Changsha Zoomlian Pump Co., Ltd. 长沙中联泵业股份有限公司

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    • Dosing pump
    • Dosing pump

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    Dosing pump

    Flow: 0.7~200l/h

    Pressure: 1.5~20bar

    Price: 0.2~198,000

    The dosing pump is a positive displacement pump, also known as a fixed volume pump or proportional pump. The dosing pump is a type of machinery for transporting fluids, whose outstanding feature is that it can maintain a constant flow regardless of the discharge pressure. The use of dosing pumps allows for the simultaneous functions of transport, dosing, and regulation, thus simplifying the production process. By using several dosing pumps, various media can be introduced in precise proportions into the process for mixing. Dosing pumps are widely used in the pharmaceutical, food and beverage, and petrochemical industries.

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    Product parameters

           The dosing pump is a positive displacement pump, also known as a fixed volume pump or proportional pump. The dosing pump is a type of machinery for transporting fluids, whose outstanding feature is that it can maintain a constant flow rate regardless of the discharge pressure. The use of dosing pumps allows for the simultaneous performance of transportation, dosing, and regulation functions, thus simplifying the production process. By using several dosing pumps, various media can be introduced into the process in precise proportions for mixing. Dosing pumps are widely used in industries such as pharmaceuticals, food and beverages, and petrochemicals, handling materials with high corrosivity, high toxicity, high viscosity, and high pressure.

    Structure of the dosing pump 
    The pump is composed of three parts: motor, transmission box, and cylinder body. 
    The transmission box is composed of a worm screw mechanism and gear, a stroke adjustment mechanism, and a connecting rod and crank mechanism; by rotating the adjustment wheel, a high stroke adjustment is made, thus changing the eccentricity of the moving shaft to modify the stroke of the piston. 
    The cylinder body is composed of the pump head, the suction valve assembly, the discharge valve assembly, the piston, and the packing seals. 
     
    Operating principle of the dosing pump 
    The motor, through the coupling, drives the worm screw and through the reduction gear causes the main shaft and the eccentric wheel to perform a rotary motion. The eccentric wheel drives the sliding seat of the arc-shaped arm to perform a reciprocating motion. When the piston moves to the rear dead center, a vacuum is formed in the pump chamber, the suction valve opens, and the liquid is drawn in; when the piston moves to the front dead center, the suction valve closes, the discharge valve opens, and the liquid is discharged as the piston advances. The continuous reciprocating work of the pump forms a constant, pressurized, and dosed liquid flow. 
     
    Adjustment of the flow rate of the dosing pump 
    The adjustment of the pump flow rate is made by rotating the adjustment wheel, which drives the adjustment screw to change the distance between the arc-shaped connecting rods, modifying the stroke of the piston within the pump chamber to determine the flow size. The scale of the adjustment wheel determines the stroke of the piston, with an accuracy of 95%. 

    Product parameters

    Diaphragm dosing pump
    This type of dosing pump can be divided into three categories according to the mode of operation: mechanical diaphragm dosing pump, hydraulic diaphragm dosing pump, and electromagnetic diaphragm dosing pump. The plunger dosing pump is a volumetric reciprocating pump, used for precise dosing, with a flow error generally not exceeding ±1%. As an ideal equipment for precise dosing and addition of fluids, the diaphragm dosing pump can meet various process needs and is used to transport various liquids (especially corrosive liquids). Its flow can be continuously adjusted from 0 to 100%.
     
    Features:

    1. Wide flow, good passage performance. Allows the passage of particles up to 10 mm in diameter. When pumping sludge and impurities, the wear of the pump is very low;

    　　2. The height and flow can be continuously adjusted by opening the air valve (air pressure adjustment between 1 and 7 bar):

    　　3. This pump has no rotating parts, has no shaft seal, the diaphragm and the pumped medium are completely separated from the moving parts and components of the pump, so the pumped medium will not leak to the outside. Therefore, when pumping toxic, volatile, or corrosive media, there is no environmental contamination or danger to personal safety;

    　　4. Does not require electricity. It is safe and reliable for use in flammable and explosive places.

    　　5. Can work submerged in the medium:

    　　6. Simple structure, few wear parts. This pump has a simple structure, easy to install and maintain. The pumped medium does not come into contact with the air valve, the connecting rod, or other moving parts, unlike other types of pumps where the wear of rotors, plungers, gears, or vanes gradually reduces performance:

    　　7. Easy to use, reliable operation, starting and stopping only require opening and closing the air valve. Even if due to unforeseen circumstances the pump runs without medium for a long time or stops suddenly, it will not be damaged. In case of overload, the pump stops automatically, with self-protection function, and restarts automatically when the load returns to normal;

    　　8. Can transport viscous liquids (viscosity less than 10,000 cP):

    　　9. This pump does not require oil lubrication, not even when empty, without affecting the pump, this is a feature of the pump.

    　　10. Does not need priming with water. The suction height reaches up to 5 m. The lifting height reaches 50 m. Output pressure ≥ 6 kgf/cm².

