The function of O-ring seal

The O-ring is an extrusion seal. The basic working principle of the extrusion seal is to rely on the elastic deformation of the seal to cause contact pressure on the sealing contact surface. If the contact pressure is greater than the internal pressure of the sealed medium, there will be no leakage, otherwise leakage occurs. The process in which the medium itself changes the contact state of the O-ring to achieve sealing is called "self-sealing effect".

Due to the pre-sealing effect, the O-ring is in close contact with the smooth surface to be sealed and the bottom surface of the groove. In this way, when the fluid enters the groove through the gap, it can only act on one side of the O-ring. When the fluid pressure is high, the O-ring is pushed to the other side of the groove and squeezed into a D shape, and the pressure is transmitted to the contact surface. The self-sealing ability of the O-ring is limited. When the internal pressure is too high, the rubber material of the O-ring will be extruded. That is, because there is a gap in the sealing part, the O-ring under high pressure will produce stress concentration in the gap. When the stress reaches the point where the rubber of the O-ring cannot bear it, the rubber will be squeezed out. At this time, although the O-ring The seal can be maintained temporarily, but it is actually damaged. Therefore, strict selection is required.

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ShijiazhuangPansto Pump Industry is a manufacturer of slurry pumps in Shijiazhuang. It mainly designs, manufactures and sells slurry pumps and accessories. Mainly engaged in mud pumps, submersible pumps, foam pumps, desulfurization pumps and many other series.

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