Is it a reasonable design to connect a check valve followed by a ball valve in the outlet pipeline of a centrifugal pump? Why?
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I saw a drawing; the design calls for it to be done this way. In the past, a ball valve was used first, followed by a check valve!
Reply to 1# buerkuaile: The correct order is to install the check valve first and then the ball valve; you were wrong before
Here, it’s always a check valve first, followed by a ball valve (or globe valve); we’ve never seen a ball valve used first and then a check valve
It is recommended that the original poster check the link below; Hai Chuan once had a dedicated discussion on this topic. http://bbs.hcbbs.com/viewthread.php?tid=705269&extra=&page=1
It should be the check valve first, followed by the shut-off valve; the main consideration is that in case there is a problem with the check valve, it can be repaired or replaced by shutting off the flow； Conversely, it is not possible to carry out maintenance or replacement.
I’ve also seen the link posted on the 4th floor; Haiyou has been discussing this issue for a long time. Personally, I also support the view of installing the check valve first and then the shut-off valve
The proper arrangement is to have the check valve first, followed by the shut-off valve (ball valve or globe valve). 1. Consider the need for maintenance of the check valve. 2. With this arrangement, the check valve will not be under pressure
All I’ve seen are check valves first, followed by other valves
It is mainly to consider the convenience of maintenance and replacement in actual use. The most fundamental thing is that the theoretical design must stand up to practical testing.