Timing versus actual liquid level
A timed valve opens at a set interval regardless of the amount of liquid. Too short an opening does not drain enough; too long an opening wastes air. A level-controlled solution responds to accumulated condensate, but still needs correct installation and maintenance. Electronic design does not automatically mean fault-free operation.
Every collection point has its own conditions
Filters, dryers and air receivers may have different pressures, condensate volumes and allowable backpressure. Incorrectly interconnected drains can affect each other. Treatment of the liquid downstream of the drain is a separate step; the drain itself does not remove oil from water.
What to check in practice
- Size capacity for the highest expected liquid inflow.
- Follow the specified slope, dimensions and backpressure for inlet and discharge lines.
- Provide access for function checks and any alarm.
Example scenario
In an illustrative case, a valve unnecessarily releases an average of 20 L/min of free air from an empty collection chamber for 4,000 hours per year. This totals 4,800 m³ per year. Calculate costs from actual specific energy consumption and electricity price, not just the duration of audible hissing.
What to watch out for
- Using a permanently partly open manual valve instead of proper drainage.
- Routing condensate against excessive backpressure.
- Leaving a drain exposed to freezing without a suitable solution.
How can I recognise a fault?
Warning signs include water passing beyond the collection point, continuous hissing or a level alarm. Follow the manual when checking the unit; before disassembly, it must be safely isolated and depressurised.