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System Integrity: Acts as a secondary seal to protect the Schrader valve core from dust
22 and MSS SP104 specifications
and WeatherKing gas valves and control boards
Operating at 115Vac
Schneider Electric (Barber Colman) MK-4821 Pneumatic Valve Actuator Els PW 17895 System Integrity: Acts as aThe Schneider Electric MK 4821 is a professional grade pneumatic valve actuator designed for the precise positioning of 1 1 2" to 2" VB 9XXX series globe valves in commercial HVACR systems. Built for the rigors of mechanical rooms, this actuator features a rugged die cast aluminum housing and an 11 sq. in. effective diaphragm area. It operates on a proportional pneumatic signal with a nominal 8 to 13 psi spring range, ensuring reliable spring return
