RubberRubber seals how rational selection scheme

PU polyurethane rubber seals: polyurethane rubber is very good mechanical function, wear resistance, high pressure capabilities are far superior to other rubbers. Aging resistance, ozone resistance, oil resistance is also quite good, but the high temperature easily hydrolyzed. Typically used for high pressure resistance, wear sealed areas, such as a hydraulic cylinder. Commonly used temperature scale is -45 ~ 90 ?. seals how rational selection scheme

 

1, at room temperature, low pressure, the selection of rubber seals; when the pressure high-temperature, use a combination of metal and non-metal or rubber gasket seals; temperature, pressure greater volatility, the selection of good flexibility or self-tightening rubber seals; at low temperature, corrosive media or vacuum conditions, it should consider sealing gasket with special properties.

 

2, soft seal valve for less demanding situations, empirically selected, when then replace inappropriate.

 

3, for those demanding applications, such as explosive, toxic and combustible gases and highly corrosive liquids equipment, reaction tank and the pipeline system should be based corrosive operating pressure, operating temperature, sealing medium sealing and binding form surface to choose. If the flange gasket, generally need relief, remove the valve cover to replace (As it touches the gasket with pressure repair online, you can view the specific method to process line valve repair manual) 2, if the stem is ring, you need to first open the valve to the fully open position, so much the media can guarantee seal does not leak, then replace the stem rubber ring, soft seal valve pressure is generally in a 1.6MPa.

 

Rubber seals of different materials suitable sealed environment is different, today introduced a rubber ring which allows the seal brake fluid environment for.

 

ACM acrylate rubber ring: The oil has excellent resistance to high temperature, weather resistance are good, but the mechanical strength, compression deformation rate and water resistance somewhat less. Typically used for automobile transmission and power steering systems into system. Does not apply to hot water, brake fluid, phosphate being. Temperature is usually the size of -25 ~ 170 ?.

 

NR natural rubber seals: with excellent wear resistance, elasticity, tensile strength and elongation. But in the air easily aging, when heated, becomes sticky, easily swell and dissolve in mineral oil or gasoline, but not resistant to strong acid and alkali. There are suitable for use in automotive brake fluid hydroxide, ethanol and other ionic liquid. Temperature is usually the size of -20 ~ 100 ?.

 

PU polyurethane rubber seals: polyurethane rubber is very good mechanical function, wear resistance, high pressure capabilities are far superior to other rubbers. Aging resistance, ozone resistance, oil resistance is also quite good, but the high temperature easily hydrolyzed. Typically used for high pressure resistance, wear sealed areas, such as a hydraulic cylinder. Commonly used temperature scale is -45 ~ 90 ?.