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Dongguan Minz Rubber & Plastics Co., Ltd.

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Correct selection of seals and gaskets is the key to ensure no leakage of mechanical equipment.

Release time:

2019-07-05 12:30

Source:

Correct selection of seals and gaskets is the key to ensure no leakage of mechanical equipment.
 
Selection of gasket seal application 1. Precautions for selectionSeal GasketIt is the key to ensure no leakage of mechanical equipment.
For the same working condition, there are generally many kinds of seals and gaskets without materials to choose from. However, when we choose seals and gaskets, we choose seals and gaskets reasonably according to the physical properties of the medium, pressure, temperature, size of mechanical equipment, operating conditions, and length of continuous operation cycle. The characteristics of various seal gaskets.
 
SelectSeal GasketThe following factors shall be fully considered:
(1) has good elasticity and recovery, can adapt to pressure changes and temperature changes;
(2) has the appropriate softness, can be well fitted with the contact surface;
(3) Do not pollute the process medium;
(4) It has sufficient toughness and does not cause the gasket seal to break the ring due to pressure and tightening force;
(5) It does not harden at low temperature, and the shrinkage is small;
(6) Good processing performance, simple installation and convenient pressing;
(7) do not bond the sealing surface, easy to disassemble;
(8) Cheap and long service life. In the use of gasket seals, pressure and temperature are mutually restricted. As the temperature increases, after the mechanical equipment works for a period of time, the gasket seal material, creep, stress, and mechanical strength will also occur. Decrease, the sealing pressure is reduced. And vice versa.
For example, the manual lists high-pressure asbestos rubber sheet XB450 in water and steam medium, with a temperature of 450 ℃ and a pressure of <6MPa (when the material is tested for sealing performance, it is kept in steam of 440 ℃ ~ 450 ℃ and 12MPa for 30 minutes). But in the long-term actual use, if the temperature reaches 450 ℃, the sealing pressure is only 0.3~0.4MPa. For strong gas medium, it is only 0.1~0.2MPa. Therefore, in the selection of gasket seals, the above situation should be fully considered.
 
How to correctly choose gasket sealing ring should pay attention to several problems?
 
A few steps to teach you how to choose a gasket seal ring several problems to pay attention:
(1) Not subject to fluid.
(2) the chemical resistance of the fluid, without destroying its own physical properties.
(3) Under normal flange pressure, there can be sufficient deformation to make up for the roughness or depression of the flange surface, so that a seal is formed between the flange surface and the gasket.
(4) in the fluid temperature range does not destroy the physical.
(5) The elasticity or recovery is sufficient to maintain the flange load.
(6) The strength is sufficient, it will not be damaged during installation or cutting, it will not break under flange load, and it will not break under fluid pressure.
(7) Do not contaminate the fluid.
(8) Do not erode the flange surface.
(9) Easy to replace.

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