Cast Iron Air Vent Valve

Pressure: PN 16

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