Ganter Norm Standard Parts - Catalogue Page 1620
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Description of function 3.1 GN 764 Breather Caps continued This is achieved by combining two valves (non-return / bypass valve). The inlet valve opens at a vacuum of 30 mbar or greater. The second valves opens at an overpressure > 350 mbar. 3.2 Breather caps GN 764 with double valve are normally used if the oil container is under pressure and if outside air has to flow back in to compensate for the vacuum caused by falling oil level. The overpressure inside the container ensures that the air volume flowing in or escaping owing to fluctuations of the oil level is kept to a minimum. This reduces filter fouling and substantially increases the useful filter life, especially in a dusty environment. 3.3 The air filter prevents the oil from being polluted from the outside (dust). The filter is made of PU foam with a filtration of 40 μm. 3.7 3.6 3.5 The valve seal ensures that no oil will leak even if the oil is heavily agitated or during transport. 3.4 Also, a container under pressure has a positive effect on the function of the pump and prevents foaming. 3.9 3.8 Air flow rate [l/min] in reliance on the pressure difference Δp [mbar] container / outside space (Type F, with filter). Pressure curve Δp [mbar] in the container as factor of the air flow rate [l/min.] at a valve opening pressure of 350 mbar (Type FD, with filter and double valve) 3.5 Controlling, Venting, Sealing of Liquids and Gases | Page 1619
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