a solenoid valve and a timer
This type has a solenoid valve and a timer combined into one. The opening time and the interval time can both be set. For example it can be set to open for 2 seconds every 45 minutes. When buying a timed drain valve it is important to check the orifice size – a larger orifice will be more reliable as it is less likely to get blocked by contamination. Valves with larger orifice tend to cost more.They often have a strainer fitted immediately upstream. It is better if you can managed without a strainer as this becomes a maintenance item by itself. Rather fit a valve with a larger orifice and no strainer.
Pros – Very simple and normally reliable. Can be inexpensive compared to other types of automatic drain and avoids issues with air locks if the drain point is very near the ground.
Cons – Wastes compressed air. As you need to set the times for the worst conditions, the drain time will be generally longer than it needs to be so some compressed air will be exhausted as well as water. Over a 12 month period the cost of this lost air can be considerable. There are also maintenance issues with stainers and contamination and there is no easy way to monitor the operation of the drain or feedback data to building management systems.
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