Driller valve manufacturer: What should be paid attention to when selecting the exhaust valve?

Driller valve manufacturer: What should be paid attention to when selecting the exhaust valve?

1. The choice of exhaust valve position is more important than the choice of diameter.

2. For long pipe threads, the ideal method of venting is to install a large number of smaller diameter exhaust valves over a short distance (generally 500 to 1000 m), rather than installing larger diameter but fewer and longer spaced exhaust valves.

3. In most cases, it is necessary to install valves of three function groups, namely, the small-capacity automatic exhaust valve, the large-capacity system water discharge valve, and the system vacuum extraction and vacuum destruction valve, namely, the composite exhaust valve.

4. When the slope of the two sides of the pipeline is different, determine the size of the exhaust valve according to the severity of the slope.

5. If the exhaust valve does not close slowly, it is better to install a large exhaust valve and a small exhaust valve in one place. If you choose a slowly closing exhaust valve, only one exhaust valve can be installed at the top of the pipe. Exhaust valves should be installed at each high point for large undulating pipes.

Driller valve manufacturer: Select the right exhaust valve need to consider the factors

1. The displacement is small, and it often takes a long time to restore the original water supply capacity after water is cut off; Polyu restored normal water supply capacity in a very short time.

2. The air closing pressure indicates the upper limit of the exhaust capacity of the exhaust valve. The exhaust capacity of the exhaust valve is not only related to the diameter of the valve, but also related to the gas pressure difference inside and outside the valve.

Driller valve manufacturer, under normal circumstances, the opening and closing of the large valve is limited by the up and down displacement of the floating ball, and the displacement of the floating ball is controlled by the liquid level in the valve chamber. When a large amount of gas is discharged in a rapid concentration, the ball float or valve plate will close due to the impact thrust of the gas, which will affect the normal discharge. The airflow pressure at which this phenomenon occurs is called the air closing pressure of the valve.

When the ball floats the valve plate on the valve hole, the air flow is interrupted instantaneously, the valve plate falls again, the air flow is formed again, the valve plate is closed again, and the system oscillates to close. In order to avoid the adverse effects caused by the air closing pressure, appropriate valve size should be selected when configuring the exhaust valve to ensure that the exhaust pressure corresponding to the maximum exhaust volume at the valve installation position should be lower than the air closing pressure. The above is the most important point to choose the right exhaust valve.

Because if the air closing pressure is too low, the air tends not to escape along the exhaust valve, the float ball inside the exhaust valve has been lifted by the air, closing the vent. The closing pressure of a good exhaust valve can reach 0.017MPa, which is sufficient to quickly discharge the air in the pipe. Thus, THE MAXIMUM FLOW RATE (90 m/s) IS ACHIEVED WHEN THE AIR PRESSURE IN THE BODY IS GREATER THAN 0.015 MPA.

3. Part of the exhaust valve device is located at the highest point of the pipe. Because the water pressure in this pipeline is sometimes very low, only when the water pressure is higher than 0.015MPa, part of the exhaust valve can be completely closed, if it is lower than this pressure, water leakage will occur. Therefore, the greater the range of water shutdown pressure, the better. Generally, 0.012~ 1.0mpa is the most commonly used range.

4. When selecting exhaust valve parameters, be sure to provide pipe diameter, working pressure and flow to the driller valve manufacturer. From these parameters, the diameter of the exhaust valve and the aperture of the exhaust hole are determined to ensure that about 2% of the dissolved air in the clean water can be discharged during the continuous release process under normal conditions.