Ball Valve 
Threaded Ball Valve Flange Type Ball Valve Welding Type Ball Valve Butterfly Valve Concentric Butterfly Valve Eccentric Butterfly Valve Knife Gate Valve General Knife Gate Valve Professional Knife Gate Valve Strainer Forged Steel Valve Gate Valve Globe Valve Check Valve Other Valves and Fitting Sight Glass Sanitary Valves and Fitting Expansion Joint Plug Valve Needle Valve Steam Trap 
1.Valve function of the water supply network:
Water supply pipe network will send the water distribution to millions of households, and therefore the distribution of the water supply network in every corner of the city's water supply network pipe length less to hundreds of kilometers, up to thousands of kilometers.
Water is irreplaceable and the necessity for people to live, decide the importance of the safe operation of the water supply network. However, due to various objective and subjective reasons, pipes tend to be some failures, pipe network must constantly upgrading, water users must change frequently localized phenomenon and therefore without water pipe is difficult to avoid. In order to narrow the scope without water in the pipe network to properly install the control valve but very necessary. Therefore, in a city water supply network, the number of valves thousands and irregularly distributed in the city streets below.
Valve is a kind of "the idea that Japan, for the moment," the control device, usually required to open the valve in place, reducing water losses pipe segment. If necessary, the valve should be closed quickly, cutting the flow and reliable.
c. Soft seal rubber lined valve plate size uniform and interchangeable. So soft sealing valve will be willing to adopt a form of the water supply industry. Currently domestic manufacturing soft sealing valve caliber of 1500mm, but most manufacturers made between 80-300mm in diameter, there are many problems in the domestic manufacturing process, from the investigation of the case is concerned,Shanghai's body in a valve manufacturing company was commissioned by the domestic foundry casting resin sand molding turned soft sealing valve plate is imported from a foreign company. The company believes that the key components of the soft sealing gate valve plate is rubber lined, rubber lined and high technical requirements of the valve plate, not all foreign manufacturers can achieve, often purchased from a reliable quality factory assembled.
Domestic soft sealing valve block is embedded copper nut hanging rubber lined valve plate side, similar to the gate structure, due to the activities of the friction nut block valve plate rubber lining is easy to peel. A foreign company soft sealing valve, brass nut blocks are embedded in the rubber lined gate, form a whole, to overcome these shortcomings, but the higher the valve cover and valve combination concentricity requirements.
When you open and close the soft sealing valve, do not close off dead, as long as you can achieve the sealing effect, otherwise difficult to peel open or rubber lining. Shandong, a valve manufacturing company, when the valve pressure test, using a torque wrench to control the degree of closed valves as water companies operating personnel should be more open and close imitation of this method.
Keywords:butterfly valve ,knife gate valve,ball valve,globe valve,slurry gate valve
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