Small size air vent valve is screw type, normally is will be install with a thread ball valve . We also have Double Air Release Valve of Flange type. There is a large and a small orifices. The large one can intake and release large amount of air. The air way of the large orifice is sym-metrical which makes the air releasing amount more than that of the same size double orifices air releasing valve
1- Body/Bonnet: GGG25/50
2- Ball: SS304 or ABS
3- Bolts/Nuts: SS304
4- Pressure Rate: PN10/16
5- Epoxy Resin coating internal & external, thickness above 300 micron
6- Size: DN15-50
7- Connection: Screwed to BSP or NPTÂ 
Suzhou Walter-fsv Company always keep eyes on products quality. WALTER-FSV Supply OEM Service for air vent valves. And also include all kinds of valve.Â
Thread Cast Iron Air Vent Valve
Model NO.: ARVX
Model: Single Orifice
Connection: Threaded
Screwed: NPT or Bsp
Coating: Epoxy Resin Coated
Trademark: WALTER
Origin: Suzhou, Jiangsu
HS Code: 84818040
Threaded Air Vent Valve