Breather Valve Caps EN 774.2

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

Type: A - Without dipstick

Fluid Level Markings / Special Lengths GN 109 Plastic Characteristics

Product description

Breather valve caps EN 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 valve caps can be fastened by means of a thread or combined with a filler strainer (EN 664 or EN 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
-22 °F to 212 °F (-30 °C to +100 °C)

RoHS

Accessory

Filler Strainers EN 664 (Vertical Installation)
Filler Strainers EN 664.1 (Side Installation)

Part Number A - Without dipstick	Part Number B - With dipstick	d₁	d₂		Opening pressure in mbar	d₃	d₄	l₁	l₂	l₃


774.2-42-M16X1.5-A		1.65	-	M 16 x 1.5	350	0.45	1.57	0.45	1.42	-
	774.2-42-M16X1.5-B	1.65	-	M 16 x 1.5	350	0.45	1.57	0.45	1.42	7.64
774.2-42-G3/8-A		1.65	G 3/8	-	350	0.51	1.57	0.45	1.42	-
	774.2-42-G3/8-B	1.65	G 3/8	-	350	0.51	1.57	0.45	1.42	7.64
774.2-42-G1/2-A		1.65	G 1/2	-	350	0.59	1.57	0.45	1.42	-
	774.2-42-G1/2-B	1.65	G 1/2	-	350	0.59	1.57	0.45	1.42	7.64
774.2-42-M20X1.5-A		1.65	-	M 20 x 1.5	350	0.59	1.57	0.45	1.42	-
	774.2-42-M20X1.5-B	1.65	-	M 20 x 1.5	350	0.59	1.57	0.45	1.42	7.64
774.2-42-G3/4-A		1.65	G 3/4	-	350	0.83	1.57	0.45	1.42	-
	774.2-42-G3/4-B	1.65	G 3/4	-	350	0.83	1.57	0.45	1.42	7.64
774.2-57-G3/4-A		2.24	G 3/4	-	350	0.75	2.20	0.51	1.87	-
	774.2-57-G3/4-B	2.24	G 3/4	-	350	0.75	2.20	0.51	1.87	7.48
774.2-57-G1-A		2.24	G 1	-	350	1.04	2.20	0.51	1.87	-
	774.2-57-G1-B	2.24	G 1	-	350	1.04	2.20	0.51	1.87	7.48
774.2-70-G3/4-A		2.76	G 3/4	-	350	0.81	2.70	0.63	2.32	-
	774.2-70-G3/4-B	2.76	G 3/4	-	350	0.81	2.70	0.63	2.32	7.48
774.2-70-G1-A		2.76	G 1	-	350	1.04	2.70	0.67	2.32	-
	774.2-70-G1-B	2.76	G 1	-	350	1.04	2.70	0.67	2.32	7.52
774.2-70-G11/4-A		2.76	G 1 1/4	-	350	1.32	2.70	0.67	2.32	-
	774.2-70-G11/4-B	2.76	G 1 1/4	-	350	1.32	2.70	0.67	2.32	7.52
774.2-70-M42X2-A		2.76	-	M 42 x 2	350	1.32	2.70	0.67	2.32	-
	774.2-70-M42X2-B	2.76	-	M 42 x 2	350	1.32	2.70	0.67	2.32	7.52
774.2-70-G11/2-A		2.76	G 1 1/2	-	350	1.59	2.70	0.67	2.32	-
	774.2-70-G11/2-B	2.76	G 1 1/2	-	350	1.59	2.70	0.67	2.32	7.52
774.2-70-G2-A		2.76	G 2	-	350	2.01	2.70	0.67	2.32	-
	774.2-70-G2-B	2.76	G 2	-	350	2.01	2.70	0.67	2.32	7.52

