2016年7月25日星期一

How to choose the full bore ball valve and reduced bore ball valve

National standards, the United States and European standards are not raised full bore and reduced bore ball valve problem that requires all ball valves are to be pressure drop test, only the standard set forth in Korea: ball valve port inner diameter equal to the inner diameter of less than 85% called reduced diameter valve, ball valve port diameter greater than the inner diameter of 95% referred to the full bore ball valve.
Considering the price, the international community generally defaults, using the same ball diameter adjacent the inner diameter. As DN32 and DN40, DN50 and DN63, DN90 and DN110, DN160 and DN200, DN250 and DN315 using the same sphere. Korean standard has an inner diameter of the ball clearly stipulates: 20A, 25A, 30A, 40A (equivalent to DN25 to DN50), 100A and 125A (equivalent DN110 and DN140), 200A and 250A (equivalent DN200 and DN250) or 250A and 300A (equivalent DN250 and DN315) using the same sphere. Canada JANA laboratory test shows that when the inner diameter of the ball valve port is greater than the inner diameter of the tube for more than 80%, almost no effect on the ability of the fluid through the pipe.
So what occasions to choose the full bore ball valve and reduced bore ball valve? For conveying sticky, easy to knot ball slag medium pipe should use full bore ball valve, convenient regularly purged through scraping wax. For transporting gas or similar physical properties should be used on medium piped water reduced diameter valve, full bore because of the weight ratio of about 30% lighter ball will help reduce pipeline load, reducing costs, but require regular pigging The pipeline, no matter what kind of media delivery, must use full bore ball valve. According API6D standard, ball valves and two reduced diameter ball valve full bore, reduced diameter valves in DN300 and shrink within a specification, DN250-600 shrink two specifications, DN600 above the contract negotiations.
Should you want to know more about ball valve from Reliable China valve manufacturer, please visit www.reliavalve.com or email us via sales@reliavalve.com.
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