500X 持壓泄壓閥廣泛用于給排水、消防、電廠等行業的水管道中，可對壓力波動快速反應和快速泄放，防止壓力急劇增高而損壞管道及設備，500X 持壓泄壓閥主要用于消防或其他供水系統中，以防止系統超壓或維持消防供水系統的壓力。消防泵關閉后還可以減小水錘的沖擊。也用于大型供水系統的水錘消除裝置。并且閥門控制系統的進口處裝有一個自清潔濾網，利用流體特性，使比重較大、直徑較大的懸浮顆粒不會進入控制系統，確保系統循環暢通無阻，使持壓泄壓閥能安全可靠地運行。系統動作平穩、強度高、使用壽命長。

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.