An oil seal typically consists of three main components: the Sealing Element (the nitrile rubber part), the Metal Case, and the Spring. It is a widely used sealing component. The function of a seal is to prevent the leakage of medium along moving parts. This is mainly achieved by the sealing element. The TC profile is a shaft seal composed of a single metal cage with a rubber coating, a primary sealing lip with an integrated spring, and an additional anti-pollution sealing lip.
Characteristic
--Very good static sealing:Modern primary sealing lip with low radial forces
--High hardness(-50ºC-120ºC)Â
--Wear-resistant:Greater roughness is allowed in the housing
--Anti-dirty ability:Protection against undesirable air contaminants
--Corrosion-resistant
--Lifetime is more than 450o hours:Very good thermal expansion compensation,Sealing for low and high viscosity fluids
--HRC is 65 to 72
Operating Conditions
-- Life time: 5000-8000hours
-- Specification: 6-13000mm
--Reciprocation Speed: 0-20m/S
--Pressure: 1.0-1.7AR/cm² (max)
--Temperature range: -50ºC-120ºCÂ
-- Hardness: 30-100 Shao A
Common types of oil seals
| Type | Code number | Main features | Usage | Dielectric pressure resistance | Maximum line speed |
| Simple single lipped | B | It is commonly used for high and low speed rotating shafts and reciprocating movement to seal mineral, oil and water. | Ordinary oil seal, in the case of less dust and impurities, the use of medium pressure, the reciprocating speed of <0.1m/s. | <0.05MPa | 15m/s |
| Regular lip | FB | In addition to the characteristics of the above S type oil seals, dust can be prevented. | Ordinary oil seal, with dustproof lips, dustproof, resistant to medium pressure | <0.05MPa | 15m/s |
| No spring type | BV | Spring free single lip type inner frame type rubber oil seal. | Generally applicable to low-speed conditions, the sealing medium for the lubrication of ester. | <0.05MPa | 6m/s |
| Outer skeleton, single lip | W | With the spring single lip exposed skeleton rubber oil seal, waist thin, follow good, good rigidity. | Ordinary oil seal, used in case of less dust and impurities | <0.05MPa | 15m/s |
| Outer skeleton, double lips | FW | With the lips of the lips exposed, skeleton rubber oil seal, waist thin, followed by good, high stiffness, good coaxial. | Ordinary oil seal, with dustproof lips, dustproof, resistant to medium pressure <0.05 | <0.05MPa | 15m/s |
| Fabricated single lipped | Z | From the inside and outside the outer skeleton oil seal skeleton assembly into piping and installation of high precision, fast heat dissipation, heavy load characteristics. | Suitable for heavy load under high temperature and high speed condition | <0.05MPa | 15m/s |
| Fabricated double lipped | FZ | The assembled external skeleton oil seal with side lip has the characteristics of dust resistance, high installation accuracy, fast heat dissipation and heavy load characteristics. | Apply to high temperature, high speed, heavy load under dust condition | ≤0.05MPa | 15m/s |
| Unidirectional reflux type | Dextral SR, | A diagonal bar with angle in lip air measurement system using fluid mechanics principle, produces pump function, with reflux effect. | Because of the backflow effect, the radial force is smaller than that of the ordinary oil seal, thereby reducing wear and heat build-up and improving service life | <0.05MPa | 20m/s |
| Levo DL | |||||
| Pressure type | NY | The lip is short, stubby waist, with pressure, work pressure is less than 3MPa. | The shaft end oil seal for high pressure pump, general PV value is less than or equal to 8 | ≤3MPa | 15m/s |
Rubber Properties
| Rubber Type | Relative Density | Hardness (Shao A) | Mooney viscosity ML1+4,100ºC | Tensile Strength Mpa | Elongation % | Service Temperature RangeºC |
| NR | 0.93 | 20~100 | 45~150 | 6.89~27.56 | 100~700 | -75~90 |
| IR | 0.94 | 20~100 | 55~90 | 6.89~27.56 | 100~750 | -75~90 |
| SBR | 0.94 | 40~100 | 30~70 | 6.89~24.12 | 100~700 | -60~100 |
| BR | 1.93 | 30~100 | 35~55 | 6.89~20.67 | 100~700 | -100~100 |
| CR | 1.23 | 20~90 | 45~120 | 6.89~27.56 | 100~700 | -60~120 |
| IIR | 0.91~0.93 | 20~90 | 45~80 | 6.89~20.67 | 100~700 | -60~150 |
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