泄压持压阀可将给水管中超过引导阀安全设定值之压力释放，并维持管中压力于一安全设定值以下，以防止管中高压或突压（SURGE）毁损管线或设备。可用于高层大楼消防测试循环系统之泄压用，以防止水压过高造成系统危险。持压阀：可维持主阀上游供水压力于某一设定值以上，以保障主阀上游供水区之压力。
Pressure Relief/sustaining pilot featureseasy operation and accurate pressure control
Diaphragm assembly for long term lifeservice and reliable performance.
Size Range : DN50-700MM
Ratings : PN10, PN16,PN 25
Body : Ductile Iron, GJS 500-7
Coating : Powder epoxy coating
End Connection : PN10 / PN16 / PN25
Function:
1. Relief: whenever the system pressureexceeds the preset of pilot, the valve will immediately open to release excess pressure. And keep thesystem in a safety environment.
2. Sustaining: prevents upstream pressure(mainline) from dropping below the preset pressure.
