Fixed connection methods for the inlet and outlet pipelines of centrifugal pumps
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It is common to see a stop valve, filter, and drain port connected to the inlet of a standard centrifugal pump. The outlet pipeline is equipped with a pressure gauge, a drain port, a check valve, and a globe valve. It seems a fixed pairing has been established. I would like to ask when to use outlet drainage and inlet drainage? Can check valves and globe valves be interchanged? Are there any with filters installed at the outlet? I saw at the site that there was something at the pump outlet that was many times larger than the pipe diameter, resembling that \"larger section in the middle used for observation during fluid transfer.\" What is that?
I have seen discussions before about the installation location of pressure gauges, namely whether they should be installed in front of the check valve or between the check valve and the globe valve. Please share your opinions.
I think it’s better to install the pressure gauge before the check valve; installing it after the check valve causes a pressure drop.
The function of the pump inlet drain valve is to empty the liquid inside the pump during maintenance； The pump outlet vent valve is primarily used during pump startup to prevent gas from accumulating inside the pump and preventing it from building pressure, thereby allowing for gas expulsion. Can check valves and globe valves be interchanged? They cannot be swapped. Are there any with filters installed at the outlet? There is no filter on the outlet; what you might be referring to is a sight glass or observation port
Install the pressure gauge at the pump outlet first, and then the check valve
On the outlet, there is something that is many times larger in diameter than the pipe, resembling the enlarged observation section in the middle during infusion – that’s the check valve
Find a book on piping; it contains information on classic piping designs!
There are filters installed at the outlet! For example, I’ve seen a situation where there are two pipelines at the outlet of a liquid storage tank: one is a circulation pipeline that needs to be in operation continuously to cool the material, while the other is a pipeline that transports the material to the next unit. Only the outlet pipeline is equipped with a filter! ! The pump inlet is not equipped with a filter! !
Answer 5# is correct; a pressure gauge should be installed first at the pump outlet, followed by a check valve. In my opinion, the installation location is determined primarily by the function of the pressure gauge. Generally, the purpose of a pressure gauge at the pump outlet is to monitor the pump’s operation, so answer 5# makes sense.
The common practice is to install a gate valve or globe valve at the pump inlet, followed by a drain and a filter； A pressure gauge, check valve, drain valve, gate valve, or globe valve should be installed at the pump outlet first.