Fisher 657 Diaphragm Actuator Size 40 0.4 to 2.0 bar (6 to 30 psig)
Buy Fisher 657 diaphragm actuator (Size 40, 0.4 to 2.0 bar (6 to 30 psig)). Fail-open/fail-closed pneumatic positioning for control valves. In stock, brand new, factory-direct price, ships within 48 hours.
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Engineered for reliable control-valve positioning, the Fisher 657 (Size 40, 0.4 to 2.0 bar (6 to 30 psig)) applies air pressure to the upper diaphragm casing to drive the stem downward against the spring. It provides fail-open action on push-down-to-close valves and fail-closed action on push-down-to-open valves, with 38 mm travel and 445 cm2 diaphragm area.
Key Features
- Split-block stem connection for solid motion transfer
- Maximum allowable thrust 12010 N
- Temperature range -40 to 82 C standard, to 149 C with silicone diaphragm
- Top- and side-mounted handwheels available
- SIL3 capable, certified by exida
- Direct-acting, spring-opposed design for fail-safe positioning
Wholesale Pricing, Genuine & In Stock
Bulk and OEM pricing on Fisher 657 diaphragm actuators, all 100% original and brand new. Ready stock, 48-hour dispatch, and a full 1-year warranty. We quote volume orders within 12 hours.
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Email: sales@gt-exim.com | WhatsApp: +86 17719526488
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