Types and application fields of gear pump seals

The sealing model and application field of gear pumps are closely related to their sealing form, material selection, and working condition requirements. The following is a comprehensive compilation based on search results:

**1、 Common sealing models and forms of gear pumps**

1. * * Skeleton oil seal (such as KCB series, 2CY series)**

-* * Features * *: Self tightening lip seal, simple structure, low cost, easy maintenance, suitable for low-pressure applications (such as oil transportation).

-* * Application areas * *: Low pressure oil pumps, lubrication systems, etc.

2. * * Packing seal (such as YCB series)**

-* * Features * *: Using flexible graphite or polytetrafluoroethylene fillers, it has strong adaptability and is suitable for medium pressure and wide medium range, but requires regular maintenance.

-Application field: Corrosive medium transportation in the chemical and metallurgical industries.

3. * * Mechanical seal (universal model)**

-* * Features * *: Composed of rotating and stationary components, with low leakage and long service life, suitable for high pressure, high temperature or corrosive media.

-Application field: High pressure fluid transportation in the petrochemical and pharmaceutical industries.

4. * * Magnetic seal (such as Milton Roy magnetic drive model)**

-Features: Non contact sealing, isolating the driving part from the pump body, suitable for toxic or high-purity media.

-* * Application areas * *: Chemical additive transportation, sterile environment in the pharmaceutical industry.

5. * * Sanitary grade seal (such as Maprotec ZRP01 series)**

-* * Features * *: Made of stainless steel material, the surface is smooth and easy to clean, meeting food grade standards, suitable for high viscosity materials.

-* * Application areas * *: Food processing (such as sauce and honey), and transportation of pharmaceutical raw materials.

**2、 Application fields of gear pump seals**

1. Chemical and petroleum industries**

-Sealing requirements: Corrosion resistance and high pressure resistance (such as fluororubber seals and mechanical seals).

-* * Application scenario * *: Transporting crude oil, fuel oil, acid-base solutions, etc., commonly using Weser Pumpen's WP340-1/404 model.

2. * * Food and Pharmaceutical Industry**

-Sealing requirements: Sanitary grade design (stainless steel material, no dead corners structure), such as Maprotec's ZRP01 series.

-* * Application scenario * *: Transporting jam, drug solution, high viscosity ointment.

3. * * Paper and textile industry**

-Sealing requirements: Wear resistant and high temperature resistant (corrugated structure sealing ring).

-* * Application scenario * *: Conveying slurry, dye, ink, commonly used packing sealing or end face sealing design.

4. * * Agriculture and Horticulture**

-Sealing requirements: Wear resistant and low-cost (such as nitrile rubber sealing rings).

-Application scenarios: Spraying pesticides, irrigation systems, often using skeleton oil seals or threaded seals.

5. High temperature melt treatment (such as extrusion industry)**

-Sealing requirements: high temperature resistance and resistance to compression deformation (sealing with a stopper or metal ring).

-* * Application scenario * *: Melt plastic and rubber conveying, commonly used melt gear pump flange sealing form.

**3、 Optimization design and selection suggestions**

1. * * Material selection * *:

-Nitrile rubber (NBR): Good oil resistance, suitable for gear pumps in lubrication systems.

-Fluororubber (FKM): resistant to high temperatures (above 200 ℃) and corrosive media, used for chemical pumps.

2. * * Structural Design * *:

-Double lip seal: enhances sealing effect and reduces leakage under high pressure environment.

-Ripple structure: Suitable for elastic deformation requirements at high speeds and temperatures.

3. * * Working condition adaptation * *:

-Mechanical seals or end face sealing designs are preferred for high-pressure scenarios.

-The food industry needs to comply with hygiene standards and avoid using seals containing toxic materials.

**4、 Typical manufacturers and model examples**

-Weser Pumpen: WP340-1/404 (Petrochemical).

-Maprotec: ZRP01 (Food and Pharmaceutical).

-Milton Roy: Milroyal series (high-precision chemical injection).

-Cangzhou Shiqi Pump Industry: ZYB series (medium pressure chemical pump).

**Summary**

The sealing selection of gear pumps should comprehensively consider the characteristics of the medium (viscosity, corrosiveness), pressure, temperature, and industry standards. For example, the food industry prioritizes the use of sanitary grade stainless steel seals for stainless steel gear pumps, the chemical industry requires corrosion-resistant fluororubber, and high-pressure scenarios rely on mechanical seals or end face closure designs. For specific models and applications, please refer to the manufacturer's technical manual (such as Weser, Maprotec, etc.)

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