Cast Iron Air Vent Valve
Size: 1 to 8 inches (25 to 200 mm)
Brand: SAM
Manufactured by: SAM-MAHAB
Application: Water
Material Group | Material Number | Code Number | Material Standard |
Gray Cast Iron | 0.6025 | GG25 | DIN 1691 or ISO 185 |
Brass | CuZn 39 Pb3 | — | — |
Polyethylene | — | — | DIN 16779 |
Rubber | — | NBR | DIN 53538 or ISO 4658 |
Application:
- Venting during emptying the pipe:
o A differential pressure is produced between the lower pressure inside the pipe and the higher outside pressure (atmospheric pressure). To avoid pipe indentations venting is necessary.
- Air release when filling the pipe:
o During filling the pipe, air is being released through the large bore. The closing device and the float in this case are not being pressed into the seat. Initial air velocity between 150 – 200 ( is recommendable. However, maximum velocity up to sound velocity (333 is possible without any problems.
o During final phase of filling procedure, the water level rises inside the air valve. Consequently, float is moving by buoyancy to close position. Proper use of an air valve permits risk-free performance of all operations on a water pipe including:
- Filling the pipe
- Emptying the pipe
- Removing gas or bubbles from the pipe
DN | D | K | A | b | H | d | Bolts | Weight (Kg) | B | C | ||
in | mm | |||||||||||
Single
Chamber Air Valve (Small Bore) |
1 | 25 | 115 | 85 | 68 | 16 | 200 | 14 | 4 x M12 | 15 | – | – |
2 | 50 | 165 | 125 | 102 | 20 | 225 | 18 | 4 x M16 | 21 | – | – | |
3 | 80 | 200 | 160 | 138 | 22 | 255 | 18 | 8 x M16 | 25 | – | – | |
4 | 100 | 220 | 180 | 158 | 24 | 290 | 18 | 8 x M16 | 37 | – | – | |
Single
Chamber Air Valve (Large Bore) |
2 | 50 | 165 | 125 | 102 | 20 | 245 | 18 | 4 x M16 | 17 | – | – |
3 | 80 | 200 | 160 | 138 | 22 | 275 | 18 | 8 x M16 | 26 | – | – | |
4 | 100 | 220 | 180 | 158 | 24 | 325 | 18 | 8 x M16 | 32 | – | – | |
6 | 150 | 285 | 240 | 212 | 26 | 420 | 22 | 8 x M20 | 44 | – | – | |
8 | 200 | 340 | 295 | 268 | 30 | 517 | 22 | 12 x M20 | 56 | – | – | |
Double Chamber Air Valve |
2 | 50 | 165 | 125 | 102 | 20 | 250 | 18 | 4 x M16 | 24 | 324 | 172 |
3 | 80 | 200 | 160 | 138 | 22 | 280 | 18 | 8 x M16 | 43 | 415 | 202 | |
4 | 100 | 220 | 180 | 158 | 24 | 355 | 18 | 8 x M16 | 51 | 470 | 232 | |
6 | 150 | 285 | 240 | 212 | 26 | 440 | 22 | 8 x M20 | 122 | 540 | 290 | |
8 | 200 | 340 | 295 | 268 | 30 | 545 | 22 | 12 x M20 | 185 | 625 | 355 |
Flange mating dimensions: DIN 3202
Hydrostatic pressure test: DIN 3230 or ISO 5208
Working pressure: PN 16
Body pressure test: 25 bar
Sealing pressure test: 16 bar