Norman G Clark offer pneumatic drain valves for air purification. The Expello Pneumatic Drain Valves are fitted to each Stark air dryer/air purifier. The Expello Pneumatic Drain Valve is actuated either by an electrical signal or pneumatically by the unloading of the compressor.
The Expello Pneumatic Drain Valves can also be purchased independently and used as a dump valve for vehicle wet tanks, accumulator tanks for compressed air or any other part of the compressed air system that requires a drain valve where moisture may accumulate.
The Expello Pneumatic Drain Valves operate by expelling harmful contaminants from the compressed air system with a short sharp powerful blast of air. Heated Expellos are available for cold environments where the moisture may freeze blocking the dump point.