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https://www.irrigationhoses.com/products/irrigation-pressure-reducing-valve/

The drip irrigation pressure relief valve is a hydraulic control pressure reducing valve. Its main function is to monitor the maximum value of the water pressure in the pipeline. Once the pipeline water pressure exceeds or approaches the maximum value that the design bears, the sprinkler pressure relief valve will automatically weaken the pipeline water pressure until the pressure reducing valve or normal value for piping design. Sprinkler system irrigation relief valve are mostly installed in places where the terrain is steep and the water pressure of the pipeline changes direction, etc., which can easily rise sharply. The common structure of pressure reducing valve for drip irrigation for irrigation system is membrane type and spring type.

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