Power Station Gate Valve

KOSEN Pressure Seal Gate Valves is a valve realizing the closing and opening function by lifting the disc up&down as the closure member. The main advantages of API Stainless Steel Gate valve are smooth flowing passage, small flowing resistance and small operation torque, while the main disadvantages of this valve are: easy-damaged sealing face, long closing&opening time, large volume&weight. Gate valve is widely used on pipeline as it's suitable to be manufactured with big size. Gate valve is and generally for cutting off purpose but not intended to be used as a regulating valve because the sealing face would be corroded by the medium easily when valve is not in fully open or closed position.

The pressure seal valves are designed in accordance with API600 and ASME B16.34 for service of high temperature and high pressure and are widely used in fossil fuel power plant. Compared with bolted bonnet joint valves, it provides absolute reliable sealing of the bonnet joint, so that the pressure seal valves are more compact and rigid as well as maintenance cost-effective at high temperature and high pressure service.

This kind of gate valve is not only characterized as simple structure and reliable usage, but also able to create slight flexible deformation to compensate the deviation of the sealing face angle generated during processing, thus improving the process performance. In addition, at seat and gate disc seal surface are over-lay with iron-base alloy or Co-base alloy or carbide alloy for long duration. 

Technical Specification
Normal Size Range: 2"-24"
Normal Pressure Rating: PN100~PN420, CLASS600~2500  
Material: WCB,LCB,WC6, WC9, CF8,CF8M,CF3,CF3M
Temperature Range: -29~425Degree C

Standards compliance
Design and Manufacture:AMSI B16.34,API600 API6D,BS1414
Face to face(end to end):ANSI B16.10,API6D
Flanged cnnection:ANSI B16.5
Butt welded end:ANSI B16.25
Test and inspection:API598,API6D
A.Back up ring:Absors thrust applied by internal pressure
B.Thrust ring:Protects the soft metallic gasket from deformation
C.Gasket:Unique angular design provides superior sealing