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One simple, but effective solution is the mechanical pneumatic proportional valve. A small plunger is used to continually check the level. The position of the plunger is transmitted to the push valve. In accordance with the position, the air spring will be pumped up with or relieved of pressure. The level can be maintained constantly to within ± 1/10 mm. Principally three control valves are used. A pressure control valve to limit system pressure to a maximum of 6 bar, water trap to remove vapor and an air filter to remove dust and any foreign bodies from the air supply.
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