Breather Caps GN 764 (SMN. / SMN-BA / SMW. / SMW-BA)

Breather Caps GN 764: Steel, with Filter, with Double Valve

Original design
code: SMN. / SMN-BA / SMW. / SMW-BA

Bildvariante: G - Thread

Plastic Characteristics

Product description

Function and operational criteria of breather caps GN 764 with double valve (Type FD) see description of function.

For the version with bayonet and filler strainer, slotted head screws are part of the order.

Specification

Breather cap

Upper part (cap)
Steel sheet metal, chrome plated
Flange
Steel sheet metal, zinc plated
Threaded part
Steel, zinc plated

Seals
Acrylonitrile butadiene rubber (NBR)

Air filter
PU-foam, polyurethane
Filtration 40 µm

Filter spring for type F
Stainless steel

Double valve for type FD

Pressure relief valve
Plastic with O-ring
of acrylonitrile butadiene rubber (NBR)
Vacuum relief valve
Plastic gasket with O-ring
of acrylonitrile butadiene rubber (NBR)
Pressure spring stainless steel

Filler strainer for version BA
Steel,
Galvanic zinc plated, black

Slotted head screws DIN 7971 for version BA
Steel
Zinc plated, blue passivated

Operating temperature-30 °C to +100 °C

RoHS

Accessory

GN 7490 Welding Sockets

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d₁	d₂ Thread		Bayonet	d₃	d₄	d₅	d₆	l₁	l₂	l₃	l₄	l₅ ≈	l₆	A/F	Opening pressure in mbar Type FD

47	G 1/4	1/4 NPT	BA	7	52	40	27	10	5	51	35	13	66	17	-
81	G 3/4	3/4 NPT	BA	17	83	72	49	16	12	70	42	17	80	30	350

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GN 764 Breather Caps Steel, with Filter, with Double Valve

Product description

Specification

Accessory

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Description of Function

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F	With filter
FD	With filter and double valve (only for d₁ = 81)


Breather caps GN 764 feature a double valve and are used for venting vessels, such as hydraulic tanks. The valve limits the overpressure inside the vessel by releasing air whenever the pressure value specified in the table is exceeded. Conversely, the valve allows air to enter into the vessel once an underpressure of -30 mbar is reached, preventing the formation of a vacuum. The respective flow rate depends on the pressure difference and can be read from the diagram. The integrated air filter prevents dust and dirt from entering the vessel. With fluctuating liquid levels, the overpressure reduces the air exchange, resulting in reduced filter contamination, especially in dusty environments. The pressurized air pocket above the liquid counteracts foam formation. The valve seal ensures that no liquid escapes, such as due to vigorous movements or during transport.