Heating Maxitrol Maxitrol Selectra Gas Controls | 1/2″ Modulating Valve W/ By Pass Left

M Series Valves Are Designed To Operate On Indirect Fired Atmospheric Burner Applications. These Valves Function In The Same Manner As The Direct Fired M Valves. A Pressure Adjustment Spring Has Been Factory Set To Obtain An Outlet Pressure Slightly Above Atmospheric Pressure With The Bypass Closed And Zero Voltage Being Applied.