跳至主要内容

Why the outlet valve need to be closed when the first time of centrifugal pump started

Why the outlet valve need to be closed when the first time of centrifugal pump started.

Water pump Start closing pressure means when you start the centrifugal water pump at first time if there is no water in the pipeline,you ‘d better close the outlet pipe valve.
Why？because at the first time ,there is no water in the pipe,in the case of zero flow, the electric pump head is the highest,the power is minimum,With the opening of the outlet valve increased,the flow rate increases, the head decreases, and the power increases, efficiency increases maximum,If the outlet valve is fully opened at firt time , the flow of the pump may deviate from the rated flow , the water pump efficiency is also reduced a lot,
As a result, the shaft power is greater than the motor power, causing tripping or even burning the motor.Therefore, the operation rules of multistage centrifugal pumps require that the inlet valve be opened before starting, and the outlet valve shall be closed.However, the outlet valve closed time can not be too long, because at this time the liquid in the pump cycling, the liquid temperature gradually increased, easy to cause mechanical seals, due to lack of lubrication friction and wear or damage.
Gelaili pump industry provide you the best centrifugal water pump,company flagship product:booster pump,aquarium water pump,stainless steel ro booster pump,fire pump,coolant pump,shower pump,,dewatering pump.
More information,please visit:http://www.jxgllpump.com


标签：

评论

发表评论

此博客中的热门博文

Causes of Electric Motor Burning by Water pump

1. First, find out whether the motor burns the bearing (mechanical fault) or the coil (electrical fault). If it is the fault of burning coil, it is mainly caused by overcurrent, sometimes too high or too low voltage will also cause the coil to heat and short circuit, so check that the voltage when running is too different from the rated voltage.There may be several reasons for over-current short-circuiting: A. the equipment is overloaded to make the motor run for a long time at rated or over rated current. In particular, the starting current of the motor is 3-5 times that of the rated current. Therefore, we should try to avoid running with load or full load when starting the equipment (mainly depending on the matching allowance of rated current and normal operating current of motor). B, the motor works in a wet working environment. The insulation of the coils should be checked before the motor starts. The insulation requirements of different voltage grades are also different. May r...
发表评论
阅读全文

The advantages of the stainless steel centrifugal pump

The stainless steel  centrifugal water pump  can be used to convey various medium from tap water to industrial liquid at different temperature with different flow and pressure.the stainless steel  centrifugal water pump  can be used to transport the liquid,which PH Value is 5-9,the liquid can be slightly alkaline water,take off a mineral water,distilled water,swimming pool water,chloride liquid, they are anti-corrosion pumps. Stainless steel  centrifugal water pump  can last for a long time, stainless steel gear pump because the high quality material and light weight rotating parts, the stainless steel  centrifugal water pump  life expectancy is much longer than the ordinary pump. Gelaili pump industry ,supply professional stainless steel water pump. www.jxgllpump.com
发表评论
阅读全文

Pressure fluctuation propagation of a pump turbine at pump mode under low head condition

Pressure fluctuation at the vaneless space and vanes passages is one of the most important problems for the stable operation of a pump turbine. The fluctuation appears in any operating condition. Much research has been done on the pressure fluctuation of hydraulic machinery. However, the details of pressure fluctuation propagation of the pump turbine at the pump mode have not been revealed. The modern pump turbine with high water head requires the runner to be “flat”, which would induce pressure fluctuation more easily than the low head pump turbine. In this article, a high head pump turbine model is used as the research object. As the pressure fluctuation at off-design point is more serious than at the design point, the low head condition is chosen as the research condition. Pressure fluctuation at the vaneless space and vanes passages is predicted by the computational fluid dynamics method based on k- shear stress transport model. The experiment conducted on the test rig of the Har...
发表评论
阅读全文