- ROLE OF THE SEALS IN HYDRAULIC SERIES:
The cylinders in the hydraulic system convert liquid energy into mechanical energy, creating the force to lift, lower or press the product depending on the needs of the user.
To do this, cylinders need to be completely sealed. However, at the mounting and disconnecting locations where frequent fuel leaks are likely to occur, it is necessary to fully assemble. seal to seal the gap. That's why seal plays a very important role in the hydraulic cylinder system.
Gasket are usually made of rubber; capable of elastic deformation, squeeze into openings, seal and prevent oil leakage. Usually, the standard size of a seal is taken according to the size of the cylinder at each position, so the selection for the seal is quite simple.
However, because seal are made from rubber, so the pressure resistance is less than metal, the temperature also affects a lot gasket, High temperature for a long time will deform seal, can not be sealed. Moreover, during the disassembly process will not avoid scratches due to the stretch, so the selection seal suitable should be durable.
2. TYPES OF SEALS IN HYDRAULIC COILS:
- Piston seal: This is the part responsible for ensuring that the piston shaft is always parallel to the hydraulic cylinder tube.
Most hydraulic cylinders always work with large loads, long travel, possibly inclined jig, which causes the piston shaft and cylinder tube not to be guaranteed parallel during work, causing Large friction force leads to loss of capacity as well as rapid wear of the friction surface.
Piston seal always have to work under extreme conditions, when the oil heats up, it is subjected to expansion, if the oil temperature does not decrease, melting or deformation might happen. seal. Therefore, the quality of piston seal must be given more attention in other locations.
U-Cup is one piston seal single impact. It is provided with a wide contact area, ensuring efficient positioning in the groove. Configurable for pressures up to 40 MPa. Thanks to the elasticity of polyurethane materials, the U-Cup can be easily installed in closed grooves.
Pressure: Up to 40 MPa. Speed: Up to 0.5 m / s
Temperature: -30 ° C to +110 ° C.
Simple groove design
Wear resistance and long service life.
- Cylinder cap seal: This type of seal prevents leakage at the assembly surface between the cylinder tube and the cylinder cap. This seal is only sealed and does not incur friction. Therefore, the working conditions are less extreme than that Piston seal.
This single acting O-Ring provides high static and dynamic sealing results. Turcon Can be installed together with other seals in parallel configuration for enhanced static and dynamic tightness. Provides high extrusion resistance, low friction, no slip, minimal escape force and high resistance to wear.
Pressure: Up to 50 MPa.
Speed: Up to 15 m / s with translational movements, frequency up to 5 Hz
Temperature: -30 ° C to +200 ° C (depending on O-Ring material).
- Dust seal: At the end of each hydraulic cylinder rod, a dust seal is usually arranged to clean the cylinder rod before it is inserted into the cylinder tube.
Scratches in the cylinder tube or on the gear pump surface or on the seal will cause the elements to wear out, not seal and not apply pressure. Therefore, every hydraulic or pneumatic cylinder is equipped with it dust seals to retain external impurities prior to the need to return the piston.
- Dual-use seal: In successful use for decades, the Turcon® Glyd Ring® is a very efficient and reliable low-friction seal. It is particularly suitable for piston seals in both high and low pressure systems.
To ensure fast power supply for seals to take place when pressure changes and direction of movement are abrupt, radial grooves are machined on both sides of the seal for all diameters greater than 20 mm. .
Pressure: Reciprocal up to about 50 MPa.
Speed: Up to about 15 m / s.
Temperature: -200 ° C to +260 ° C (depending on material).
Turcon® Variseal® W2 is a unique performance seal consisting of a U-shaped jacket and a corrosion resistant Slantcoil® spring. The Slantcoil® springs in Variseal® W2 provide a virtually constant load regardless of hardware tolerances, eccentricity and seal wear. At low and zero pressure, metal springs provide primary sealing force. When the system pressure is increased, the main sealing force is achieved by the system pressure and ensures tight tightness from 0 to high pressure. See more here: https://qua247.vn/
For static load: 40 MPa.
For dynamic load: 20 MPa.
Reciprocal: Up to 15 m / s.
Swivel: Up to 1.27 m / s.
Temperature: -70 ° C to +260 ° C.
3. SOME TYPES OF COTTON SEALS:
NBR SEAL / SEAL SEAL NBR:
NBR O-rings, NBR seals or NBR seals are among the most popular seal materials because of their low cost performance in water, oil, fuel and base lubricants. For general purpose applications such as pneumatic, hydraulic and fuel systems, O-rings, gaskets provide cost-effective sealing performance, especially when using hydrogenated versions or other special material compounds. NBR o-rings / seals are not recommended to be exposed to outdoor weather or harsh chemical environments.