher 657/667
Part number: 657
Category: Valves
Direct-acting spring-opposed diaphragm actuator for on/off or throttling operation of sliding-stem control valves.
Description
The Fisher 657 is a direct-acting, spring-opposed diaphragm actuator designed for dependable on/off or throttling operation of control valves. It positions the valve plug in response to varying controller or valve positioner pneumatic output signals. The integral mounting pad eliminates the traditional mounting bracket and reduces the number of parts required. An integral air passage eliminates the need for external tubing and fittings when paired with a Fisher FIELDVUE instrument. Compatible with instruments that utilize traditional bracket-based mounting kits. Spring rates, travel stops, and manual operators are available for nearly any control valve application.
Applications
- Globe valve actuation
- sliding-stem valve control
- direct-acting applications
- fail-closed service
- general process control
Industries
- Oil & Gas
- Refining
- Chemical
- Power Generation
- Pulp & Paper
- Mining
- Water & Wastewater
- Pharmaceutical
Available on request — pricing is quoted per enquiry. Request a quotation.