Industries
Hydraulic Rubber and Plastic Seal Successful Case
Our company's complete set of sealing production equipment is imported from the moldless processing production line produced by DMH in Austria. Hydraulic seals are suitable for use on various columns and jacks of coal mine comprehensive mining hydraulic support. It makes full use of the complementary properties of materials and has the advantages of small friction coefficient, long service life, and easy installation. Its specifications and dimensions can be fully matched with the existing column and jack groove dimensions, and it is a selected replacement product for coal mine comprehensive mining hydraulic support seals.
Our hydraulic seals combine advanced polymer formulations and precision manufacturing to meet the extreme demands of mining hydraulic supports and other heavy-duty hydraulic systems. By matching material properties (hydrolysis resistance, low compression set, controlled friction) to application conditions, these seals extend service life, improve system reliability and reduce maintenance downtime.
1. The raw materials are polymer materials specially used for coal mine hydraulic supports, which are resistant to hydrolysis, expansion, and small in compression, and can maintain a good sealing state for a long time.
2. Our company's series of seals have "standard" and "non-standard" boundaries, and can design and process seals of any size and any cross-section at any time according to user needs.
3. The sealing structure and size are always synchronized with the design and manufacturing of major coal mining machines. The unique process ensures the processing accuracy and sealing reliability of the product.
4. The piston seal has low dynamic friction under high pressure, good stability and long service life. Choosing our company's seal can maximize the effectiveness of the fully mechanized mining support, achieve stable support pressure and high reliability, and ensure safe production in coal mines. Reduce the number of shutdowns and extend the maintenance period of hydraulic supports, thereby improving the production efficiency of the entire fully mechanized mining face and reducing safety accidents. Save coal mining costs and enhance the competitiveness of enterprises in the market.
◆ Custom Hydraulic Seals: Tailored solutions for coal mining equipment, including piston seals, rod seals, and wipers, with 0.01mm tolerance via Austrian DMH moldless production lines.
◆ Material Selection: Hydrolysis-resistant polymer compounds (tested to 30,000h lifespan under MA certification), with optional flame-retardant/anti-static additives for explosive atmospheres.
◆ Cross-Section Optimization: Finite Element Analysis (FEA)-supported design for dynamic sealing performance at pressures up to 500bar (7,250psi).
◆ 24/7 Critical Response: Expedited production (72hr lead time) for mine downtime emergencies, including reverse engineering for obsolete seal profiles.
◆ On-Site Technical Support: Field installation guidance and pressure testing protocols compliant with GB/T 3452.3-2021 standards.
◆ Retrofit Kits: Drop-in seal assemblies for legacy hydraulic supports (compatibility with JOY, Eickhoff, and domestic OEM groove dimensions).
◆ System Upgrades: Integrated sealing systems combining polyurethane/polyacetal components to replace traditional O-ring/gland configurations.
We select materials based on application profiles:
Polyurethane (PU) for high wear resistance and good extrusion strength in heavy-duty piston seals;
HNBR / NBR for oil compatibility and hydrolysis resistance where temperature and fluid exposure vary;
PTFE- or POM-backed composites where ultra-low friction and chemical inertness are required.
Material selection is validated with accelerated aging and tribological testing to ensure long-term sealing under mine-environment conditions. Pairing the correct polymer family with appropriate back-up rings and wipers is critical to life and performance.
We combine CAD-driven profile design with Finite Element Analysis (FEA) to optimize cross-sections for dynamic sealing, extrusion resistance and contact pressure distribution. Gland tolerances, radial clearances and backup ring choices are checked against standard selection charts to avoid extrusion and premature wear. This engineered approach ensures reliable performance under high-pressure applications.
Our seals undergo: material aging / hydrolysis tests, dynamic friction and wear bench tests, extrusion resistance checks, and pressure-hold tests to client-specified pressures. Where required, testing protocols are aligned to applicable national and international standards. Providing test reports and material certificates increases uptime predictability for end-users.
Customer problem: A mine operator suffered frequent hydraulic support pressure loss and repeated maintenance shutdowns due to premature seal wear and extrusion on legacy piston seals.
Our solution: Reverse-engineered the existing groove profile, supplied a custom piston seal made from a hydrolysis-resistant polymer with a polyurethane back-up ring, optimized cross-section by FEA, and supplied retrofit kits for fast replacement.
Measured results: After retrofit, the operator reported a marked reduction in leakage events and a significant extension of service interval (for example, maintenance interval increased by more than 50% and total downtime was reduced).
Precision manufacturing (DMH moldless lines) for tight tolerances;
Custom profiles and materials for both standard and legacy groove dimensions (compatible with major international brands);
Engineering support: on-site testing guidance, pressure test procedures and retrofit kits to minimize downtime;
Rapid emergency production and technical response to critical outages.
For engineers: download our Hydraulic Seal Technical Datasheet (material properties, recommended gland dimensions, test reports).
For procurement: request a sample retrofit kit and compatibility checklist for your cylinder model.
Contact our technical team with groove drawings or sample seals for a free compatibility review.
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Customized Services
Our company offers flexible customization for all products. Non metallic roller products can be customized according to the actual needs of buyers, including size, sealing structure, and non-metallic pipe thickness; The suspension method, size, and thickness of the mining cable hook can be customized according to the actual usage needs of the user; Hydraulic seal size, structure, and thickness can be customized
Discuss Customized Content
The Buyer Provides Customized Parameters
We Produce and Send Trial Orders
