In stock 1 available
The Fisher 657 pneumatic actuator is a spring-opposed diaphragm-style actuator used to position control valves in response to pneumatic signals. Size 30 is a mid-range actuator size suitable for globe and angle valves in throttling service. It provides reliable, linear motion with fail-safe positioning, and is often paired with Fisher control valves in process industries such as oil & gas, chemical, and power. Technical Specifications: • Model: Fisher 657 • Size: 30 • Actuator Type: Pneumatic diaphragm, spring-opposed • Action Type: - Direct-acting (air-to-extend / fail-closed) - Reverse-acting models available (air-to-retract / fail-open) • Diaphragm Area: 30 in² (approx. 194 cm²) • Signal Pressure Range: Typically 3–15 psi (0.2–1.0 bar); optionally 6–30 psi • Maximum Supply Pressure: 60 psi (4.1 bar) • Stroke: ¾ in (19 mm) standard • Thrust Output: - Up to 340 lbf (1.51 kN) depending on bench set and air supply • Bench Set (Spring Range): - Typically 8–13 psi or 9–15 psi (adjustable based on spring selection) • Mounting: - Direct to valve yoke (yoke boss or stem clamp) - Suitable for globe-style valves • Materials: - Housing: Cast iron or carbon steel - Diaphragm: Nitrile/nylon-reinforced elastomer - Spring: Coated carbon steel • Ambient Temperature Range: -40 °C to +82 °C (-40 °F to +180 °F) • Positioner Compatibility: Can be equipped with Fisher 3582i, 3610J, or DVC series digital valve controllers • Manual Override: handwheel • Fail-Safe Mode: Determined by spring orientation and piping (fail-closed or fail-open) • Weight: ~20–25 lbs (9–11 kg) depending on configuration
Condition: New – Open box
Weight: 170.00
Depth: 36.00
Length: 24.00
Width: 36.00
SKU: 46797 4.R7.3.4
Welcome 