The 500X pressure relief/pressure holding valve consists of the main valve, pressure relief/pressure holding pilot needle valve, ball valve, micro-filter and pressure gauge to form the hydraulic control nozzle system. Using hydraulic automatic operation, it can be used as a pressure relief valve and a pressure holding valve. When used as a pressure relief valve, the water supply pressure can be maintained under the set safety value; As a pressure holding valve, the upstream water pressure of the main valve can be maintained above the set value and the upstream water supply pressure of the main valve can be maintained. 500X pressure relief/pressure holding valve uses hydraulic self-control, does not require other devices and energy, easy maintenance, one valve multi-purpose. Widely used in high-rise buildings, living areas and other water supply network systems and urban water supply projects.

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