Jingning neoprene think infrastructure is the focus of China's economic construction,water supply and drainage engineering, especially in water treatment equipmentsewage disposal project scope, including pipeline, neoprene, has formed a strong water industry. For the neoprene industry provides a good opportunity for development.China has entered WTO, the global annual demand of about 3000000 tons ofneoprene. To make full use of the neoprene industry is labor-intensive, poor working conditions, low wages per capita, the developed countries to carry out the transfer ofChina consumption and other advantages, and actively to the world economic system.The present situation of several titles to and development of drainage neoprene.
The current situation
Today there are about 3000 the size of the neoprene, including 600 in Wenzhou, 200 more than in Zhengzhou, Shanghai 150, Liaoning 250, Jiangsu, Fujian more than 200,although mixed, but the product has reached more than 3000 types of model, nearly 30000 specifications. In many species, sealing performance, strength and conditioningrequest function, performance and circulation performance, especially the sealing performance, have made great strides, back ten years ago, urban water supply authorities saying the industry association said the famous "ten valve nine missing",although some exaggeration, but it is a fact.
The formation of many problems of neoprene industry is the reform and opening up, the market rapidly expanding, and the original state-owned enterprises haveGuantingbingzhuan neoprene, the original mechanical industrial level is not high, so the township and village enterprises (private enterprises), have mushroomed rapid development, starting point is low, technical force is very weak, poorly equipped, most products are simulation of consumption, coupled with the market disorder, especially inlow voltage neoprene with the drainage, a serious problem. In the past ten years, in aneoprene drive, there was progress, GUI long valve summary of some species evenreached the international advanced level, there are many companies to stop the two venture. But on the whole, the gap is still very great, have a lot of work to do. To this end, respectively 2010, 2020, technological progress has very important significance to carry out the plan.
The commonly used neoprene
In water supply and drainage project, generally used in low pressure neoprene,especially large-diameter low-pressure (LP neoprene neoprene refers to the nominal pressure PN is less than or equal to 1.6MPa neoprene), and neoprene (PN2.56.4MPa)less pressure. The gate valve, butterfly valve is the most fundamental and most widely used products.
The status quo and development of 2.1 valve
Valve using the oldest, has the world's countries are still used, especially DN300mm the following, in various types of neoprene still occupies a leading position. The valve plate is characterized by pressure before and after the valve plate to force the pressure in the outlet on the right side of the seat, seal better, and fully open, the valve plate does not stay in the flow path because, small pressure loss. Used to cut off the medium in pipeline.
Its defect is the operating torque, the valve body, valve operation is easy to make thedamage, particularly in large diameter valve. Dimensions and weight are also great,DN1000 valve diameter of about 3200mm high, need four operations, so the valveusually used in small caliber, that is the use of DN500.
Valve from fully open to the middle of opening, small flow resistance of neoprene, close to the fully closed, the flow resistance increased dramatically. A large range, small changes in flow resistance, close to the fully closed, the liquid changes greatly, must not be used in the valve to close, then it is difficult to stop the flow of fine-tuning. Neopreneif the opening is very small, the opening of the flow rate of fast, lower side gate will produce cavitation, and accompanied by intense vibration and noise, long time cutting operation, often can make the body and gate metal attack cavitation. If conditions in the middle gate opening, the valve plate because it is relying on both sides of the rail support, fully closed with the close, while the middle position, the valve plate and the large gap rail vibration. Hongfeng think so, even in a low incidence of cavitation region,a long time to make neoprene throttle valve operation, rail will also attack deformity,wear or damage, and because the seat is not fully exposed, and exposed part of thesurface pressure is high, often will have a bite corrosion or adhesion, therefore, should not be used for flow control. Also note that the valve in the small opening, fluid changes,if the neoprene emergency opening and closing, will form a sharp rise in pressure or negative pressure, especially when the valve off the generation of water hammer.
On the basis of the metal seal gate valve, in recent years the development of the rubbersoft sealing gate valve, its characteristic is:
(1) the body of the bottom cavity free, fluid through the cross section is linear, not easy to accumulate and foreign inclusions.
(2) the valve plate sealing surface is the pressure in the body to stop water, close the valve torque is small.
(3) does not affect the sealing performance because of the bending and stretching piping.
(4) of the valve plate rubber lining, corrosion resistance, no rust water.
(5) neoprene in the open water and change the data and O ring seal.
(6) the good interchangeability.
Because of superior performance, Hongfeng see the world (especially in Europe)demand is rapidly growing, soft sealing gate valve is the Olympic Day 30 years agowhen people create, in Europe the annual consumption of more than 50 Taiwan, the use of nearly 100%, is a hard seal gate valve for the generation of products, its manufacturing in Europe and Japan as the diameter of DN500, USA ordinary use DN400, while Italy consumption to the DN1200. But there are not enough, the soft sealing gate valve is to rely on to stop tightening sealing rubber valve seat, can notdistinguish is closed, to prevent the valve shut tight, don't exceed the valve torque as well (torque given in the specification).
Present situation and development of 2.2 butterfly valve
Jingning neoprene remember the thirty's of last century, the United States created the butterfly valve, seventy years of the last century
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