Sealing pieces of the choice of working conditions need to be considered?

Need to consider the working conditions generally include: temperature, pressure, and media. Others require a combination of the characteristics of the device itself to consider the selection.

Temperature, such as NBR, TPU material Operating temperature range is generally in the -40 to +120 ℃. That exceed 120 ° C is necessary to consider using the FKM, even PTFE materials. Low temperatures is relatively rare,

In general, in the case of -20 to -40 ° C to consider the use of cold-resistant of NBR, NBR materials at low temperatures will cause the material to harden, resulting in leakage, such as railway locomotives in the northern winter is often such a problem , so the best choice for TPU polyurethane materials.

As for the pressure, the impact to be optional in the form of seals. In general, low-voltage, medium voltage selection of rubber or TPU seals will not be a big problem.

But to consider the problem of a shock pressure, such as the start of construction machinery, shut down when the shock pressure is much larger than the normal working pressure,

Often selected pressure up to 70Mpa the impact of anti squeeze gap HBY or SPGW,, main seal. PTFE combined seal is also commonly a choice.

The media is relatively simple. Only need to pay attention to some special problems, such as metallurgical industry, the fuel tank is often used water - ethylene glycol and phosphate ester hydraulic oil.

Sometimes the operating temperature is not high, but the choice of materials to be very careful, hydraulic oil using the latter still have to choose of FKM.

The selection is very important to seal that must be combined with the device itself to choose. For example, the need for responsive, precise control of the course, Lancaster letters Grameen circle.

Require high reliability, for example, field work, engineering machinery work often has an impact and cold weather, so as not to lead off its dust ring will be the selection of exposed metal skeleton.

Their seals of the pump cylinder, piston ring compressor, high pressure oil seal, and a variety of scientific instruments require special structures to meet the requirements.