Parameters / Specifications Model: 667‑46i Actuator Type: Spring‑opposed diaphragm actuator, reverse‑acting Series: Fisher Type 667 Size: 46i diaphragm class Travel (Maximum Stroke): Up to 76 mm (~3.0 in) standard; up to 102 mm (~4.0 in) for extended stroke versions Signal Pressure Range: Typical 3‑15 psig (0.2‑1.0 bar) or 6‑30 psig (0.4‑2.0 bar) Operating Temperature Range: Standard –58 °F to +180 °F (–50 °C to +82 °C) depending on diaphragm material and configuration Construction Materials: Cast iron/steel body, molded diaphragm, heavy‑duty spring case Features: Integral mounting pad for digital valve positioners High thrust capability, linear response Optional manual handwheel, travel stops, and low-temperature variants Typical Applications: Sliding‑stem control valves, industrial process control requiring failsafe action and precision response Fail State: Spring drives actuator to fail position (commonly closed) on loss of supply signal Approximate Weight: Varies with size and accessories; typically tens of pounds (kilograms)

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