1 gate valves and butterfly valves in water supply network in order to reduce the pipeline turns the soil depth, generally larger diameter pipe matching butterfly valve, the impact is not big on the depth of overlying soil, equipped with gate valves, with high caliber line should be taken into account according to the specific situation around. From nearly a decade in terms of usage, the failure than of butterfly Industrial Valves gate valve is high, so in situations where conditions permit, enlarge the using range of gate valves is worthy of attention. ( 2) Gate valve in recent years, the domestic many valve manufacturers, the development, the generic soft-sealing gate valve, the valve than traditional wedge or parallel double sluice gate valve has the following characteristics: a. Soft-sealing gate valve body, valve cap by using precision casting foundry, a molding, basic mechanical processing, do not use seal copper ring, save non-ferrous metals. b。 Soft-sealing gate valve at the bottom of the pit does not accumulate slag content, valve opening and closing of low failure rate. c。 Soft seal rubber disc size is unified, strong interchangeability. So the soft-sealing gate valve is a form of water supply industry is willing to adopt. At present domestic manufacturing soft-sealing gate valve diameter of 1500 mm, diameter in 80 - but most of the manufacturers Between 300 mm and domestic manufacturing process has many problems, from the investigation of the case, the body of a Shanghai valve manufacturing company is entrusted domestic foundry cast in resin sand molding turn, soft seal valve plate imported from a foreign company. The company believes soft-sealing gate Industrial Valves are key components of the rubber lining valve plate, and the technical requirement of rubber lining valve plate is higher, not all foreign manufacturers can achieve, often buy assembly from the reliable quality of the manufacturer. Domestic copper nut soft-sealing gate valve block is embedded on the rubber lining at the top of the valve plate, similar to the structure of gate valve, due to the activities of the nut block friction makes the valve plate of rubber lining. A foreign company's soft-sealing gate valve, copper nut block is embedded in the rubber lining inside the gate, form the whole body, to overcome the above shortcomings, but combination bonnet and valve body, the concentricity of the demand is higher. Soft-sealing gate valve opening and closing, never should be close to death, as long as the stop-water effect can be reached, otherwise not easy open or rubber lining. Some valve manufacturing company in shandong, in the valve pressure test, inspection, use the torque wrench to control the degree of closure, as tap water company valve operation personnel should also be a copy of the opening and closing method. In this paper, the keyword search: valve supply more information
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