Double-port exhaust valve
I. Product Introduction:
The QB2 double-orifice air valve, also known as the P2 air valve, is an essential component for pipelines. It is installed at high points or air trapping locations in pipelines to eliminate gas inside the pipes, unclog the pipelines, and ensure normal operation. In cases of power outages or pump shutdowns, negative pressure may form in the pipes, leading to pipeline vibration or rupture. This air valve inhales air in a timely manner to ensure pipeline safety. When gas inside the pipeline needs to be discharged, rotate the valve stem counterclockwise to lift the valve stem and the valve body, allowing air in the pipeline to enter the valve chamber under the pressure of water and be discharged through the exhaust port. As water fills the valve chamber, the float moves upward under the buoyancy of water, blocking the exhaust port and achieving self-sealing. During normal pipeline operation, air in the water continuously enters the upper part of the valve chamber under pressure, forcing the float to drop and leave its original sealed position. At this point, air is discharged from the exhaust port, and the float returns to its original position for self-sealing. Therefore, during normal operation, the air valve remains open, and the float repeats the above actions to continuously discharge air. When maintenance or cleaning of the valve chamber is required, the valve should be closed. Rotating the valve stem clockwise closes the air valve.
II. Product Features:
1. It can eliminate gas in pipelines, reducing resistance and saving energy.
2. It can automatically inhale air quickly under negative pipeline pressure, preventing pipeline rupture.
3. The float is made of stainless steel, ensuring a long service life, safety, and reliability.
III. Performance Specifications:
This valve is suitable for water and hot water pipelines with a temperature not exceeding 100°C, enabling complete gas discharge from the pipelines.
⑴ Note: For pipelines with a diameter D＞350mm, please select a single-orifice air valve (QB1-10).
⑵ When installing a double-orifice air valve, a protective valve (ball valve Q41F-16) must be installed underneath to avoid water shutdown during inspection.
⑶ If the client requires changes to the flange size of this air valve, please specify the flange connection dimensions in the contract.
This air valve is suitable for pipelines transporting water, hot water, and high-temperature water up to 100°C, ensuring complete gas discharge from the pipelines.
IV. Technical Parameters:
Product Model: P2, QB2
Nominal Diameter Range: DN40 ~ DN300
Pressure Range: PN10
Temperature Range: －5℃~ 80 ℃
Valve Body Material: Cast iron, cast steel, stainless steel
Connection Method: Flange
V. External Connection Dimensions:
Model | Nominal Diameter | Main Dimensions (mm) | ||||||
D | D1 | D2 | L | Z-φd | Medium | Valve Body Material | ||
QB2-10 | 40 | 145 | 110 | 85 | 430 | 4-φ18 | Water | Cast iron |
QB2-10 | 50 | 160 | 125 | 100 | 430 | 4-φ18 | Water | Cast iron |
QB2-10 | 75 | 195 | 160 | 135 | 470 | 4-φ18 | Water | Cast iron |
QB2-10 | 100 | 215 | 180 | 155 | 500 | 4-φ18 | Water | Cast iron |
QB2-10 | 150 | 280 | 240 | 210 | 540 | 8-φ20 | Water | Cast iron |
QB2-10 | 200 | 335 | 295 | 265 | 700 | 8-φ20 | Water | Cast iron |
| Machinery & Equipment/Valves/Air Vent Valves | |
