principle：

the inlet side of the main valve is connected to the pilot valve via a control pipe.when the pressure on the said is over the one set with the pilot valve.the pilot valve is opened to release the pressure in the upper cavity of the diaghragm and the main valve disc is opened accordingly,when the pressure of the main valve is released to the set one,the pilot valve is closed,so does the main valve.

purpose:

this valve is used for the high building fore-fighting system.when the pressure in the water supply pipeline is over the set one for the pressure releasing valve,the said valve is opened to prevent the pipeline and equipment against damage due to an excessive pressure;then,when the pressure lower to the set valve,automatically closeed.

characteristic:

The body uses full streamline design,of a small fluid resistance and a heavy flow .this valve can be used as either a pressure releasing or holding valve.when used as the former,it can release the pressure surpassing the safe valve set with the pilot valve and keep the pressure inside of the pipeline below the safe valve to prevent system against danger due to an excessively high water supply pressure of the main valve over some set valve ,this is because water supply to the downstream can not be done,unless the upstream is higher than the set valve,in order to make sure of the upstream water supply pressure og the main valve.

How to reach our factory：
by plane:
From Beijing airport:240kms,3 hours by driving.
From Tianjin airport:150kms, 2 hours by driving.
By Train:
From beijing South railway station:224Kms, 1 hours
From Shanghai Hongqiao railway station:1167Kms, 4.5 hours
By Car:
From CangzhouXi railway station:45kms, 40 minutes.

Our address：Botou Industry Park,Cangzhou City,Hebei Province ,China
contact person to pick you up from air port or anyplace in China，please call alan：+8615831888892
you can add my whatsapp:+8615831888892
you can add my wechat:885893
you can call me:0086-15831888892

Botou Shengfeng auto-valve Co,. LTD is a specialized manufacture enterprise that focuses producing, installing, sale and service. The main products include Gate Valve,Waterpower Control Valve,Center Line Butterfly Valve, Flanged Butterfly Valve, Metal Butterfly Valve, Check Valve, Microresistance Slow Close Check Valve, Multi-function Pump Control Valve and their series products. Moreover, we can produce control valve and pressure reducing valve that are different materials, pressures, specifications, actuation ways. Our products include more than 50 serials and 1200 species, and the annual production output is more than 8.000 metric tons. Shengfeng valves have been selling well all over China and exporting to Europe, America and other countries and areas, which are used widely in water supply and drainage, electric power, petrol chemical industry, metallurgy and other trades. Our products are quite creative, good quality, cheap price and excellent .