Overview 
 Forged steel flange end valve has three overall valve cover design, the first one is the valve cover bolts through the convex surface connection, the use of stainless steel and flexible graphite spiral wound gasket, ring joint can be used according to demand, the second is welding-type valve cover, sealed by welding threaded, demand can also be welded directly to the rigid, and the third is self-sealing valve cover, through the threaded connection with the self-sealing valve cover. 
 Structural design and specifications 
 Blue end of forged steel valves manufactured by the overall API602, BS5352, ANSI / ASME B16.34, test and acceptance by API 598, identified in accordance with MSS SP-25. 
 The valve structure is compact, reliable and attractive appearance. Use of forged steel valve, sealing ring is polytetrafluoroethylene plastic, high pressure, sealing, hand moving and flexible comfort. Threaded, flanged, welded connection in the form of three. Spool, the valve seat sealing surface quenched at high temperature, high pressure easy to wear, abrasion, good sealing and long life. Valve cover design has two 90 ° sealing cone, cone with the ring of a combination of lines into a double seal to prevent fluid leakage; valve fully open, the second cone on the cone and wedge stem to stop the flow of filling media . The valve can be widely applied to high, medium and low pressure pipeline system as a manual switch valve.