疏水阀直通与球型结构比较.pptVIP

1) Conval Globe Valve vs. Mogas VTI Ball Valve 1)?? Conval直通阀与Mogas VTI球阀的比较 ? Mogas and VTI manufacturer a ? turn quick opening ball valve. Conval manufacturers a multi-turn slow opening globe valve: The function of these products is completely different. Ball vales are typically used where full flow quick opening is very important. Globe valves are typically used where lower CV’s are not a problem and high pressure is in the line. Mogas和VTI生产90度转角的快开球阀。Conval生产多回转的直通阀，开启速度较慢。这两种产品的功能是完全不同的。球阀通常用于完全流通及快开要求非常严格的场合；直通阀通常用于管线压力高而流通能力不高的场合。 Ball valves in high-pressure applications cause major problems because of the energy (water hammer) that goes down line when the valve is opened. It often causes problems with sparger systems in condensers or other very expensive equipment. This quick opening is never a problem with gate or globe valves. The exception to this is when you have two valves in one pipeline and the ball valve is the root valve. If the operators leave the second valve (globe) closed and open the root valve (ball) and only after opening the ball valve open the globe and reverse this process when closing, then the root valve as a ball valve would be a good high pressure ball valve application. The only other good high-pressure ball valve applications would be isolation valves where there is no differential pressure. 球阀在高压的应用场合往往会引起很大问题的原因是由于当阀门开启时巨大的能量（水锤）直接通往下游。它通常会损坏冷凝器中的喷淋系统或其它昂贵的设备。而如果使用闸阀或直通阀就没有这个问题。如果在管道中采用两个阀门（球阀下游，直通阀在上游），用得也会不错。开启球阀时将上游的直通阀保持关闭，待球阀全开后再开启直通阀，关阀时先关直通阀再关球阀，直通阀对球阀起到一定的保护，这样的话此球阀在高压的应用场合也是不错的。高压球阀可用的另一个场合是用作前后无压差的隔离阀。 Many high-pressure ball valve manufacturers say that they can contour the ball or put a slow opening gearbox on top of the valve. This is correct but it will substantially shorten the life of the ball valve. Any throttling with a ball valve will quickly blow a hole in the valve or in the pipeline. 许多高压球阀生产商声称可以通过控制球的轮廓或在阀上放置一个缓慢开启阀门的齿轮箱来解决由快开造成的问题，但是这会明显地缩短球阀的寿命。任何用球阀来调节的地方，很快就会在阀体或管道中会吹出一个孔来。 Both Mogas and