Water ring vacuum pumps can experience either over-pumping or under-pumping

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Our water ring vacuum pumps have various problems. First, when changing the liquid, it is necessary to maintain a low liquid level – around 40 – in order for the pump to be able to draw air in; at levels above 100, the pump cannot function. If the level is lower than 40, the system immediately creates a vacuum and maintains a low pressure. Some require the liquid to be at full level before it can be drawn out. 2. Sometimes, when the pressure at the pump inlet is high, it is necessary to switch that balance valve back and forth in order to allow pumping to proceed; under normal conditions, it should be closed. 3. Sometimes, in order to meet the specified requirements, the vacuum pump must have its liquid continuously changed; it takes one or two hours to reduce the vacuum level by draining and filling the liquid, but after a few hours the vacuum level rises again and stabilizes at its original value. We have too many problems with our vacuum pumps; there are so many things we don’t understand. We need the experts to help answer these questions and provide some guidance in this area