How to Select O-ring O-ring hydraulic

Hydraulic pressing the O-ring is applied to the deformation as a percentage of the cross-sectional thickness of the seal in a free state ratio of the amount. Hydraulic cross section deformation of O-ring "power" of the elastomeric matrix like compression spring; the inherent elasticity of the rubber material so that it is pushed back against the mating component. This contact force block of liquids, gases and dry powder to prevent them from between the rubber seal and the hardware of the flow channel.

Hydraulic squeeze the O-ring is larger, a greater force is applied to the hardware and tighter seal. But that does not necessarily mean that designers should always specify the most crowded (assuming they know what that level is why, this is the "most"). There are many factors to consider, if the increase in extrusion, and compression strength, too much can potentially damage the mating hardware, depending on the material and hardware design.

Hydraulic O-ring friction and wear, has a higher extrusion is also equipped with more friction and dynamic applications faster wear. This may be enough to affect the functions of the device. For example, in medical apparatus ?? manual adjustment, and an O-ring, which produces excessive friction may prevent physicians from the proper use of the device.

Hydraulic damaged O-ring to squeeze higher to a higher risk that the clamp is installed when the O-ring - Create a path for fluid or gas flow around the seal. When the O-ring with 40% and 25% of the extrusion, were installed two finite element model shows what happens. The model describes the assembly in men (piston), the O-ring hydraulic squeeze damaged O-ring seal. On a 40% level, difficult to avoid pinching, gripping and the elimination of the 25 percent level.

Hydraulic O-ring compression permanent deformation of the elastomer is applied by extrusion with the hardware, creating a sealing force, they tend to decay over time. When this power is completely attenuated, hydraulic O-ring will be retained, even if it is no longer crowded crowded shape. Compression set is a measure of this decay, expressed as a percentage. When the risk of compression up to 80%, most hydraulic O-ring seal in the loss of capacity. Hydraulic O-rings at a high level generally take longer to squeeze up to 80% compression set level. Based only on compression set, then a higher level of extrusion generally translated as a longer working life of the O-ring.

Designers need to carefully consider all of these factors - in addition to other application-specific factors, such as pressure and temperature of the material is sealed - before they decide how much O-ring extrusion applications. The right decision to switch to the best sealing of the O-ring over the longest life span with minimal damage or O-ring itself or its mating hardware. To ensure that the O-ring (O-type rubber seals) is not distorted can not be excessive stretch O-ring (O-type rubber seals).