In the sealing industry, the question often comes up: why not just use a simple O-ring? It’s cheap, easy to find, and works in many places. But once you deal with hydraulic cylinders under high pressure, gearboxes running at variable speeds, or excavators working in mud and dust, you quickly realize that a single seal has its limits. This is where the Combination Seal Series proves its value.
Why Combination Seals?
Think of it as teamwork. One part of the seal provides elasticity, another reduces friction, another resists extrusion, and together they achieve something no single component could do. The most common setups include:
· Piston seals – polyurethane lips with backup rings for heavy-duty hydraulic cylinders.
· Rod seals – PTFE sliding rings energized by O-rings, used in fast-moving equipment.
· Dust/wiper combos – dual lips to keep out dirt and water.
· Hybrid seals – effective both when the system is running and when it is idle.
Materials are equally diverse: NBR, FKM, PU, PTFE, reinforced nylon. Thanks to this mix, these seals can handle pressures of 40 MPa and above, resist wear, and perform in oils, water-based fluids, and different temperatures.
Application Examples
For distributors wondering about the market, here are some clear applications:
· Hydraulics and pump/valve systems – for stable pressure and reduced leakage.
· Construction machinery – excavators, loaders, cranes working in dirt and shock loads.
· Wind power and energy equipment – coping with long service intervals and big temperature swings.
· Industrial robots and arms – fast movement but very little tolerance for leakage.
· Automotive systems – transmissions, steering systems where oil resistance matters.
In short, if it involves high pressure, repeated movement, or harsh
environments, combination seals are likely part of the answer.
DEDE is Service Advantages
Products are one thing, but service is what builds trust in markets. With DEDE, customers benefit from:
· Ready stock – thousands of standard O-rings, oil seals, and combination seals available for same-day shipment.
· Custom solutions – from design and material choice to testing, we build seals to match special operating needs.
· Technical support – over 30 years of project experience means advice that helps cut downtime and extend service life.
This translates to peace of mind for distributors and wholesalers: standard parts are always there, and unusual requirements won’t leave you stuck.
Why do partners choose DEDE? The reasons are clear:
· Own factory, not just a trading office.
· Wide product range, with most models in stock.
· Exporting to 80+ countries, serving multiple industries.
· Certified as a Provincial Technology Innovation Center, Specialized and New Enterprise, High-Tech Enterprise.
· Trusted supplier to several internationally known brands.
For partners, that means credibility, stability, and the ability to build long-term cooperation.
FAQ
Q1: Aren’t these seals more expensive than O-rings?
A1: Yes, per piece they cost more. But since they last longer and reduce downtime, the overall cost is often lower.
Q2: Do you really keep stock?
A2: Yes, for all common sizes. For custom designs, production lead times are kept short.
Q3: Who benefits most?
A3: Distributors dealing with hydraulic repair, construction equipment, energy equipment, or automotive components.
Q4: Will you support technical selection?
A4: Of course. Our team helps evaluate operating conditions and recommend the best material and structure.
The Combination Seal Series is not just another catalog item. It is a
system-level solution for the complex challenges faced in modern machinery. By
combining materials and structures, these seals deliver stability where single
components cannot. For distributors, wholesalers, and OEM, DEDE provides not
only the product itself but also the manufacturing strength, stock availability,
and technical partnership to stay competitive.
