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Precision Mechanical Seals & Advanced Ceramics

Ningbo Donglian Mechanical Seal Co., Ltd. (Dyseals) – A National High-Tech Enterprise since 1992. ISO9001, ISO14001, and FDA certified manufacturer of mechanical seals, ceramic components, bullet-proof plates, and precision metal parts for global industrial applications.

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About Dyseals

Founded in 1992, Ningbo Donglian Mechanical Seal Co., Ltd. (Dyseals) is a National High-Tech Enterprise with a Provincial Research and Development Center. We specialize in high-performance sealing solutions and advanced ceramic materials for demanding industrial environments.

Dyseals Manufacturing Facility

30+ Years of Engineering Excellence

With over 300 employees and a facility spanning 32,000 square meters, we combine advanced ERP systems with precision manufacturing to deliver reliable sealing solutions across automotive, industrial, chemical, agricultural, and household pump applications.

Our R&D team developed ceramic plates used in the Tiangong-2 space laboratory in 2015, showcasing our capability in cutting-edge material science and engineering.

32,000 m²
Production Area
300+
Employees
1992
Founded
30+
Countries Served

Our Product Range

From high-performance mechanical seals to bullet-proof ceramic armor, we manufacture precision-engineered components using SSiC, SiC, tungsten carbide, carbon, ceramic, and boron carbide materials.

Mechanical Seal DYALF-D-317

Mechanical Seal DYALF-D-317

O-ring type mechanical seal designed for industrial pumps with high reliability and extended service life.

O-Ring Seal DY41

O-Ring Mechanical Seal DY41

Compact design for automotive water pumps, resistant to high temperatures and chemical exposure.

Seal DYF09-90

Mechanical Seal DYF09-90

High-pressure mechanical seal for chemical pumps, featuring corrosion-resistant materials.

Seal DYGRF

Mechanical Seal DYGRF

Robust design for agricultural irrigation pumps, offering excellent wear resistance.

SiC Seal Rings

SiC Mechanical Seal Rings

Silicon carbide seal faces for extreme temperature and abrasive environments.

SSiC Armor Plates

SSiC Bullet-Proof Plates

Advanced ceramic armor solutions for defense and security applications.

Ceramic Shafts

99.5% Ceramic Shafts

High-purity alumina shafts with excellent wear and corrosion resistance.

Rubber Bellows

Rubber Bellows & O-Rings

Available in NBR, FKM, EPDM, Silicone, Neoprene, HNBR, and encapsulated types.

Tungsten Carbide

Tungsten Carbide Seal Rings

Extreme hardness and wear resistance for heavy-duty industrial sealing.

Carbon Seal Faces

Carbon Mechanical Seal Faces

Self-lubricating carbon seals ideal for dry-running and low-lubrication conditions.

Boron Carbide Armor

Boron Carbide Bullet-Proof Plates

Ultra-lightweight, high-efficiency armor material for ballistic protection.

Stainless Metal Parts

Stainless Steel Metal Parts

Precision parts in 304, 316L, 329, and 2205 duplex stainless steel.

Why Choose Dyseals?

We combine advanced materials, precision engineering, and rigorous quality control to deliver sealing solutions that perform under the most demanding conditions.

Certified Quality

ISO9001:2015, ISO14001, and FDA certified manufacturing processes ensure consistent quality and compliance.

High-Tech Enterprise

Recognized National High-Tech Enterprise with a Provincial R&D Center and ERP-integrated operations.

Advanced Materials

Specializing in SSiC, SiC, boron carbide, tungsten carbide, and high-purity ceramics for extreme environments.

Global Reach

Serving customers in over 30 countries with reliable delivery and technical support.

1992
Founded
32,000 m²
Facility Size
300+
Team Members
30+
Countries Served

Frequently Asked Questions

What materials do you use for mechanical seals?

We manufacture seals using SSiC, SiC, ceramic, tungsten carbide, carbon, and various elastomers including NBR, FKM, EPDM, and silicone.

Are your products certified?

Yes, we are ISO9001:2015, ISO14001, and FDA certified, ensuring our manufacturing processes meet international quality and environmental standards.

Do you supply bullet-proof ceramic plates?

Yes, we produce SSiC, boron carbide, and ceramic bullet-proof plates and body armors. Our ceramic plates were used in the Tiangong-2 space laboratory in 2015.

What industries do you serve?

We serve automotive, industrial, chemical, agricultural, household pump, defense, and aerospace industries with customized sealing and ceramic solutions.

Get in Touch

For inquiries, quotes, or technical support, please visit our official website to contact Ningbo Donglian Mechanical Seal Co., Ltd.

Visit Official Website

Headquarters

6 Mingshu Road, Jiangshan Science and Technology Zone,
Ningbo, China. 315191

Contact Information

Phone (China): +86-574-88452354

Phone (Intl): +86-574-88452348

Mobile: +86-13757416548

Email: sales@china-dongya.com

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