|Place of Origin:||Made In Mexico|
|Model Number:||657, 667|
|Minimum Order Quantity:||Negotiation|
|Packaging Details:||Wooden box|
|Delivery Time:||30 work-days|
|Payment Terms:||T/T, Western Union, MoneyGram|
|Supply Ability:||200sets Every Month|
|Name:||Fisher 657 And 667 Pneumatic Diaphragm Actuator||Model:||657,667|
|Actuation:||Spring-return, Linear||Control Type:||On/Off, Throttling|
|Power Source:||Pneumatic, Manual||Valve Type:||Angle Valve, Globe Valve|
fisher flow control valve,
fisher differential pressure regulator
Durable Fisher 657 And 667 Pneumatic Diaphragm Actuator For Control Valve
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.
The integral mounting pad eliminates the traditional mounting bracket and reduces the number of parts required to mount.
Incorporates an integral air passage that eliminates the need for external tubing and fittings when paired with a Fisher FIELDVUE™ instrument.
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.
Spring rates, travel stops, and manual operators are available for nearly any control valve application.
A molded diaphragm travels in a deep diaphragm casing, minimizing area change throughout the travel.
A shallow casing on the pressure side means reduced volume on that side, thereby minimizing response time.
The molded diaphragm allows maximum thrust for given diaphragm size.
Rugged thick-walled cast iron and steel construction provides increased stability and corrosion protection.
|Control Type||On/Off, Throttling|
|Power Source||Pneumatic, Manual|
Angle Valve, Globe Valve
Standard Operating Pressure Range
657 and 667: 0.2 to 1.0 bar (3 to 15 psig) or 0.4 to 2.0 bar (6 to 30 psig)
657-4 and 667-4: 0.2 to 1.9 bar (3 to 27 psig)
667 Size 76: 0.4 to 2.0 bar (6 to 30 psig) or 0 to 3.1 bar (0 to 45 psig)
Stainless steel disk or pointer and graduated scale
Operating Temperature Range
Standard Construction (Nitrile Elastomers): -40 to 82℃ (-40 to 180℉)
Optional Construction (Silicone Diaphragm): -40 to 149℃ (-40 to 300℉)
Maximum Valve Packing Box Temperature: 427℃(800℉) with cast iron yoke
Sizes 30- 60 and 667 Size 76: 1/4 NPT internal
Sizes 70 and 87: 1/2 NPT internal with 1/4 NPT internal bushing
657: 3/4 NPT internal with 1/4 NPT internal bushing
667: 1/2 NPT internal with 1/4 NPT internal bushing
Size 100: 1 NPT internal with 1/4 NPT internal bushing
Sizes 30 - 87: Steel
Size 80: Cast iron or steel
Size 100: Cast aluminum
Sizes 30 - 87: Nitrile on nylon, Silicone on polyester
Size 100: Nitrile on polyester
657 Sizes 30- 60, 100: Cast aluminum
657 Sizes 70 - 87: Cast iron or steel
667 Sizes 30 - 60, 100: Cast aluminum or steel
667 Sizes 70 - 87: Cast iron or steel
Actuator Spring: Steel
Spring Adjustor: Steel
Spring Seat: Steel or cast iron
Actuator Stem: Steel
Travel Indicator: Stainless steel
Seal Bushing: Brass
Stem Connector: Zinc-plated steel Yoke
Sizes 30 - 80: Cast iron or steel
Size 100: Steel
All 657 actuators are direct acting. Applying air pressure to the upper diaphragm casing forces the actuator stem downward. When this pressure is reduced, the opposing spring force moves the actuator stem upward. Should the loading pressure fail, the spring forces the stem to the extreme upward position. This provides fail-open action for push-down-to-close valves and fail-closed action for push-down-to-open valves.
657—A direct-acting actuator used on sliding-stem valves. Available in sizes 30 through 100.
657-4—A 657 actuator in sizes 70 and 87, designed with 102 mm (4-inch) travel.
All 667 actuators are reverse acting. Applying air pressure to the lower diaphragm casing forces the actuator stem upward against the opposing spring force. When this loading pressure is reduced, the spring moves the actuator stem downward. Should the loading pressure fail, the spring forces the stem to the extreme downward position. The actuators
provide fail-closed action for push-down-to-close valves and fail-open action for push-down-to-open valves.
667—A reverse-acting actuator used on sliding-stem valves. Available in sizes 30 through 100 and 76.
667-4—A 667 actuator in sizes 70 and 87, designed with 102 mm (4-inch) travel.
Contact Person: Barry