Seal selection, working conditions must be considered to select the appropriate form of seals and materials, the installation structure.

Need to consider the general working conditions include: temperature, pressure, media. Other devices also require a combination of features to consider their own selection.

On the temperature, operating temperature range of materials such as NBR is generally -40 ~ +120 ¡æ. It used to be considered beyond the FKM 120 ¡æ, and even a PTFE material. Low temperatures is relatively rare, in general, at -20 ~ -40 ¡æ to consider the case of cold NBR, NBR materials in general will result in the low temperature material hardens, leading to leakage, such as winter in the northern railway often occurs on such issues.

As for the pressure, the impact of seals to be used in the form. In general, use of low pressure in the pressure sealing rubber or PU will not be a big problem. However, to consider a shock pressure, such as construction machinery, off, when its impact is much larger than the normal working pressure of the pressure, so the pressure will often use up to 70MPA the impact resistance to collapse or SPGW to do the main gap HBY seal. PTFE seals is also commonly used in a combination of options.

The problem is relatively simple media. Just need some special attention to small problems, such as fuel tanks of the metallurgical industry often use water - ethylene glycol and phosphate ester hydraulic oil. Although sometimes working temperature is not high, but still have to be very careful choice of materials, hydraulic oil when the latter still have to use FKM.

Selection of seals is very important, or the situation must be combined to select the device itself. For example, the need for responsive, precise control of course, choose Lancaster closure kale circle. Require high reliability, often will choose Hong Geer's GD1000K series or NOK of SPGW. Another example is the work of construction machinery field work when the cold weather impact and often, it's dust ring will be used so as not to cause exposed metal skeleton off.

Cylinder, piston ring compressors, high pressure oil seals, and a variety of scientific instruments in the pump seal needs of their special structure to meet the requirements.

All these different terms, and I welcome the exchange of the selection of seals