From massive excavators to deep-sea oil rigs, JSPSEAL hydraulic seals keep critical machinery operating under the most demanding conditions across construction, mining, industrial, and energy sectors.
Every seal we manufacture is engineered for the real-world demands of these critical sectors — extreme pressure, harsh chemicals, and non-stop operation.
Cylinder seals for excavators, loaders, bulldozers, and backhoes from CAT, Komatsu, Volvo, and more.
Longwall support seals, hydraulic prop seals, and drilling equipment sealing for underground and surface operations.
Hydraulic press seals, pneumatic cylinders, and automation machinery across automotive, textile, and metallurgy.
High-pressure seals for pipelines, refining equipment, subsea valves, and wellhead systems rated to 70 MPa+.
Hydraulic cylinders are the power heart of every construction machine — from loader booms to bucket cylinders. Our seals convert hydraulic energy into precise mechanical motion, ensuring efficient control under extreme loads.
Every construction cylinder relies on a carefully engineered seal system. Each component serves a specific purpose — from preventing external contamination to isolating hydraulic chambers for precise pressure control.
Installed outside the end cover to prevent external dust, mud, and moisture from entering the cylinder. Available in snap-in and press-in types, typically made from polyurethane with metal case or NBR.
The primary piston rod seal (U-cup) installed inside the end cover to prevent hydraulic oil leakage. Made from polyurethane or NBR, often paired with a backup ring under high pressure.
Auxiliary piston rod seals that protect against sudden pressure spikes, preventing seal extrusion and enabling the system to withstand higher operational pressures.
Support the piston rod and guide linear motion while preventing damaging metal-to-metal contact. Materials include nylon, phenolic resin cotton, and PTFE bronze.
Isolate the two hydraulic chambers and serve as the primary seal. Typically a two-piece design with an outer ring of PTFE or nylon and an inner ring of NBR rubber.
In longwall mining and underground operations, hydraulic support seals are critical safety components. They prevent oil leakage under extreme pressure, block moisture and coal dust, and enable 100% automated operation of support systems.
Mining hydraulic support systems use specialized seals designed to withstand the unique combination of high pressure, coal dust contamination, and moisture found underground.
Prevent coal dust and contaminants from entering the hydraulic system, protecting internal components from abrasive contamination.
Seal the hydraulic prop piston rod to prevent oil leakage under the extreme pressures of roof support operations.
Multi-material design: low-friction outer ring, elastic inner ring, and high-strength retaining ring form a self-compensating sealing structure.
Self-compensating seal gap design for long-term reliable performance in mining prop applications without frequent replacement.
Beyond construction and mining, seals are essential across virtually every industrial sector — preventing fluid and gas leakage, protecting internal components, and ensuring the safe and efficient operation of equipment in automotive, aerospace, petrochemical, metallurgy, textile, and power industries.
Our industrial sealing solutions serve a broad range of sectors, each with unique performance requirements.
Oil and gas sealing technology covers the entire chain — from wellhead extraction and pipeline transport to refining and subsea equipment. These seals must withstand extreme temperatures, high pressures up to 70 MPa, and aggressive chemical media including H₂S, CO₂, and drilling fluids.
The oil and gas sector requires seals that perform in the most aggressive environments on Earth — from Arctic drilling to deep-sea wellheads. Materials must resist aromatic hydrocarbons, acid gases, and extreme thermal cycling.
Seals for wellhead equipment, Christmas trees, pipeline valves, and pumps ensuring leak-free operation across the entire production chain.
Ethylene crackers, polyolefin reactors, compressors, agitators, and critical rotating equipment in petrochemical facilities.
Advanced sealing for core dynamic equipment including ethylene compressors, reactor circulation pumps, and high-speed liquid ammonia pumps.
Ball valves, gate valves, throttle valves, and multiphase flow meters rated to API standards for deepwater applications.
Tell us your application requirements — equipment model, cylinder specs, or operating conditions — and we'll recommend the optimal sealing solution.