Fisher Diaphragm Actuator
Product Description
The Fisher 657 and 667 pneumatically operated diaphragm actuators use an air supply provided by a controller, positioner, or other source. Pneumatically operated control valve actuators are the most commonly used type of actuator, but spring-loaded diaphragm pneumatic actuators are most commonly specified due to their reliability and simplicity of construction.
Core Parameters
|
Actuation Method |
Spring return, linear |
|
Certifications |
Compliant with SILATEX, CUTR, PED |
|
Operating Temperature |
Low temperature, High temperature, Standard temperature |
|
Power Supply |
Manual |
|
Operation Mode |
Reliable on/off control or regulating control |
Product Features
Multiple action types to meet different valve control needs
A wide variety of types including:
657 Direct Action (Increasing air pressure pushes the diaphragm downwards and extends the actuator push rod)
667 Reverse Action (Increasing air pressure pushes the diaphragm upwards and retracts the actuator push rod)
Bidirectional Action (can be assembled into direct or reverse action actuators)
Stable Output Force
Net output force is the difference between the diaphragm force and the spring reaction force
Linear Control Performance
Diaphragm-type pneumatic actuators provide linear characteristics and a large stroke
Flexible Size Selection
The required output force and available supply pressure determine the actuator size
Simple and Reliable Structure
Diaphragm pneumatic actuators are simple, reliable, and economical
Application Areas
Oil and Gas
Liquefied Natural Gas
Chemical Plants
Refinement Systems
Power Plants
Our Advantages
We can provide initial technical support and subsequent installation guidance.
We can provide technical selection support and quotations based on your model (provide detailed parameters or nameplate photos).
We can provide spare parts and repair support based on your actuator model.
Genuine Fisher products with traceable certification.
Fast quotation within 24 hours.
All products come with a one-year warranty.
We offer global shipping services. We accept both large and small orders.
FAQ
Q: How do Fisher 657 and 667 differ?
A: The 657 actuator is direct-acting; the 667 is reverse-acting. These actuators are designed to give reliable on-off or throttling operation of automatic control valves. A selection of sizes is available for a vast range of applications.
Q: What is the primary function of an actuator?
A: An actuator can be defined as a device of a machine which is responsible for generating forces, torques or displacements when provided with electrical, pneumatic or hydraulic input signal, in a system (referred to as actuating system). The output response is generated in a controlled manner.
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