QB1 Single port automatic exhaust valve product overview: QB1 single-port automatic exhaust valve is mainly composed of valve body, valve, upper cover, valve stem, float ball, exhaust nozzle, etc. Used for small diameter pipeline (pipe φ50-200), it as the exhaust function of the pipeline, so that the pipeline will not appear closed, air resistance, such as the pump will appear negative pressure in the pipe at any time when the power failure, automatic suction can protect the safety of the pipeline. It is suitable for water and hot water pipes whose temperature does not exceed 100ºC so that all the air in the pipeline is discharged. Install double-port exhaust valve, and be sure to install a protection valve and ball valve (Q41F-16) at the bottom to avoid inspection water outage. When it is necessary to discharge the gas in the pipeline, the air in the pipeline enters the body cavity under the pressure of water, and is discharged from the exhaust nozzle, and then the water in the pipeline is filled with water in the body cavity, so that the floating ball under the buoyancy of water moves upward to block the exhaust nozzle, to achieve self-sealing, the pipeline is in normal line, the air in the water under the action of pressure, constantly discharged into the upper body cavity of the exhaust valve, Force the float down, leaving the original sealing position, then the air is discharged from the exhaust nozzle, then the float and return to the original position self-sealing, therefore, the exhaust valve in normal work the valve is always open, the float constantly repeat the above action, the air is constantly discharged. When it is necessary to overhaul or clean the body cavity, the valve should be closed. Major parts
1
2
3
4
5
6
7
8
Valve body
Hollow balls
Gasket
Valve cover
Exhaust nozzle
Washers
Nuts
Double-ended studs
Main form connection size
Model number
Nominal diameter Dg
Main and connection dimensions
Body material
D
D1
D2
H
Medium
QB1-10 Flange type
15
195
160
85
330
water
Cast iron, cast steel
20
195
160
85
330
water
Cast iron, cast steel
25
195
160
85
330
water
Cast iron, cast steel
QB1-10 wire mouth type
1/2"
280
water
Cast iron, cast steel
3/4"
280
water
Cast iron, cast steel
1"
280
water
Cast iron, cast steel
1 1/4"
280
water
Cast iron, cast steel
1 1/2"
280
water
Cast iron, cast steel
Installation location: 1. Pump outlet, on the cross pipe before the check valve, exhaust when the pump starts, and exhale when it stops. 2. On the horizontal pipe at the downhill of the pipeline. 3, when the pump stops, it may cause vacuum or negative pressure. 4, long distance pipeline, every 1-1.5 kilometers at the cross pipe. 5, the height of the transverse pipe, the top of the riser. 1, the exhaust valve should be vertically installed on the horizontal pipe. 2. In order to facilitate maintenance, an isolation valve should be installed below the exhaust valve. 3. The exhaust valve shall not be installed in a strong acid or alkali environment. 4, the air exhaust valve should take anti-freezing measures, generally need to build kiln Wells to protect and anti-freezing.
