Introduction
Fundamental parts of hydraulic and pneumatic systems are piston seals. Mainly, they serve to keep the cylinder and piston sealed. Unsealed oil leaks. On the hole is opened the sealing groove. Avoid both the working material leaking and the system becoming contaminated.Different hydraulic equipment depends heavily on piston seals. They guarantee the system’s efficient running and best possible performance.
Piston seals performance and applications
What piston seals do
Sealing function stop liquid under high pressure from seeping from one piston side to the other.
The dustproof feature keeps dirt and other impurities out of the cylinder.
Categories of piston seals
One direction sealing is provided by single-acting seals.
Seals with two active directions: seal in both directions.
Combining many sealing components gives a more dependable sealing effect in combined seals.
Products used in piston seals
Good wear resistance and media compatibility characterize polyurethane (PU).
Excellent non-stick and chemical resistance characterize polytetrafluoroethylene (PTFE).
Both wear and grease resistance are strong points of nitrile rubber (NBR).
High mechanical strength polyamide (PA) is appropriate under high pressure situations.
Specifications of piston seal design
High pressure extrusion is prevented by anti-extrusion retaining rings.
Accurate surface roughness guarantees suitable contact between cylinder barrels and seals.
Piston seal applications
tractor, harvester, and other agricultural machines.
Construction equipment includes cranes, excavators, and so on.
Industry machinery: hydraulic presses, for example.
Application in automotive and marine industries: utilized in ship and car hydraulic systems.
Piston seal selection key points
Select seals with matching pressure resistance based on system pressure during working pressure.
Working temperature take into account the range of temperature resistance of the seal material.
Compatibility of the seal material with the working media should be checked.
Selection of the suitable seal should be based on the piston rod’s movement speed.
Piston seal installation and care
Oil and dust should not be present on the installation surface.
Install correctly to prevent seal damage: follow the manufacturer’s directions.
Regular inspection: timing the replacement of the seal by routinely checking its wear.
Cylinder seal failure analysis
Extrusion damage is the result of high pressure pressed seals leaking.
Long-term movement may wear down seals.
Chemical attack: The seal material may deteriorate in incompatible media.
Engine seal development trends
Improvement of sealing materials: creation of more effective materials.
Use recyclable and ecologically acceptable materials.
For intelligent monitoring of the sealing state, include sensor technologies.
The distinctions between a piston rod seal and a piston seal
Piston rod seal is the seal between piston rod and cylinder head; piston seal is the seal between cylinder body and piston.
Different impact effects: Oil leaks from a poorly sealed piston rod seal, and poor sealing of the piston seal will impair the oil cylinder’s performance.
The piston seal’s sealing groove is opened on the piston, while the piston rod seal’s sealing groove is opened on the hole, for different reasons.
The sealing rings of the piston rod seal and the piston seal are different; the shaft sealing ring is utilized on the piston seal.
Comprising the hydraulic cylinder are the cylinder body, piston, piston rod, cylinder head, and sealing ring.
The single-rod and double-rod types of piston hydraulic cylinders are the two types of constructions. Both piston rod and cylinder body fixing are available. Single-acting and double-acting kinds are distinguished by the way the hydraulic pressure acts.
While the piston of a double-acting hydraulic cylinder can move in two directions, the pressurized oil supply to the two chambers and the action of hydraulic pressure allow the cylinder to move in one direction only in a single-acting hydraulic cylinder. Movement in the opposite direction is accomplished by external force (such as spring force, deadweight or external load, etc.).
Conclusion
The proper piston seals must be chosen by being aware of the particular needs of the application. Reliability and effectiveness of performance depend on factors like fluid compatibility, operational environment, and motion type (rotary or linear).
