Standard_Parts_Catalogue

Page 1622 | 3.5 Controlling, Venting, Sealing of Liquids and Gases GN 881 Breather Valves Brass 1 d 1 2 Opening pressure 3 Material (Valve body) 4 Material (Breather cap) How to order 1 2 3 4 GN881-G½-200-MS-M • Other materials • With opening pressure 50 mbar (yellow ring) • With dipstick On request 1 2 d 1 Opening pressure in mbar ±20% d 2 d 3 e ≈ l 1 l 2 l 3 A/F M 12 x 1,5 - 200 18 20 23,5 8,5 11,5 24,5 22 M 14 x 1,5 G 1 ⁄ 4 200 20 20 23,5 8,5 11,5 24,5 22 M 16 x 1,5 - 200 22 20 23,5 8,5 11,5 24,5 22 - G 3 ⁄ 8 200 23 20 23,5 8,5 11,5 24,5 22 M 18 x 1,5 - 200 24 20 23,5 8,5 11,5 24,5 22 M 20 x 1,5 - 200 26 20 29 8,5 11,5 24,5 27 M 22 x 1,5 - 200 27 20 29 8,5 11,5 24,5 27 - G 1 ⁄ 2 200 26 20 29 8,5 11,5 24,5 27 M 24 x 1,5 - 200 29 20 32,5 8 12 25 30 M 26 x 1,5 G 3 ⁄ 4 200 32 20 34 8 12 25 32 M 30 x 1,5 - 200 36 20 39 8 12 25 36 - G 1 200 39 20 44 8 12 25 41 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 color ring marks an 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 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. Information • Valve body Brass MS • Breather cap Stainless steel AISI 304 M • Sealing disk Brass with silicone-rubber coating (VMQ) • Pressure spring Stainless steel AISI 301 • Seal DIN 7603 A Soft iron 1.0338 • Temperature resistant from -30 °C to +200 °C • Stainless Steel Characteristics → Page 2166 • RoHS Specification 3 4