Part Number
A - Without dipstick

Part Number
B - With dipstick

d₁

d₂

Opening pressure
in mbar

d₃

d₄

l₁

l₂

l₃

774.2-42-M16X1.5-A

1.65

M 16 x 1.5

350

0.45

1.57

0.45

1.42

774.2-42-M16X1.5-B

1.65

M 16 x 1.5

350

0.45

1.57

0.45

1.42

7.64

774.2-42-G3/8-A

1.65

G 3/8

350

0.51

1.57

0.45

1.42

774.2-42-G3/8-B

1.65

G 3/8

350

0.51

1.57

0.45

1.42

7.64

774.2-42-G1/2-A

1.65

G 1/2

350

0.59

1.57

0.45

1.42

774.2-42-G1/2-B

1.65

G 1/2

350

0.59

1.57

0.45

1.42

7.64

774.2-42-M20X1.5-A

1.65

M 20 x 1.5

350

0.59

1.57

0.45

1.42

774.2-42-M20X1.5-B

1.65

M 20 x 1.5

350

0.59

1.57

0.45

1.42

7.64

774.2-42-G3/4-A

1.65

G 3/4

350

0.83

1.57

0.45

1.42

774.2-42-G3/4-B

1.65

G 3/4

350

0.83

1.57

0.45

1.42

7.64

774.2-57-G3/4-A

2.24

G 3/4

350

0.75

2.20

0.51

1.87

774.2-57-G3/4-B

2.24

G 3/4

350

0.75

2.20

0.51

1.87

7.48

774.2-57-G1-A

2.24

G 1

350

1.04

2.20

0.51

1.87

774.2-57-G1-B

2.24

G 1

350

1.04

2.20

0.51

1.87

7.48

774.2-70-G3/4-A

2.76

G 3/4

350

0.81

2.70

0.63

2.32

774.2-70-G3/4-B

2.76

G 3/4

350

0.81

2.70

0.63

2.32

7.48

774.2-70-G1-A

2.76

G 1

350

1.04

2.70

0.67

2.32

774.2-70-G1-B

2.76

G 1

350

1.04

2.70

0.67

2.32

7.52

774.2-70-G11/4-A

2.76

G 1 1/4

350

1.32

2.70

0.67

2.32

774.2-70-G11/4-B

2.76

G 1 1/4

350

1.32

2.70

0.67

2.32

7.52

774.2-70-M42X2-A

2.76

M 42 x 2

350

1.32

2.70

0.67

2.32

774.2-70-M42X2-B

2.76

M 42 x 2

350

1.32

2.70

0.67

2.32

7.52

774.2-70-G11/2-A

2.76

G 1 1/2

350

1.59

2.70

0.67

2.32

774.2-70-G11/2-B

2.76

G 1 1/2

350

1.59

2.70

0.67

2.32

7.52

774.2-70-G2-A

2.76

G 2

350

2.01

2.70

0.67

2.32

774.2-70-G2-B

2.76

G 2

350

2.01

2.70

0.67

2.32

7.52

d₁	d₂		Opening pressure in mbar	d₃	d₄	l₁	l₂	l₃

1.65	-	M 16 x 1.5	350	0.45	1.57	0.45	1.42	7.64
1.65	G 3/8	-	350	0.51	1.57	0.45	1.42	7.64
1.65	G 1/2	M 20 x 1.5	350	0.59	1.57	0.45	1.42	7.64
1.65	G 3/4	-	350	0.83	1.57	0.45	1.42	7.64
2.24	G 3/4	-	350	0.75	2.20	0.51	1.87	7.48
2.24	G 1	-	350	1.04	2.20	0.51	1.87	7.48
2.76	G 3/4	-	350	0.81	2.70	0.63	2.32	7.48
2.76	G 1	-	350	1.04	2.70	0.67	2.32	7.52
2.76	G 1 1/4	M 42 x 2	350	1.32	2.70	0.67	2.32	7.52
2.76	G 1 1/2	-	350	1.59	2.70	0.67	2.32	7.52
2.76	G 2	-	350	2.01	2.70	0.67	2.32	7.52

d₁

d₂

Opening pressure
in mbar

d₃

d₄

l₁

l₂

l₃

1.65

M 16 x 1.5

350

0.45

1.57

0.45

1.42

7.64

1.65

G 3/8

350

0.51

1.57

0.45

1.42

7.64

1.65

G 1/2

M 20 x 1.5

350

0.59

1.57

0.45

1.42

7.64

1.65

G 3/4

350

0.83

1.57

0.45

1.42

7.64

2.24

G 3/4

350

0.75

2.20

0.51

1.87

7.48

2.24

G 1

350

1.04

2.20

0.51

1.87

7.48

2.76

G 3/4

350

0.81

2.70

0.63

2.32

7.48

2.76

G 1

350

1.04

2.70

0.67

2.32

7.52

2.76

G 1 1/4

M 42 x 2

350

1.32

2.70

0.67

2.32

7.52

2.76

G 1 1/2

350

1.59

2.70

0.67

2.32

7.52

2.76

G 2

350

2.01

2.70

0.67

2.32

7.52

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

Product description

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Breather valve caps EN 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.