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 A ball valve and plug is the same type of valve, only pieces of it off is a sphere, the sphere around the center line of a rotary valve to achieve open and close a valve. 
 Valve in the pipeline is mainly used to make cut, distribution and change the direction of media flow. Ball is widely used in recent years a new type of valve. 
 The main performance specifications Capability Criterion 
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 Related recommendation: 
 Gas valve http://www.wanhaovalve.com/ 
 Pneumatic valve http://www.kaitev.com/ 
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 Hydraulic Control Valve http://www.yitai-valve.com/ 
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 Endoscopic http://www.wzlongze.com/shijing.asp