JIS Cast Iron Air Vent Head (DN100~DN450):
China JIS Cast Iron Air Vent Head (DN100~DN450):
Air Pipe Head is also called as Air Vent Head or Tank Ventilation Check Valve. It is the ventilation valve of the water tank or oil tank.It makes sure that the tank pressure is not over the design pressure by air exhausting or air suction.If the tank pressure is high, it will exhaust. If the tank pressure is low, it will inhale.The air vent head also can prevent the water,rain,insect,mouse,spark..etc into the tank.
Technical Specification for Air Pipe Head:
Connection: Flange Type
Model No: JIS-KS91A-121
Flange Standard: JIS B2220 FF- 5K/10K/16K
Nominal Size: DN50~DN450
Certificate: CCS
*If for water tank, the protective cover is open type. If for oil tank, the protective cover is semi-closed type.
Material for Air Pipe Head:
| S/N | Name | Material |
| 1 | Hex Bolt | SUS304/Galv SS |
| 2 | Cover | SS400 c/w Galv |
| 3 | Cushion | Graphite |
| 4 | Body | Cast Iron FC200 / Nodular Iron FCD450 |
| 5 | Hex Bolt | SUS304/Galv SS |
| 6 | Rubber Ring | NBR |
| 7 | Screen | SUS304 |
| 8 | Screen Cover | SS400 c/w Galv |
| 9 | Float Disc | SUS304 |
| 10 | Hex Bolt | SUS304/Galv SS |
| 11 | Rubber Cushion | NBR |
| 12 | Cushion | SUS304 |
| 13 | Guide Bolt |
SUS304/Galv SS |
Main Data of Joining (mm):
| DN | D2 | D3 | HT | H1 | T | N-d1 | A | A3 | R |
| 100 | 165 | 200 | 220 | 160 | 16 | 8-19 | 245 | 155 | 250 |
| 125 | 200 | 235 | 250 | 180 | 16 | 8-19 | 270 | 180 | 288 |
| 150 | 230 | 265 | 285 | 208 | 18 | 8-19 | 316 | 216 | 330 |
| 200 | 280 | 320 | 365 | 269 | 20 | 8-23 | 394 | 274 | 432 |
| 250 | 345 | 385 | 430 | 314 | 22 | 12-23 | 485 | 325 | 546 |
| 300 | 390 | 430 | 530 | 367 | 22 | 12-23 | 550 | 384 | 616 |
| 350 | 435 | 480 | 570 | 415 | 24 | 12-23 | 661 | 425 | 714 |
| 400 | 495 | 540 | 640 | 475 | 24 | 12-23 | 703 | 457 | 749 |
| 450 | 555 | 605 | 713 | 522 | 24 | 12-23 | 816 | 510 | 830 |
*The flange size in the above list is JIS 5K.
