Why is the water pump usually used multi-stage pumps, while the circulating pump is usually a single-stage pump?
Pump selection is based on flow, lift, power to determine, the actual situation is different, the choice of pump specifications and models are different, the key to your needs to choose.
Mainly determined by the function of the water supply pump and the circulation pump.Replenishment pump is mainly to supplement the loss of the system, so the general flow is smaller, larger head, single pump water model in a small flow situation, many are not up to the required head, can only use multi-stage pumps.Circulating pumps are generally large flow, low lift, heavy efficiency, economic operation, and hydraulic model point of view, are single-stage pumps more appropriate, especially single stage double suction pump.
The circulating pump is usually used in the closed-loop system, circulating pump will be generated when the pump pressure, the pressure is also said, and the suction pump up is in normal pressure system, the outlet of the closed-loop system, when the system pressure is 0.1MPa, the water pump for water system needs higher than 0.1MPa, the difference of pressure difference the greater the water faster, on the contrary, the smaller the slower the pressure difference; so the normal work must want water pump outlet pressure is greater than the system pressure. The replenishment pump is usually multi-stage pumps, and circulating pumps are usually single pump is wrong, as long as the replenishment pressure difference to meet the requirements, multi-stage pumps and single-stage pumps are not affected.(single stage pump and multi-stage pump difference: 1, single-stage pump water level "is a wheel is a level", an impeller, no other brothers and sisters for help; and a plurality of multi-stage pump impeller, there are brothers and sisters for its help, so that his ability to work is high. Just as a man works alone and a lot of people work together, the work is differentTherefore, as long as the design requirements are met, it is not important to select multi-stage pumps and single-stage pumps.
