GN 881Breather Valves

Breather Valves

Brass

GN 881

Catalogue
d1
Opening pressure
in mbar ±20%
d2
d3
e ≈
l1
l2
l3
A/F
GN 881-M12x1,5-200-MS-M
M 12 x 1.5
200
18
20
23.5
8.5
11.5
24.5
22
39
GN 881-M14x1,5-200-MS-M
M 14 x 1.5
200
20
20
23.5
8.5
11.5
24.5
22
44
GN 881-M16x1,5-200-MS-M
M 16 x 1.5
200
22
20
23.5
8.5
11.5
24.5
22
49
GN 881-M18x1,5-200-MS-M
M 18 x 1.5
200
24
20
23.5
8.5
11.5
24.5
22
52
GN 881-M20x1,5-200-MS-M
M 20 x 1.5
200
26
20
29
8.5
11.5
24.5
27
74
GN 881-M22x1,5-200-MS-M
M 22 x 1.5
200
27
22
29
8.5
11.5
24.5
27
79
GN 881-M24x1,5-200-MS-M
M 24 x 1.5
200
29
20
32.5
8
12
25
30
96
GN 881-M26x1,5-200-MS-M
M 26 x 1.5
200
32
20
34
8
12
25
32
112
GN 881-M30x1,5-200-MS-M
M 30 x 1.5
200
36
20
39
8
12
25
36
148
GN 881-G1/4-200-MS-M
G 1/4
200
20
20
23.5
8.5
11.5
24.5
22
42
GN 881-G3/8-200-MS-M
G 3/8
200
23
20
23.5
8.5
11.5
24.5
22
51
GN 881-G1/2-200-MS-M
G 1/2
200
26
20
29
8.5
11.5
24.5
27
76
GN 881-G3/4-200-MS-M
G 3/4
200
32
20
34
8
12
25
32
113
GN 881-G1-200-MS-M
G 1
200
39
20
44
8
12
25
41
186

Valve body

Brass MS

Breather cap

Stainless steel AISI 304 M

Gasket

Brass

with silicone-rubber coating (VMQ)

Spring

Stainless steel AISI 301

Seal DIN 7603 A

Soft iron 1.0338

Temperature resistant from -30 °C to +200 °C

Once the opening pressure given in the table is exceeded, breather valves GN 881 with gasket will vent into a container and so protect against excessive inside container pressure. A green colour ring marks the opening pressure of 200 mbar.

In its normal state, the gasket closes the container and so prevents dirt or dust getting inside the container.

The above diagram shows the air outlet as a factor of the opening pressure.

The installation position is vertical to the top.

The valves are checked for leak tightness and opening pressure.

Assembly instruction:

For mounting on walls of less than 4 mm thickness please use mounting nuts GN 7430

  • Other materials
  • With opening pressure 50 mbar (yellow ring)
  • With dipstick
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