Valve is closed (valve) driven by the stem and do along the central axis of the valve seat down movement of the valve, the piping used to connect or disconnect the main line of the media, but can not do with the throttle. 
 Lining the basic structure of cut-off valve 



 1, plastic-lined straight-through valve type J41, J45-type straight slide-type valve, J44-type angle-type valve, with a compact, flexible, open and close, strong corrosion resistance, short stroke (typically nominal by 1 / 4 ) and so on. Is widely used in petroleum, chemical and other piping systems do cut the media to use, but the plastic-lined valve used as flow control is prohibited, to avoid cutting the mouth of the high-speed media streaming erosion damage to the sealing surface. 

 2, the valve stem design as a whole structure and to prevent the pipeline pressure fluctuations within the body parts out the possibility of compact, safe to use. 

 Lining valve design specifications 

 Follow GB / T 12233, GB/T12235, ANSI B 16.34 standard 

 Lining valve drive 

 Manual, worm gear rotation, pneumatic (normally open or normally closed), electric