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How to choose the right cast iron gear pump

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  1. Work stress
    The working pressure of the gear pump is a key factor in the selection. Different types of pumps can withstand different maximum pressures, usually in the range of 150-300 bar.
    If the system pressure is high, choose a gear pump that can withstand high pressure to avoid pump body damage or premature damage.
    Ensure that the rated pressure of the pump is higher than the actual working pressure of the system, and leave an appropriate safety margin.
  2. Traffic requirements
    According to the working requirements of the hydraulic system, the required flow rate is determined, that is, the volume of liquid passing through the gear pump per minute, usually expressed in **L/min (L/min) **.
    The flow rate depends on the pump displacement and speed. Displacement is usually expressed as the volume of fluid per transfer (e.g. cm³/rev). The calculation formula is as follows:
    Flow rate = displacement x speed
    Select the appropriate flow rate according to the load requirements of the system. Too much flow will waste energy, and too little will affect the efficiency of the device.
  3. Speed
    The speed of the gear pump is an important parameter to be considered when selecting. Generally, the speed range of cast iron gear pumps is 500-4000 RPM.
    According to the speed of the driving equipment, choose the appropriate gear pump. If the pump speed is too high, it may lead to increased noise or excessive wear; If it is too low, the traffic output will be affected.
  4. Viscosity of liquid medium
    Cast iron gear pump is suitable for the transmission of high viscosity liquids, such as hydraulic oil, lubricating oil and so on. The gear pump should be selected according to the viscosity range of the liquid to be transported.
    If the viscosity of the fluid is too low, the efficiency of the pump may be reduced. Too high viscosity may cause difficulty in pump operation. Generally, gear pumps are suitable for liquids with viscosity ranging from 10 to 3000 cSt.
  5. Installation method of pump
    Select the appropriate pump type according to the installation position of the pump, including flange connection, axial connection and so on. Ensure that the pump installation interface matches the device interface to avoid subsequent installation problems.
    To consider the import and export direction and space needs, especially in the limited space, choose a small volume, flexible installation of the pump.
  6. Noise and vibration
    Gear pump may produce large noise and vibration under high pressure and high speed conditions. If the application environment has strict noise requirements (such as agricultural machinery, precision equipment), you can choose a low-noise model or install a shock absorber.
    Some gear pumps are specially designed to significantly reduce noise and vibration during operation.
  7. Efficiency and power requirements
    The volume efficiency and total efficiency of gear pump directly affect the energy consumption and performance of the system. Usually efficient pumps can reduce the energy consumption of the hydraulic system and extend the service life of the pump.
    Power requirements: The power requirements of the gear pump depend on the flow and working pressure of the pump, which can be calculated by the formula:
    Power (kW) = flow rate (L/min) × pressure (bar) ÷ 600
    Ensure that the power of the pump matches the needs of the system and avoids underpower or waste.
  8. Pump durability and materials
    Cast iron gear pumps are durable and suitable for long working hours in harsh environments. Cast iron material has strong wear resistance and corrosion resistance, especially suitable for high load, frequent use of the occasion.
    However, it should be noted that if the liquid is corrosive or contains particles, special materials may need to be selected or a filter device may be added to the pump.
  9. Brand and after-sales service
    Choose well-known brands of cast iron gear pumps to ensure product quality, performance and durability, and to obtain reliable technical support and after-sales service.
    Reliable after-sales service is particularly important in the installation, commissioning and maintenance of the pump, which can improve the stability and efficiency of the system.
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