Brand DDSG Model SVN DN15-200 PN16-25 
 Scope of petroleum, chemical, mining, pharmaceutical, metallurgy, electric power, nonferrous metal, textile, food industry and building heating, gas systems. Stainless steel body material 
 Product Alias ??piston valve nominal diameter DN15-DN200 (mm) 
 For medium hot oil, salt, acid and alkali liquid, gas, water pressure range (Mpa) 
 Suitable temperature +480 \ -180 (℃) 

 The dawn of the piston valve SG 

 The new design, unique sealing mechanism 

 The dawn of the piston valve is "no seat, soft seal" structure, is a zero leakage outside the ideal cut-off valve. Driven by hand wheel to move the piston in the upper and lower valve stem loop to achieve inter-movement between the atmosphere and the entrance sealed. When the piston is in position, the valve ring was on hold, to ensure that the media does not leak (for air sealing), then the valve is open. When the piston is low, is also under the valve ring to hold fast to ensure medium without endoleak (entrance valve seal), the valve ring is closed at this time. 

 When the piston valve between the gland and the butterfly spring stud pad to always keep the upper and lower valve ring is pressed state, and can compensate for pressure fluctuations, temperature changes, pneumatic tightening the valve seal. 

 Zero external leakage, an ideal replacement 

 Piston valve was invented in Europe in 1922, after decades of improved, and now tens of millions of valves have been used around the world. Because of its new design and a unique sealing mechanism, completely solve the chronic problem of internal leakage of the valve. Both can be self-cleaning, easy operation, long life, simple maintenance, do not split line valve replacement and fire, safety and reliability expertise. 
 Key rings: piston valve seal ring is the key part. It is made of high strength, high temperature, corrosion, wear resistance, non-toxic, undergo long-term high temperature stability without the loss of elasticity and can size of the composite material manufacturing. Consisting mainly of PTFE, graphite and carbon fiber. Sealing ring is high-tech products, and withstood the test millions of reciprocating motion, can provide a good sealing performance. 

 We usually supply various specifications of the sealing ring can be at a temperature of -100 ℃ - 400 ℃ under the conditions of continuous use without failure. 
 Excellent sealing performance: the closure of the valve piston combination is a stainless steel piston, the upper and lower flexible seal ring and the two maintain a fixed distance down the metal frame. The same as the stopper piston sealing ring inserted in two. Body and the sealing ring, piston and seal ring sealing strength of the connection between the body and bonnet bolts and nuts provided, so that they work closely with each other to form a cork effect. Sealed area much larger than the ordinary cut-off valve, sealing the valve is much better than ordinary. You can rest assured that use.