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Opening optimization scheme of pressure surge preliminary relief valve |
Yi Wanshuang, Jiang Jing, Li Dongdong, Lan Gang |
School of Power and Mechanical Engineering, Wuhan University, Wuhan, Hubei 430072, China |
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Abstract In order to confirm and study the deterioration of negative pressure in the system caused by pressure surge preliminary relief valve, the numerical simulation of pressure surge preliminary relief valve′s protecting effect is conducted based on the mathematical model of water hammer calculation and the method of characteristic lines. In the meantime, an optimization scheme is brought up for the delay of the initial time when the valve is open. Through the water hammer calculation and by comparing the negative pressure before and after the optimization, it indicates that the installation of pressure surge preliminary relief valve does increase the negative pressure of the system, which will have adverse impact to the piping system. On the other hand, the scheme of delay in opening the valve can effectively eliminate or obviously weaken the deterioration of negative pressure effect caused by installing pressure surge preliminary relief valve. The research has significant guide and important reference value in protecting water supply system from pump-station water hammer with pressure surge preliminary relief valve.
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Received: 01 November 2013
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