Norman G. Clark - The Expello Pneumatic Drain Valve is fitted to each Stark Air Dryer/Purifier. It is actuated either by an electrical signal or pneumatically by the unloading of the compressor.
The Expello valve 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 where moisture may accumulate.
The Expello operates 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