Q:Centrifugal pumps for normal operation, is it reasonable to install valves on their inlet lines? Why?

Unreasonable, easy to produce throttling loss, pressure loss, pressure reduction, easy to cause cavitation

Q:How many kilograms of water pump are there in the automatic washing machine on the market?

Suitable for supporting high pressure sprayer, portable car washer. Water pump with overflow circuit. And comes with pressure switch, overflow switch double insurance

Q:There are second cutting, third cutting, why three times?

So some pumps are written in the back of XXXX-125A or B, that is, the impeller nominal diameter is 125, A is through a cut, B is the 2 cutting. To reach the applicable conditions, only the calculation is not enough, but also after cutting to test to determine.

Q:Why does the centrifugal pump close the pressure to start?

Therefore, the operation rules of multistage centrifugal pumps require that the inlet valve be opened before opening, and the outlet valve is closed. However, the export valve closed time can not be too long, because at this time the medium in the pump cycle, the medium temperature gradually increased, easy to cause mechanical seals, due to lack of lubrication friction and wear or damage.

Q:How to calculate the motor power of metering pump?

The motor power of the metering pump is divided into two parts1. mechanical power, this part of the power metering pump design part will be some data, mainly to control the mechanical structure of the metering pump required power

Q:Shielding pump is the main drawback of electricity? How much does it cost more than an ordinary centrifugal pump? Is there any noise in the running of the canned pump? How much is it lower than the noise of the common centrifugal pump?

The graphite bearing lubrication medium, make the operation less noise and manual, reduce maintenance costs; in recent years, bearing material added with silicon carbide SIC, super hard, life is better than that of graphite bearing.The vertical structure can be installed on the pipeline like a valve, the installation is convenient and quick, and the motor and the impeller can be drawn out only when the utility model is used, and the pipeline is not needed to be removed.The utility model can be installed and run with a shock absorber or a damping pad, so that the pump is less noisy at running time.

Q:What's the difference between non negative pressure and variable frequency water pump?

No negative pressure is superposed pressure intelligent frequency conversion equipment, pump frequency operation is no negative pressure difference, and the variable frequency pump, variable frequency pump is advanced municipal tap water tank or pool, pump from the tank or pond water pressure to set pressure to the pressure water supply, and no negative pressure directly from water the municipal pipeline, using the original municipal 2~3 kilograms of pressure

Q:What is the main difference between SK water ring vacuum pump and 2BV water ring vacuum pump?

The 2BV vacuum pump belongs to the machine pump coaxial type direct connection design. It saves space and is easy to install;The use of mechanical seals as standard configuration eliminates leakage and easy maintenance;Smooth running, low noise to 62 decibels;

Q:What are the ways of hydraulic pumps?

Check valves, such as single piston pumps, three piston pumps, etc.;The port of the valve arrangement, such as the radial piston pump.

Q:What is the pump lift voltage? And how to suppress the pumping voltage rise?

The reverse voltage and torque electric torque instead, and the motor has strong braking torque, forcing the rotor quickly stopped, but usually AC-DC-AC converter is the main power AC/DC rectifier circuit is irreversible, and therefore can not return to the power grid, resulting in the main circuit of the capacitor voltage increases two that is called the pump voltage.