In order to explore a type of pressure relief valve type with an even more suitability to a large irrigation pipe network, a new type design of pressure relief valve was proposed, and its structure and working principle were explained. Using Gambit and CFX software, three-dimensional models of the valve were established at five openings(i.e. 0.8, 1, 1.2, 1.6 and 2.4 cm)of the valve clack and numerical simulations were conducted to analyze static characteristics of the valve body. The variation rules of inlet and outlet pressure difference and the driving force on the valve clack were demonstrated under various inlet flow conditions, Meanwhile, the pressure and velocity contours in the valve body and a few specially chosen cross-sections were also analyzed. The pressure differences between inlet and outlet under different inlet flow conditions were measured on an experimental model when the clack openings were at 1, 1.6 and 2.4 cm, respectively. The results show that the deviation between measurement and simulation is between 2.8% and 7.9%, suggesting the proposed design is reasonable. This outcome provides a theoretical guidance for hydraulic design of the valve body, and offers reference for similar product development in the future.
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