Professional O-Ring and Oil Seal Manufacturer, Sealing Solution Supplier Since 2008.
SPGW Combined Piston Seal — Core Matching Part for Heavy-duty Hydraulic Cylinders
2026-06-08
1.Upgrading Trend of Hydraulic Sealing Technology and Drawbacks of Traditional Seals
1.1 Performance requirements for seals in modern hydraulic industry
Modern construction machinery, mining equipment and industrial hydraulic systems are developing towards high pressure, high frequency operation and long service life. Higher standards are put forward for the sealing stability, wear resistance and low friction of piston seals to reduce equipment failure and maintenance frequency.
1.2 Deficiencies of conventional single-structure piston seals
Traditional rubber or single-layer sealing rings are easy to be squeezed and deformed under long-term high pressure. They suffer from poor wear resistance, obvious crawling phenomenon during operation and frequent oil leakage, which cannot meet the working demands of heavy-load hydraulic cylinders.
2.Product Positioning and Core Design Concept of SPGW Seal
SPGW is a widely used combined piston seal specially designed for hydraulic cylinder pistons. It adopts composite structure combining anti-wear sliding material and elastic rubber body. The product focuses on realizing bidirectional sealing, low friction and strong anti-extrusion capacity. It has become a mainstream matching seal for engineering machinery, metallurgical equipment and various heavy-duty hydraulic facilities at home and abroad.
3.Material Composition, Structural Features and Working Principle
3.1 Main material collocation and applicable working conditions
SPGW seal is mainly composed of filled PTFE sliding ring and elastic rubber energizer. With excellent self-lubricating property, the PTFE part effectively lowers friction. The rubber body provides lasting elastic preload. Standard products adapt to working temperature from -35℃ to 160℃, and can operate stably in mediums such as hydraulic oil, emulsion and water-based fluid.
3.2 Structural design and sealing principle
The integrated composite structure is simple for installation. Relying on the elastic force of the internal rubber part, the outer sliding ring closely fits the cylinder wall to form reliable bidirectional sealing. The overall structure can effectively disperse high pressure and prevent seal extrusion damage.
4.Product Performance Advantages and Practical Application Scenarios
4.1 Core performance strengths
This combined seal features outstanding wear resistance, small starting friction and no crawling during reciprocating movement. It maintains stable sealing effect under high pressure, with long service life and strong adaptability to complex working conditions. Meanwhile, it is easy to assemble and disassemble without special tools.
4.2 Main application fields
SPGW combined seals are largely applied to piston parts of hydraulic cylinders for excavators, loaders, forklifts, metallurgical presses and agricultural machinery. Our factory supplies full specifications complying with industry standards, and supports customized production according to customer’s size drawings and working condition requirements.
5.Standard Installation Specifications and Daily Use Notes
Clean the piston groove thoroughly before installation to remove burrs, oil dirt and residual sundries. Do not apply excessive force or distort the seal during assembly to avoid permanent deformation. After installation, check that the seal is fully embedded in the groove to ensure normal reciprocating operation of the piston.
6.Product Selection Guide and Scientific Storage Requirements
Select corresponding material formulas according to actual working pressure, temperature range and hydraulic medium of the equipment. Finished products should be stored in a dry and cool environment, kept away from high temperature, sharp objects and corrosive substances, to prevent aging and deformation of rubber parts.
7.Manufacturer Service Support and Factory Quality Inspection Standards
7.1 One-stop customized service
We provide professional services including material selection, size optimization, mold opening and mass production for all non-standard SPGW combined seals to meet personalized matching demands of different equipment.
7.2 Strict quality inspection procedures
All finished products will pass pressure resistance test, abrasion test and sealing performance test before delivery, so as to guarantee stable and reliable field use.
Whatsapp: +86-13726338110；WeChat: 13620158686；E-mail: nbr@foreverseals.com
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