    Parameter table:

    Model Flow (L/min) Lifting height (m) Suction height (m) Working pressure (kg) Diameter (mm) Air inlet diameter (in) Maximum particle diameter (mm) Air consumption (m³/min) Recommended air compressor power (kW)
    QBY3-1017703710 1/4 1.50.23
    QBY3-1517703715 1/4 1.50.23
    QBY3-2050704720 1/4 2.50.363
    QBY3-2550704725 1/4 2.50.363
    QBY3-25A1008058.325 1/2 30.675.5
    QBY3-321508058.332 1/2 40.675.5
    QBY3-401508058.340 1/2 40.675.5
    QBY3-503408058.350 1/2 50.97.5
    QBY3-653408058.365 1/2 50.97.5
    QBY3-805708058.380 1/2 6 1.5～2.0 11～15
    QBY3-1005708058.3100 1/2 6 1.5～2.0 11～15
    QBY3-12510008058.3125 3/4 10518.5
    QBY3-15010008058.3150 3/4 10518.5
     
     
    Plunger dosing pump
    This type of dosing pump is suitable for transporting liquids that do not contaminate the atmospheric environment. Since the plunger dosing pump uses packing sealing, there may be a slight drip. If leaks are not allowed, it is recommended to use a diaphragm dosing pump. Plunger dosing pumps are mainly divided into single plunger dosing pump and double plunger dosing pump. The single plunger pump is a small or medium pump, and for higher flow and pressure requirements, the double plunger dosing pump is recommended.
     
    Features:
    ◆ High cost-performance ratio, good self-priming capacity, small dead space, valves with special design ◆ Heating/cooling jacket ◆ Sealing washing structure ◆ Special design sealing ◆ Option: pump head with insulating jacket, easily removable valves
     
     
    Parameter table:
     
    Electromagnetic diaphragm pump
    New electromagnetic structure design, robust and durable, expanded stroke speed range (1-100/min), combined with standard stroke length range (30-100%), allowing for more precise dosing of chemicals. NEMA4X/IP65 protective housing, power button, transparent cover with locking option. During the operation of the pump, the stroke indicator light flashes. The metal sealing ring is eliminated, using universal parts applicable to all sizes and structures, simplified connection hose design and robust. External equipment interface with industrial electrical connector IP-68 for water cut-off. Optional: low-level float switch, connected to the new low-level head (3 pins) and low-level indicator light, alarm when the level is too low. Can accept pulse signals for external control through the external connector (5 pins).
     

    Features:

    1. Corrosion-resistant plastic housing, PTFE diaphragm, protection grade IP55. Optional pump head material: PP, PVC, PTFE, double unidirectional ball valve, manual frequency adjustment: 0-100%, current frequency display on panel, manual stroke adjustment: 0-100%.

    2. Remote control for on/off and level for the dosing pump.

    3. Power supply: 220VAC 50/60HZ single-phase.

    4. Features of the electromagnetic dosing pump: low noise, flow varies little with fluctuations in external back pressure, no backflow when the pump stops.

     

    Parameter table:

    Changsha Zhonglian Pump Industry Co., Ltd.

    Why Choose Us?

    Changsha Zhonglian Pump Industry Co., Ltd. was established in 1989, following the reform of the Changsha Water Pump Factory. It is a national high-tech comprehensive enterprise integrating design, research and development, manufacturing, and service. The company was listed on the Hunan Provincial Stock Exchange on December 31, 2019, with the abbreviated name "Zhonglian Pump Industry" and stock code: 600275HN. It is currently a key enterprise in China's centrifugal pump industry and one of the leading domestic manufacturers of multi-stage pumps, headquartered in Changsha, Hunan, a historical and cultural city in China.

    Changsha Zhonglian Pump Industry Co., Ltd.
    Changsha Zhonglian Pump Industry Co., Ltd.

    FAQ

    Q

    What products do you mainly produce?

    A

    Zoomlion Pump Industry manufactures various large industrial centrifugal pumps. The main products include: self-balancing multistage pumps, multistage centrifugal pumps, single-stage centrifugal pumps, split-case pumps, chemical pumps, submersible pumps, pipeline pumps, long-shaft pumps, condenser pumps, and more.

    Q

    Can you help me choose a model?

    A

    Of course! If the water pump model is not selected accurately, it can cause significant problems. After you take it back, it might be either too small to meet the usage requirements or too large, resulting in higher electricity and fuel costs, increasing the operating expenses.

    Q

    Why is the price quotation so slow?

    A

    Because centrifugal pumps are non-standard custom products with many models and a wide price range. Even for the same model, the price varies greatly depending on the materials and configurations used. Taking the most common pump accessory—the impeller—as an example, the price of a stainless steel impeller is several times that of a cast iron impeller. Therefore, we need to clearly confirm the relevant information to provide you with an accurate price. Normally, if you provide comprehensive information, we can quote within 5 minutes.

    Q

    What information should I provide when I need a quote?

    A

    Usually, if you want to get an accurate quote, it is recommended that you provide us with the following information: pump flow rate, head, on-site operating voltage, frequency, temperature of the conveyed liquid, pH value, solid particle content, on-site installation conditions (horizontal or vertical installation), and other related details. If you are not very familiar with these, it’s okay; our sales manager will assist you in determining them.

    Q

    Do you have centrifugal pumps in stock?

    A

    There are many models and configurations of centrifugal pumps. Except for a small number of commonly used standard models that are in stock, the vast majority of models and configurations are not stocked and are customized products. We need to first select the pump based on your site conditions such as flow rate, head, medium temperature, pH value, and installation conditions. After determining the pump model and configuration, we can then place an order with the workshop for production.

    Q

    What is your usual delivery time?

    A

    Models in stock can be shipped by the next day at the latest. Others are custom-made, and depending on the product size and specific project conditions, the delivery time is generally between 7-90 days. Please consult our sales manager for details: 0731-88632200 。

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