ZSH Shanghai Valve Manufzcturing Co.,LTD.

nstalled in the pipeline, high-rise building fire water supply system and water supply system, water supply pipeline when the pressure exceeds the pressure relief valve set pressure relief valve automatically open quick pressure relief protection, pipeline safety, also can be used for holding pressure valve, the main valve upstream water supply pressure protection. Can accurately maintain the constant pressure to set the safety, once the overpressure, pressure relief valve quickly open, timely pressure relief. Close the stable and reliable, eliminating the pressure wave.
Note: parameters are for reference only, or are not full. Valve can be used in accordance with the requirements of different pressure, material, diameter, drive, etc.. Specific please contact or online advisory contact.

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公称通径：DN50~DN1200
公称压力：1.0~4.0Mpa
适用介质：水、油品
适用温度：0~80℃
连接形式：法兰
材质：铸铁，铸钢，球磨铸铁，不锈钢

DN	50	65	80	100	125	150	200	250	300	350	400	450	500	600	700	800	900	1000
L	205	216	250	320	365	415	500	605	698	787	914	978	978	1150	1300	1450	1650	1800
H	300	337	467	520	580	640	778	889	1010	1037	1264	1294	1324	1600	1750	1900	2100	2400

当管道从进水端给水时，水流经过针阀进入主阀控制室，出口压力通过导管作用到导阀上，当出口压力高于导阀设定值时，导阀关闭，控制室停止排水，此时主阀控制室压力升高并关闭主阀，停止供水。当出口压力降到导阀设定压力时，控制室向下游排水，由于导阀的排水量大于针阀的进水量，主阀控制室压力下降，进口压力使主阀开启，稳定状态时，控制室进水，排水相同，开度不变，出口压力不要，调节导阀弹簧即可设置出口压力。