Technical Specifications Category Specification Model 627WH Type Pneumatic Spring-and-Diaphragm Rotary Actuator Key Features Weather-Resistant (W) & High-Temperature (H) Action Spring-Return (Single-Acting) Standard Travel 90 degrees Air Signal 3 to 15 psig (0.2 to 1.0 bar) standard. Spring Ranges Available in multiple ranges (e.g., 3-15 psig, 6-30 psig, 9-45 psig). Temperature Limits Standard (with High-Temp Kit): Up to +200°F to +250°F (+93°C to +121°C) or higher. The exact limit depends on the specific high-temperature diaphragm and grease used. Torque Output Varies by actuator size and air supply. Fail-Safe Yes (inherent to spring-return design). Mounting Direct mounting to Fisher and other manufacturers' rotary valves. Diaphragm Material High-Temperature Elastomer like Viton or EPDM. Housing Material Coated Cast Iron or Aluminum.
