Portable Self-priming Single Suction Centrifugal Pump

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Structure and operating principles of Portable Self-priming Single Suction Centrifugal Pump


Diesel engine driven self-priming pump is composed of diesel engine, coupling, pump body, impeller, rear cover, mechanicalseal, pump spindle, bearing block, imported pump, gas-liquid separator tube, water valve and drain connection. The structure of the pump is shown in the following figure.

Principle of operation: The pump body with fluid reservoir inside and the working chamber of the pump, being connected with each other through the reflowingvalve on the upper side and circulation valve beneath it, form the axial-flow outer recirculation system of the pump. When the pump stops working, it already has a volume of liquid reserve inside its fluid reservoir, when the pump runs, the liquid inside is ejected upward with the air flow under the function of impeller, then it reflows into the working cavity through the gas-liquid separator tube, at the same time, the gas is exhausted out of the pump, which makes the pump vacuumed inside so as to get self-priming realized.


Preparations of Portable Self-priming Single Suction Centrifugal Pump


  • Check the fasteners of the joint parts, such as the pump seat, the coupling and the bearing carrier, and make sure that they would not loosen. If any of them get loose, you should fasten them.

  • Check the connecting pipes and make sure that there is no gas leakage.

  • Switch on the water valve on the top of the pump, add a volume of water,which is no less than 2/3 of the pump volume. Then switch off the water valve. The next time you start the pump, you never need to do water-injection anymore.

  • Get the power line of the storage battery routed to the power source , when the diesel engine is power-on, press down the starting button of the meter panel,  give it a test run to see if it rotates clockwise (counterclockwise rotation is prohibited). 

  • Starting up: Add antifreezingsolution to the water tank of the diesel engine, and fill the fuel tank with diesel oil,then add some lubricating oil (labeled 10w-40)to the engine. Route the power line of the starter to the storage battery and pay attention to the positive and negative poles.

Working Conditions of Portable Self-priming Single Suction Centrifugal Pump


  • Altitude: ≤2500m

  • Ambient temperature: -25-55℃

  • Relative air humidity:9-95%

  • seismicintensity:7

  • Flow Range: 50-70(L/S)

  • Head Range: 5-70m


FAQ of Portable Self-priming Single Suction Centrifugal Pump

  • How can I get trained on CNBM products?

    Yes, we provide training courses in our factory (products, general and specific pump technology, hydraulics, and practical applications). Please consult your sales manager or get in touch with our headquarters for more information.

  • Are your pumps cheaper than those of your competitors?

    CNBM aims to give its customers the highest standards of quality and service and delivery times, all at a reasonable price.

  • Do you have self-priming pumps?

    Yes, our product portfolio also includes two ranges of self-priming pumps: self-priming electric pumps and self-priming side channel pumps.

  • Is it really necessary to fit a bleed valve for the boxes?

    It is always best to have a bleed valve as the gas produced by the fermenting sewage is potentially hazardous.

Portable Self-priming Single Suction Centrifugal Pump

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