用途 User

该阀用于高层建筑消防系统中。当给水管路中压力超过泄压设定压力，泄压阀开启，防止管线及设备因超压而损坏；压力降至设定值时，该阀自动关闭。

The valve is used in high - rise building fire protection system. When the pressure in the feed line exceeds the pressure of pressure release, the relief valve is opened to prevent the pipeline and equipment from being damaged by overpressure. When pressure drops to a set value, the valve shuts off automatically.
   

特点 Characteristic

阀体采用全通道流线型设计，流体阻力小，流量大。该阀既可做泄压阀又可做持压阀，做泄压阀时可将给水管中超过导阀安全设定值之压力释放，并维持管中压力于安全值之下，以防止水压过高造成系统危险；做持压阀时可维持主阀上游供水压力于某一设定值以上，只有上游压力高于设定值时，才向下游供水，以保证主阀上游供水压力。

Valve body adopts full channel streamline design with small fluid resistance and large flow. Can do pressure relief valve and the valve can be used as a pressure valve, when doing relief valve in the feed pipe can be more than pilot valve value for pressure release, and maintain the pressure in pipe under the TVC, in order to prevent the excessively high hydraulic pressure system risk; When holding the pressure valve, the upstream water supply pressure of the main valve can be maintained above a certain set value, only upstream pressure is higher than the set value, to supply water downstream to ensure the upstream water supply pressure of the main valve.

原理 Principle

主阀的进口侧通过控制管与导阀相连，当进口侧压力大于导阀设定压力时，导阀打开、泄掉膜片上腔的压力，主阀瓣随之打开。主阀泄压，压力降低至设定压力时，导阀关闭，主阀也关闭。

The inlet side of the main valve is connected to the guide valve through the control tube. When the inlet side pressure is greater than the guide valve setting pressure,the guide valve opens and release the pressure of the cavity on the diaphragm, and the main disc opens. Main valve release pressure, pressure drop to set pressure,guide valve close, main valve also close.

执行标准 Executive standard

法兰尺寸 Flange dimensions：GB/T 17241.6

试验检验 Test test：GB/T 13927

安装图典型 Installation diagram