Whether the valve needs to install the principle and setting of the bypass valve
Whether the valve needs to install the principle and setting of the bypass valve
We occasionally see some relatively large valves in some pipelines, and bypass valves are always installed. Why is this? What is its main function? Under what circumstances does it need to be installed? And what is the size of the bypass valve of the corresponding equipment?
In fact, a bypass valve is set in the pipeline, and its role can generally be divided into two major points: one is to play a protective role (balance the pressure at both ends), and the other is emergency backup!
1. The protection function can also be said to be a protective measure for the main valve to prevent the opening resistance from being too large due to the excessive pressure difference between the front and rear of the valve, and the valve is not easy to open, especially in some large-diameter or high-pressure valves. pipeline. Before the high-pressure pipeline is opened, the pressure is relieved through the bypass valve to avoid the sudden influx of high pressure and the impact on the pipeline below the valve. Or the pressure difference between the two ends of the valve is too large, and the opening torque is too large. In order to avoid torque damage to the valve, the valve is opened after bypassing and decompressing.
2. The emergency function, used as a spare pipeline, the biggest advantage is that when the main valve fails, or when maintenance is required, the bypass valve can be opened for circulation without affecting normal production.
Whether the valve needs to be installed with bypass valve specific requirements and settings: (for reference only)
2.5MPa class, above DN400; 4.0MPa class, above DN250; 6.4MPa class, above DN200; 10MPa class, above DN150;
For DN100~DN200 valves, the bypass pipe and bypass valve are DN20; for DN250~DN600 valves, the bypass pipe and bypass valve are DN25; for valves above DN600, the bypass pipe and bypass valve are DN40.
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