There are solenoid operated valves controlled by electric timers and float operated valves that do not require power (similar to steam traps). Neither work in freezing conditions. Solenoid valves Reducing Valvescan be mounted anywhere and a tube run to the lowest drain point. Float valves must be located under the air tank and that is sometimes difficultFirst choice: For aFilters cheap tank there is a number of tried and dependable suppliers of steam traps that would suit your purpose (Gestra, Spirax, Armstrong to mention a few) and drain the tank automatically when needed without external force (float operated) I do not believe you would place your tank or drain at freezing conditions: condensate would tend to freeze Forged Steel Valvesinside the tank, and you would create indoor pipeline condensation problems caused by great temperature differences. The second solution is either a pneumatic operated with spring return actuator, normally closed, smallAPI Cast Steel Valves ball valve, y-type seatvalve or membrane valve. Operation via a solenoide valve and timer. (Manual operation in addition should be present for start up and control) Do NOT use a solenoid valve Water power control valvesdirectly, as small particles and dirt inside the tank, plus water can clog and corrode the solenoide valve. Exception: some few solenoide valve constructions are built for the purpose, and can be safely installed.

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