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Classification knowledge of hydraulic combined seals

January 16, 2022

 

    From a professional point of view, seals can be divided into two categories: static seals and dynamic seals. Static seals mainly include pad seals, sealant seals and direct contact seals.

 

     According to the working pressure, static seals can be divided into medium and low pressure static seals and high pressure static seals. The medium and low pressure static seal is sealed with a softer material and a wider width, and the high pressure static seal is made of a hard metal gasket with a narrow contact width.

 

     Dynamic seals are divided into two basic types: rotary seals and reciprocating seals. According to whether the seal is in contact with the parts that move relative to it, it can be divided into contact seals and non-contact seals.

 

 

Hydraulic combined seals: Combined seals Commonly used combined seals for hydraulic cylinders are Bud ring, Gley ring and step seal.

 

 

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Combination seal bud ring:

 

   The bud ring is usually composed of a synthetic rubber O-shaped sealing ring and a cloth rubber Y-shaped sealing ring. Like the type seal, its deformation produces a high initial contact stress on the sealing surface, preventing the leakage of the non-pressure liquid.

 

    When the hydraulic cylinder is working, the pressure liquid always squeezes and spreads the sealing lip of the shape sealing ring through the elastic deformation of the sealing ring, making it close to the sealing surface to generate a higher additional contact with the increase of the pressure of the pressure liquid. stress, and together with the initial contact stress, prevent the leakage of the pressurized liquid;

 

Combination Seals Glyph Rings:

 

   The Gree ring is composed of the superimposed use of a shaped rubber sealing ring and a square seal filled with PTFE. The Gree ring can be divided into a Gree ring for holes and a Gree ring for shafts. Their sealing mechanism In the same way, its deformation produces a higher initial contact stress on the sealing surface, preventing the leakage of unpressurized liquid.

 

   When the hydraulic cylinder is working, the pressure oil makes the elastic deformation of the 0-shaped sealing ring squeeze the square sealing ring, making it close to the surface of the sealing ring, and together with the initial contact stress to prevent the leakage of the pressure oil;

 

Combination seal step seal:

 

   Its structure is similar to that of the Gley ring, and it is also composed of a O Ring rubber sealing ring and a special shape rectangular or trapezoidal sealing ring filled with PTFE. There are two types of shafts. The sealing function and sealing mechanism of the special seal are the same as those of the Gree ring, but the special seal only has a one-way sealing effect. The common point of step seal and gleaming ring is that it is filled with teflon material, which has low friction, no crawling, and long life.