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Hydraulic seals and pneumatic seals are designed as per the cylinder working pressure, cylinder speed, operating temperature, working medium and application.
Hydraulic seals are generally relatively soft, non-metallic rings captured in groove or fixed in a combination of rings, forming a seal assembly, to block or separate fluid in reciprocating motion applications. Hydraulic seals are vital in machinery. Their use is critical in providing a way for fluid power to be converted to linear motion. Not only must the hydraulic seals prevent leakage of fluid from the Cylinder, but hydraulic seals must also withstand high pressures, extreme temperatures and transverse forces within the cylinder. In such applications, the function of Hydraulic Seals goes far beyond preventing fluid leakage.
Hydraulic seals can be made from a variety of materials such as polyurethane, rubber or PTFE. The type of material is determined by the specific operating conditions or limits due to fluid type, pressure, fluid chemical compatibility or temperature.
A static hydraulic seal is located in a groove and sees no movement - only sealing within its confined space, acting like gasket.
A type of dynamic hydraulic seal called a rod seal is exposed to movement on its inner diameter along the shaft or rod of a hydraulic cylinder.
A type of dynamic hydraulic seal called a piston seal is exposed to movement on its outer diameter along the tube or bore of a hydraulic cylinder.
NextGen Tech has a complete range of hydraulic seals and we can also assist you in creating custom-made seals for linear and static hydraulic applications.
Seal Functions
Each dynamic seal in a hydraulic cylinder has a special function to contribute to the performance of the system.
Piston Seal Functions
Acts as a pressure barrier and prevents fluid passing the piston; important for controlling the cylinder motion or maintaining the position at rest
Rod Seal Functions
Act as a pressure barrier and keeps the operating fluid inside the cylinder
Regulates a film of fluid on the surface of the piston rod as it extends; important to inhibit rod corrosion and lubricate the wiper and rod seal itself
Accept the lubrication film back into the cylinder when the rod retracts
Buffer Seal Functions
Protect the rod seal from fluid pressure spikes in excess of system pressure
Attenuate the fluctuations in system pressure, thereby improving rod seal performance by allowing the rod seal to deal with more constant or gradually changing pressure
Act as an internal excluder to keep system contaminants, such as metal particles from damaging the rod seal
Wiper Seal Functions
Prevent external contaminants from entering the cylinder assembly and hydraulic system (pump, reservoir etc)
Accept the lubrication film back into the cylinder when the rod retracts
Guide Rings (rod and piston) Functions
Prevent metal to metal contact between components
React to radial loads caused by side loads on the cylinder assembly
The Roto GSF is used to seal rods, shafts, axles, bores, rotary transmission lead throughs, journals, swivels etc. with rotary or oscillating movement.The seal is double-acting and can be exposed to pressure from one, or from both sides.
Composed of a filled PTFE friction ring and an O'Ring, which guarantees pre-tightening, the "roto-seals" allow a reliable and durable radial sealing. These radial seals have a very low friction coefficient, which ensures long-term optimal sealing.
Furthermore, the "roto-seals" that are resistant to very high pressures (approximately 30 MPa), can withstand sharp increases in temperature, and are completely protected from the stick-slip" effect.
Advantages
• Good sealing performance in extremely small assembly conditions.
• Excellent wear resistance.
• Minimal break-away and dynamic friction and no stick-slip tendency ensures uniform motion even at low speeds.
• Good energy efficiency due to low friction.
• Insensitive to pressure peaks.
• High temperature resistance assured by suitable O-Ring compound selection.
• Improved lubrication due to pressure medium deposit in the dynamic contact area.
• High extrusion resistance.
• Adaptable to nearly all media thanks to high chemical resistance of the sealing ring and large O-Ring compound selection.
• Short axial assembly length.
• Installation in closed and undercut housings.
• Further dimensions of machined series with short lead times available.
Installation Instruction
The following points should be observed before installation of the seals:
Check whether housing or rod has a lead-in chamfer; if not, use an installation sleeve
Deburr and chamfer or round sharp edges, cover the tips of any screw threads
Remove machining residues such as chips, dirt and other foreign particles and carefully clean all parts
The seals can be installed more easily if they are greased or oiled. Attention must be paid to the compatibility of the seal materials with these lubricants.
Use only grease without solid additives (e.g. molybdenum disulphide or zinc sulphide)
Do not use installation tools with sharp edges
NextGenTech OE roto glyd seals are single or double acting rod rotary seals composed of a filled PTFE grooved friction ring and a pre-tightened rubber O-ring. It is applicable for sealing the piston of hydraulic cylinder, which is two-way sealing. It is generally used together with guide rings.
| Technical data | ||||
| Temperature | -40°C / +200°C | |||
| Pressure | Up to 30MPa | |||
| Speed | Up to 2m/s | |||
| Medias | Mineral hydraulic oils Fire-resistant liquids Biocompatible fluids Water | |||
| Material | Friction ring Bronze-filled PTFE Carbon-filled PTFE Virgin PTFE O-ring NBR 70 Shore A FKM 70 Shore A | |||
| Applications | Rotary distributors Handlers Hydraulic motors rotary joints | |||
| Advantages | Low friction coefficient; no stick-slip effect on startup Excellent abrasion and extrusion resistance The grooves provide an integrated lubrication system Excellent dimensional stability | |||
1.Our price:
Our price is not the lowest one, but compared with the same quality level product,ours is the best one.
2. How can we guarantee quality?
Always a pre-production sample before mass production;
Always final Inspection before shipment;
3.What can you buy from us?
Kind: Oil Seals,O-ring, Rod/Piston seal, Gas seal, Guide elements, Large sized Seals Customized Seals.
Material: NBR/EPDM/FKM/Silicone/HNBR/PU
4. Shipping:
Quickly delivery, with several delivery ways, such as DHL/FEDEX/UPS/TNT express, Air and Ocean shipping way. We have several express accounts and can help you save cost.
5, About customized Service:
Drawings or samples, it is enough. We can produce colored rubber seal just based on your drawing or samples with kinds of colors. We also can give the professional advice based on your requirement.
