I would like some advice on the installation of pumps, pipes, and valves
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I’ve been unable to figure out a few issues, so I’d like to ask for help from all you helpful friends. First, the recirculation pump is a GW pump – are valves needed at both the front and the back? Why? Should a butterfly valve or a globe valve be used generally? Where are check valves generally installed? Second, are reducer pipes required before and after the GW pump? Why? What is used to calculate the diameter of a reducer? Why is it necessary to use an eccentric pipe? Third, apart from pipeline sewage pumps, do other pumps require diameter changes?
Valves are generally installed in front of the pump, and the type of valve is chosen based on the pipe diameter: butterfly valves are used for diameters greater than 30, while globe valves are used for diameters less than 10. In cases where a high head is required, reduced-diameter valves are typically used.
1. To facilitate maintenance, valves need to be installed at both the inlet and outlet of the pump; considering the need for a tight seal, globe valves are generally used. A check valve is installed at the pump outlet to prevent backflow of liquid in the pipeline.
II. Generally, when pumps leave the factory, the diameters of their inlet and outlet flanges are not large. You can consult the pump’s performance curve; to meet the required flow rate, the piping used must generally have a larger diameter than that of the pump itself.
III. In actual use, the inlet and outlet pipe diameters of most pumps require diameter reduction.
Valves should be installed before and after the pump, and their selection is determined based on the medium and pipe diameter. A check valve is installed at the outlet to prevent backflow and protect the pump from water hammer. The pump inlet and outlet usually require diameter changes (smaller at the inlet, larger at the outlet)
First, the recirculation pump is a GW pump – are valves needed at both the front and the back? Why? Should a butterfly valve or a globe valve be used generally? Where are check valves generally installed?
First, the recirculation pump is a GW pump – are valves needed at both the front and the back? Why? Should a butterfly valve or a globe valve be used generally? Where are check valves generally installed? Valves need to be installed at the beginning and end for maintenance purposes
First, the recirculation pump is a GW pump – are valves needed at both the front and the back? Why? Should a butterfly valve or a globe valve be used generally? Where are check valves generally installed? Generally, butterfly valves and gate valves are used; globe valves are not employed (as they are difficult to clear when blocked) ； A check valve is installed at the pump outlet.
Second, are reducer pipes required before and after the GW pump? Why? What is used to calculate the diameter of a reducer? Why is it necessary to use an eccentric pipe? To ensure that the pump chamber is fully filled with liquid, the size is generally reduced by one grade, such as DN100/DN80
Third, apart from pipeline sewage pumps, do other pumps require diameter changes? Pumps of the centrifugal type all require it, while positive-displacement pumps generally do not, as vacuum formation is less likely to occur