Model E Fuel Shutoff Valve · Diaphragm Operated 2-Way Gas Valve Max. operating temperature: 71°C, °F. Diaphragm working pressure: Min. 2-Way Nomally Closed. Low Temperature Gas Shutoff Valve (AC). Stainless Steel Body • 1/4" to 1" NPT. Features. • Ambient temperature range; ˚F to ˚ F. Safety for operator No clogging of ball valve Efficient use of calibration gas No shut - off Manual and actuator operation of ball valve Low temperature status.