Normally Closed Electromechanical Safety Shut-Off Valves with Automatic Reset for Natural Gas Service. 3/4" (DN20) Valve Size. NPT Threaded Connection. Valve Cv: 19. Max Operating Pressure Differential: 125 PSIG. NEMA 4 General Purpose Cast Iron Body, 400 Stainless Steel Seat, Hardened Ductile Iron Disc, PEEK Follower Ring, Buna N O-Rings and Bumper. 115 VAC/60 Hz Actuator Motor with 6 Second Timing. Two Proof-of-Open Switches, Two Proof-of-Closure Switch. Right Top Assembly Position.