Membrane dryers from SPX offer a solution to users who require low dew point air at point of use. These dryers can operate without electrical power and offer exceptional operating reliability for the small to medium air user that requires dew point suppression without the use of electrical power.
The dryer only has no moving parts other than the drains on the pre filter pack. These membrane dryers do not affect the oxygen content of the dried air. Purge air may be vented to atmosphere with no treatment being required. Membrane dryers make use of some of the incoming air flow as purge air. When used in conjunction with a refrigeration dryer low dew points can be achieved for a variety of applications. The quantity of the purge air required depends on;
- The desired pressure dew point suppression.
- The inlet air temperature.
- The inlet air pressure.
The SPX DMD & DMM series membrane dryers may be fitted with an optional purge control valve that connects to a compressor’s on/off control system or a pressure switch to stop the purge in a “no flow” condition. This prevents compressed air wastage.