Parameters / Specifications Model: 667/EZ Actuator Type: Spring‑opposed diaphragm actuator, reverse‑acting Series: Fisher Type 667 Diaphragm Actuators Sizes: Multiple sizes available (e.g., 30, 34, 40, 45, 46, 50, 60, 70, 76, 87) to match various valve applications Signal Pressure Range: Typical 3‑15 psig (0.2‑1.0 bar) or 6‑30 psig (0.4‑2.0 bar), depending on configuration Fail Action: Reverse‑acting (spring drives actuator to fail position when signal is lost) Diaphragm Travel / Stroke: Up to ~100 mm (4 in) depending on size Construction Materials: Cast iron/steel body and spring case; high-strength diaphragm; heavy-duty construction for durability and corrosion resistance Operating Temperature Range: Standard and low-temperature service versions; low-temperature service down to approx –58 °F (–50 °C) Applications: On/off or throttling operation of industrial control valves in chemical, petrochemical, power generation, and oil & gas industries Features: Integral mounting pad for valve positioners Internal air passage for improved actuator response Optional manual handwheel and travel stops Flexible size range and configurations for various valve applications