AT shut-off valves and valve assemblies

Approved to Factory Mutual (FM) Class 7400, 7420 and 7422, the AT shut-off valves and valve assemblies feature a spring-return automated ball valve, explosion-proof limit switch and solenoid pilot valve, advanced quarter-turn rack-and-pinion actuator design, superior valve seating, and a patented stem-seal system. The valves are available in three-piece models or flanged models, with Type 316 stainless steel or WCB carbon steel trim, in sizes from 1/4 in. to 6 in. The three-piece valves come with threaded, socket-weld or butt-weld end connections, while the flanged valves are available with 150# or 300# flange ratings. All have a live-loaded packing system featuring a 45-deg. pyramidal stem and stem seal with Belleville washers and chevron packing. This design provides excellent emissions control and received TA-LUFT low-emissions certification from the German TUV agency.