FS3-ATEX valves ATEX approved valve for fl ameproof engine applications power to open (failsafe) with spring return to closed position (stop) to closed position (stop) when not powered. Approved when not powered. Approved for operation in T4, Zone 1, Gas for operation in T4, Zone 1, Gas Group IIC and Zone 21, Conductive Group IIC and Zone 21, Conductive Dust Group IIIC hazardous areas. Dust Group IIIC hazardous areas. FP valves FP2 - Air pressure to close / e to close / Automatic reset. Automatic reset. FP3 - Air pressure to open / FP3 - Air pressure to open / e to open / Spring to close (failsafe). Spring to close (failsafe) ailsafe). FM1 valves FM1 valves Basic manual push button shutdown Basic manual push button shutdo Basic manual push button shutdown and lever reset. Also available with a and lever reset. Also availab remote cable operated emergency remote cable operated emergency pull to stop T handle. pull to stop T handle. Butterfl y type air intake shutdown valves F Series shutdown valves 13