First, what is waterproof star shaped ring?
The star circle is the most commonly used in the hydraulic cylinder seal, it is a kind of typical lip seal, both for piston or piston rod can achieve good sealing effect, U ring under the condition of low voltage, only by interference lip deformation of seal, because of the small contact area, the friction force relatively low, with the increase of pressure, the lip elastic deformation increased, tensile, compression and bending stress increase, U ring radial pressing force automatically becomes large, and the sealing surface contact length increases, the axial length of the U ring until contact with the seal surface, so as to ensure a good seal for high pressure state.
The star seal ring is a double acting seal with an elastic sealing capability. A radial or axial contact stress is generated by pre compression of the initial installation, and the system pressure is superposed to realize sealing function.
The sealing force increases with the increase of system pressure. Under pressure, the star shaped ring is like a fluid with a high surface tension. The pressure can be uniformly transmitted to each surface.
Star seals are widely used, but they are mainly used in dynamic seals, but their use is limited by pressure and speed.
Two, waterproof star ring sealing classification:
Application of 1. dynamic seals:
A piston, a piston rod, and a plunger for sealing reciprocating motion.
A shaft or spindle used to seal, swing, rotate, or twist. ,
2. application of static seal:
A sealed, radially stationary part, such as a sleeve, end cap, or tube.
An axially sealed part, such as a flange, a cover plate, etc..
Working parameter:
Dynamic seal:
Reciprocating motion: no less than 5Mpa ring: less than 30Mpa using ring file.
Rotary motion: less than 5Mpa using ring file.
Static seal ring: no less than 5MPa: = 40Mpa use ring.
Work speed:
Reciprocating motion: less than 0.5m/s.
Rotary motion: less than 2m/s.
Range of temperature: (depending on the material and medium).
Commonly used: -30 DEG C to 110 DEG C.
Special material: -30 ~ 200 DEG C.
Rotational motion: -30 DEG C to 80 DEG C.
Medium: the sealing of all liquids, gases, and chemicals at a time by selecting materials of different characteristics.
Three, waterproof star ring line specifications
Line diameter 0.3mm - 16.2 mm; inner diameter 1.45MM - 1044mm; Complete: C/S, 0.3mm - 16.2, mm; ID1.45mm - 1044mm;
hardness
40 ~ 90 DEG rubber products;
Star gasket
The star ring can be used instead of the O ring completely, and the non-circular cross section can avoid rolling in the reciprocating motion. It has been improved and improved on the basis of the performance of the O ring, and its standard size is the same as that of the O AS568 ring in the United States