GN764 Breather Caps, Sheet Steel, with Filter, with Double Valve

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Options

Type F - with filter

Type FD - with filter and double valve (only for d₁ = 81)

Product Description

GN764 Breather Caps, Sheet Steel, with Filter, with Double Valve

Breather caps GN 764 are available either with a thread or with a bayonet connection. For the version with bayonet and filler strainer 6 slot head screws M5 x 10 are part of the order.

Breather caps GN764 with double valve are normally used if the oil container is under pressure to allow outside air to flow back in to compensate for vacuums caused by falling oil levels. 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. The air filter prevents the oil from outside pollution, for example with dust.

The filter is made of PU foam with a filtration of 40 µm. The overpressure inside the containers 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. Also, a container under pressure has a positive effect on the function of the pump and prevents foaming. The valve seal ensures that no oil will leak even if the oil is heavily agitated or during transport. For further function and operational criteria of breather plugs breather caps GN764 with double valve (Type FD) see function description in Technical Data.

Specification

Steel (sheet metal)

Cap - chrome plated. Other parts steel zinc plated

Seal - Rubber NBR (Perbunan®)

Air filter - PU-foam, (Polyurethane), filtration 40 µm, temperature resistant up to 115 °C

Pressure spring - Stainless steel

On Request

Type FD with other opening pressure

Threaded version with dipstick