Timer-controlled electronic drain valves are less expensive than
no-loss and ball valve drains. Most electronic drain valves let you
set the drain to come on once every 10 seconds to 45 minutes and
remain open for 0.10 to 10 seconds.
The next thing to consider is the pressure you are operating at
and the air's temperature. Drain valves for high temperatures and
pressures are readily available. The Optimum High Pressure series
goes up to 6,000 PSI. The valve body material is normally brass or
bronze or stainless. Stainless steel valves are commonly used in
corrosive environments, sanitary applications, and in systems piped
in stainless. If chemical compatibility is a concern with your
process be sure to check the valve body material. Some drains like
the Optimum series are NEMA4.