FAQ

Our company leverages industry-leading expertise to provide every client with systematic and in-depth mechanical seal warranty and training services, aiming to equip clients with comprehensive product knowledge and ensure they benefit from continuous and reliable technical support.
Through detailed analysis of core knowledge and practical techniques—including mechanical seal structure types, fault diagnosis methods, preventive maintenance strategies, professional repair processes, and replacement criteria—trainees will develop the ability to independently address complex sealing issues. This will significantly enhance equipment operational stability and production efficiency.
  • Q What types of equipment require mechanical seals?

    A
    Essentially, any rotating equipment that requires sealing against potential leakage can be equipped with mechanical seals. We typically categorize mechanical seals by application into the following main types:
     
    1. Mechanical seals for water pumps, vacuum pumps, and circulating pumps.
     
    2. Mechanical seals for chemical pumps, circulating pumps, and compressors.
     
    3. Mechanical seals for mixing equipment and reaction kettles.
     
    4. Mechanical seals for sewage pumps.
     
    5. Mechanical seals for slurry pumps.
     
    6. Mechanical seals for papermaking equipment and pressure screens.
     
    7. Mechanical seals for high-temperature oil pumps.
  • Q What are the basic structural components of a mechanical seal?

    A
    All mechanical seals consist of three main parts:
     
    1. At least one pair of sealing faces, comprising a rotating ring face and a stationary ring face, primarily categorized as either integral sealing faces or inserted sealing faces.
     
    2. A series of secondary sealing components, typically made of flexible materials such as O-rings, gaskets, and V-rings.
     
    3. Other components on the mechanical seal, such as gland rings, compression rings, screws, springs (mainly wave springs, single springs, and multiple springs), retaining rings, circlips, shaft sleeves, bellows (mainly rubber bellows and metal bellows), etc.
  • Q What is a mechanical seal? Under what circumstances does my equipment require a mechanical seal?

    A A mechanical seal is a device or system that utilizes compensating elements to achieve perfect closure of the sealing faces, thereby preventing leakage from the rotating shaft of equipment under specific operating conditions involving pressure, temperature, rotational speed, and various media. Generally, if your equipment contains a rotating component, such as a shaft, and you need to prevent gas or liquid from leaking from one side of the shaft to the other, your equipment requires a mechanical seal.
  • Q Why choose Hongmi Mechanical Seals?

    A
    Zhejiang Hongmi Technology Co., Ltd. was established in 2003. Hongmi Mechanical Seals has now designed and produced over 1,000 different types of mechanical seals. Hongmi's technical staff is highly experienced, and we currently serve over 100 overseas clients in addition to our domestic market. Some of our long-term clients include: Southern Pump, Nanyuan Pump, Leo Pump, Nanpump Fluid, etc.
     
    All Hongmi products and production processes are strictly controlled under the ISO9001:2015 quality management system.
     
    The mechanical seals designed and manufactured by Hongmi possess product quality and performance comparable to world-renowned brands such as EagleBurgmann, John Crane, and Grundfos. The service life of Hongmi Mechanical Seals can reach no less than 80% of that of similar products from these international brands. Hongmi Mechanical Seals use raw materials of the same grade as these international brands to maintain high product quality. Without compromising on quality, the complete unit price of Hongmi Mechanical Seals is only 40% to 60% of that of leading international brands. As a domestic alternative to internationally famous mechanical seal brands, Hongmi Mechanical Seals offers significant cost advantages.

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+86-138-0682-0032
​Copyright © 2025 Zhejiang Hongmi Technology Co., Ltd. All Rights Reserved.

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