500X 持压泄压阀广泛用于给排水、消防、电厂等行业的水管道中，可对压力波动快速反应和快速泄放，防止压力急剧增高而损坏管道及设备，500X 持压泄压阀主要用于消防或其他供水系统中，以防止系统超压或维持消防供水系统的压力。消防泵关闭后还可以减小水锤的冲击。也用于大型供水系统的水锤消除装置。并且阀门控制系统的进口处装有一个自清洁滤网，利用流体特性，使比重较大、直径较大的悬浮颗粒不会进入控制系统，确保系统循环畅通无阻，使持压泄压阀能安全可靠地运行。系统动作平稳、强度高、使用寿命长。

500Xpressure holding or relief valve is widely used in water pipeline of water supply and drainage, fire protection, power plants industry, it has the rapid response and release for pressure fluctuation, so as to prevent the damage to pipeline and equipment for the sharply increase of pressure. 500Xpressure holding or relief valve is mainly used for fire or other water supply systems, preventing the system overpressure or maintaining the pressure of fire fighting water supply system.The impact of water hammer can be reduced after fire pump is closed. It is also used in water hammer eliminating device of large water supply system. And there is a self-cleaning strainer at the inlet of valve control system, the properties of fluid make the suspended particles with larger proportion and diameter cannotenter the control system, thus ensuring the system circulation unobstructed, also making the pressure holding or relief valve run safely and reliably. The system action is smooth, it also has the advantages of high strength and long service life.