Why do screw pumps require frequent stator replacement?

1. The Root Causes of Frequent Stator Replacement
The stator, one of the core working components of a screw pump, is susceptible to multiple factors during operation, leading to a limited lifespan. According to the product characteristics and industry experience of Jingjiang Meijia Pump Industry Co., Ltd., the main reasons for frequent stator replacement are as follows:

Material Aging and Insufficient Environmental Adaptability: Stator materials (such as NBR, HNBR, EPDM, FKM) have varying tolerances to temperature and chemical media. If an unsuitable material is selected (for example, using ordinary NBR in high-temperature corrosive media), the stator will fail due to softening, aging, or corrosion, requiring frequent replacement.
Mechanical Wear from High-Hardness Fluids: When the pump transports media containing hard particles (such as quartz sand, metal shavings, etc.), the rubber inside the stator is eroded by mechanical friction. Over time, the stator surface wear intensifies, leading to decreased sealing performance and forcing users to replace the stator to prevent leakage.
Elastic Degradation Caused by High Temperature: In high-viscosity or high-temperature operating environments, the stator rubber loses its elasticity due to prolonged heat exposure, failing to effectively maintain the fit between the rotor and the stator. This "elastic degradation" is one of the main technical bottlenecks leading to the need for regular replacement of screw pump stators.
2. Precise Material Selection is Key to the Solution
To address the challenge of easily damaged stators, Jingjiang Meijia Pump Industry Co., Ltd. offers a variety of material options to suit different operating conditions:

NBR (Nitrile Rubber): Primarily for conventional media with medium hardness and moderate temperature, with relatively low cost, suitable for general industrial use.
HNBR (Hydrogenated Nitrile Rubber): Enhanced heat and oil resistance compared to NBR, suitable for chemical environments requiring higher durability and high-temperature resistance.
EPDM (Ethylene Propylene Diene Monomer): Possesses excellent high-temperature and ozone resistance, especially suitable for high-temperature steam or hot water systems, effectively extending the stator replacement cycle.
FKM (Fluorocarbon Rubber): The strongest in high-temperature and corrosion resistance, designed for high-acid, high-alkali, and high-temperature and high-pressure environments. Although the cost is higher, it minimizes replacement frequency.