Breather Caps GN 774.2 (SFW-P. / SFW-P+a)

Breather Caps GN 774.2: Plastic, with Filter, with Double Valve and Splash Guard

Original design SFW-P. / SFW-P+a

Type: A - Without dipstick

Level Markings / Special Lengths GN 109 (can be ordered as an option) Plastic Characteristics

Product description

Breather caps GN 774.2 are used when ventilation should only take place once the pressure exceeds or falls below a certain opening pressure. Further details on function and application criteria can be found in the Functional Description.

Breather caps can be fastened by means of a thread or combined with a filter strainer (GN 664 or GN 664.1). Line markings for monitoring the fill level can be easily applied to the dipstick surface.

Specification

Housing
Plastic, polyamide (PA)

Upper part (cap)
Orange, RAL 2004, matte finish
Lower part (threaded part)
Black, matte finish

Seal
Acrylonitrile butadiene rubber (NBR)

Air filter
Polyester
Filtration 10 µm

Dipstick for type B
Steel, phosphate-treated

Operating temperature -30 °C to +100 °C

RoHS

Accessory

Filler Strainers GN 664 (for Vertical Installation)
Filler Strainers GN 664.1 (for Side Mounting)

d₁	d₂		Opening pressure in mbar	d₃	d₄	l₁	l₂	l₃

42	-	M 16 x 1,5	350	11,5	40	11,5	36	194
42	G 3/8	-	350	13	40	11,5	36	194
42	G 1/2	M 20 x 1,5	350	15	40	11,5	36	194
42	G 3/4	-	350	21	40	11,5	36	194
57	G 3/4	-	350	19	56	13	47,5	190
57	G 1	-	350	26,5	56	13	47,5	190
70	G 3/4	-	350	20,5	68,5	16	59	190
70	G 1	-	350	26,5	68,5	17	59	191
70	G 1 1/4	M 42 x 2	350	33,5	68,5	17	59	191
70	G 1 1/2	-	350	40,5	68,5	17	59	191
70	G 2	-	350	51	68,5	17	59	191

d₁

d₂

Opening pressure
in mbar

d₃

d₄

l₁

l₂

l₃

M 16 x 1,5

350

11,5

194

G 3/8

350

11,5

194

G 1/2

M 20 x 1,5

350

11,5

194

G 3/4

350

11,5

194

G 3/4

350

47,5

190

G 1

350

26,5

47,5

190

G 3/4

350

20,5

68,5

190

G 1

350

26,5

68,5

191

G 1 1/4

M 42 x 2

350

33,5

68,5

191

G 1 1/2

350

40,5

68,5

191

G 2

350

68,5

191

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GN 774.2 Breather Caps Plastic, with Filter, with Double Valve and Splash Guard

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Accessory

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Breather caps GN 774.2 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 jerky movements or during transport.