Professional O-Ring and Oil Seal Manufacturer, Sealing Solution Supplier Since 2008.
Glyd Ring – Premium Double-Acting PTFE Composite Piston Seal for Hydraulic Cylinders
2026-06-05
1. Industry Trend and Defects of Conventional Piston Seals
1.1 Upgrading trend of modern hydraulic systems
Modern hydraulic equipment ranging from construction machinery to precision automated production equipment keeps evolving towards high working pressure, high-frequency reciprocating movement and compact overall structure. Equipment manufacturers continuously raise stricter requirements on sealing stability and service lifespan to control post-production maintenance cost and secure consistent machining precision in daily operation.
1.2 Existing drawbacks of all-rubber piston seals
Traditional integral rubber piston seals can only achieve unidirectional sealing effect and fail to prevent bidirectional medium leakage inside piston cavities. Common rubber materials will suffer swelling, hardening and permanent deformation after long-time soaking in various hydraulic oil and high-temperature lubricants, and high system pressure above 25MPa easily squeezes rubber edges into assembly gaps to trigger abrupt seal failure and unexpected machine shutdown.
2. Market Positioning and Design Idea of Glyd Ring
Developed as a mature bidirectional composite sealing product specially for piston grooves, the glyd ring organically combines the rigid wear-resistant property of modified PTFE and the flexible elastic compensation performance of rubber O-rings. It is designed to target the core drawbacks of traditional rubber seals and has gradually become the preferred matching accessory for medium and high-pressure hydraulic cylinders in global industrial markets, balancing practical performance and procurement cost for different application scenarios.
3. Complete Structural Composition of Standard Glyd Ring
The finished glyd ring is assembled by two independent functional parts with clear work division. The outer part is rectangular filled PTFE sliding ring processed via carbon or glass fiber modification, undertaking direct contact sealing with cylinder inner wall; the inner embedded component is elastic rubber O-ring responsible for persistent preloading and abrasion gap compensation. The special rectangular outline of PTFE enables synchronous fitting on two sides of piston groove, laying the foundation for bidirectional sealing performance of the whole product.
4. Core Working Principle of Sealing and Self-compensation
4.1 Bidirectional sealing implementation principle
Under the lasting radial elastic thrust from inner O-ring, the outer PTFE ring closely adheres to cylinder bore surface and isolates hydraulic medium on both sides of piston cavity to avoid internal cross leakage inside hydraulic cylinders.
4.2 Automatic abrasion compensation mechanism
Long-term reciprocating friction will produce tiny abrasion on PTFE sealing surface, and the compressed O-ring expands outward automatically to push PTFE outward and fill the generated clearance, maintaining stable sealing effect throughout long service cycles. Meanwhile, rigid PTFE structure effectively blocks high-pressure medium from squeezing the seal into assembly gaps to realize outstanding anti-extrusion capacity.
5. Diversified Material Matching and Corresponding Performance Parameters
Different collocation of PTFE filler and rubber O-ring can adapt to diversified temperature and medium environments. The combination of carbon-filled PTFE and NBR O-ring fits ordinary mineral hydraulic oil within -35℃~120℃ with superior cost performance, while glass-filled PTFE matched with FKM O-ring can resist synthetic oil and high-temperature grease, stably working under -20℃~180℃. Pure PTFE plus VMQ silicone O-ring is customized for food-grade and low-friction working conditions. Standard glyd ring can bear rated working pressure up to 40MPa, and customized reinforced formula products can reach over 55MPa maximum working pressure.
6. Wide Application Range Across Multiple Industrial Fields
Glyd rings are widely configured on piston positions of hydraulic cylinders in numerous industries. They serve conventional construction machinery, forklifts and port handling equipment as mainstream standard accessories, and are also extensively matched with precision injection molding machines, metallurgical forging hydraulic presses and heavy-duty vehicle shock absorber hydraulic assemblies to satisfy the high-precision and high-pressure sealing demand of different types of hydraulic equipment. Our warehouse stores abundant standard sizes complying with ISO and GB standards, non-standard products can be customized according to customer’s groove drawings.
7. Standard Installation Specifications and Key Precautions
Before formal installation, operators need to thoroughly clean piston grooves to clear burrs, metal scraps and residual fragments of old seals for preventing unexpected scratch damage on PTFE sliding ring. Moderate compatible lubricating grease shall be evenly coated on the surface of the whole seal to reduce assembly friction. Sharp tools such as screwdrivers are forbidden to pry the seal forcibly into the groove, and final inspection is required after installation to confirm free expansion and contraction of PTFE inside the groove without clamping stagnation.
8. Factory Supporting Service and Product Quality Control
FOREVER SEALS provides full-chain customized services covering structural design, material formulation development, mold opening production and finished product precision testing for all non-standard size glyd rings. All finished products must pass strict factory inspection including pressure resistance test, medium immersion test and reciprocating wear test before delivery.
Whatsapp: +86-13726338110；WeChat: 13620158686；E-mail: nbr@foreverseals.com
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