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Adjustable pressure reducing valve series pressure problem solution introduction

The problem of series pressure of the adjustable pressure reducing valve is not a common phenomenon, but it is also a possible fault problem. As a user, we still need to have a good understanding and the ability to analyze and solve the cause:
Why does the adjustable pressure reducing valve have a series pressure problem during use?
Due to the rupture of the pipe network at the pipe section after the pressure reducing valve, the valve at P1 is closed or repaired, and when the pump A stops, the water pressure at the pipe section after the valve is low or even empty. When the normal water supply is restored, when the valve at the pipe section of the pressure reducing valve is suddenly opened or the pump A is opened, the pressure at the pipe section of the pressure reducing valve is rapidly increased, and the front pipe section and the rear pipe section of the adjustable pressure reducing valve are compared in a short time. The pressure difference is large, the pressure reducing valve is too late to work, and the pressure in the upper chamber of the pressure reducing valve is very small. Under such a large pressure drive, the pressure reducing valve is forcibly opened, causing the pressure before and after the pressure reducing valve to be balanced and decompressed. The valve fails for a short time, that is, string pressure.
Now that it has appeared, how can it be solved? The following summarizes three types:
1. Based on the working principle of the pressure reducing valve, a pressure relief valve is installed after the pressure reducing valve. When the pressure after the pressure reducing valve is higher than P2, the pressure relief valve is opened to relieve the normal water supply pressure of the village.
2. Shorten the string pressure time by other methods to make it close to zero.
3. According to the working principle of the adjustable pressure reducing valve, appropriately increase the diameter of the pilot valve and the conduit, reduce the time for the upper and lower chambers to reach the pressure balance, and even the time difference that tends to zero.
Through practice verification, the second scheme described above is the most economical and practical, and can be quickly opened by the drain valve, so that the pressure in the upper chamber of the diaphragm is greater than the pressure in the lower chamber, prompting the adjustable pressure reducing valve to recover quickly. normal. The string compression time is basically zero.

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