Fisher 657 and 667 diaphragm actuators, 100% New & Original, low price promotion
2021-03-02 17:05:29
Description:
Fisher 657 and 667 spring-opposed diaphragm actuators position the valve plug in the valve in response to varying controller or valve positioner pneumatic output signals applied to the actuator diaphragm.……
New Products
Orbinox VG SERIES 61 Slurry knife gate valve
Orbinox SERIES 61 (VG) model knife gate valve is a wafer type valve equipped with two metal reinforced rubber sleeves,designed for applications with abrasive slurries.
Crosby J-Series Direct Spring Pressure Relief Valves
J-Series valves provide high quality and dependable overpressure protection for air, gas, steam, vapor, liquid and two-phase applications in one simple design. Now available with two new to the world technologies, Balanced Diaphragm and Bellows Leak Detection.
Vanessa Series 30,000 Cryogenic Triple Offset Valve
The Vanessa Series 30,000 Cryogenic Triple Offset Valve is a virtually maintenance-free valve with tightness, operability and torque demand unaffected by cryogenic conditions and severe temperature fluctuations.
Sempell Model SOT High pressure steam safety valve
The Sempell Model SOT is a high-pressure steam safety valve designed for boiler protection and steam system safety.
Assortments
Description
Fisher 657 and 667 spring-opposed diaphragm actuators position the valve plug in the valve in response to varying controller or valve positioner pneumatic output signals applied to the actuator diaphragm. Zero setting of the actuator is determined by the compression of the actuator spring. Span is set by both the actuator spring rate and the number of springs available. The 657 actuator is direct-acting; the 667 is reverse-acting. These actuators are designed to provide dependable on-off or throttling operation of automatic control valves.
Fisher 657 and 667 Features
● 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.
Fisher 657 and 667 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