Specification of seal ring pipe trench and pipe trench

1. The O-Ring is installed in the pipe trench. Appropriately reduce the cross-section of the O-ring Seal. It can be used as a variety of hydrodynamic Sealing applications such as oil, water, gas, and some vapors.

There are two types of instructions for use: static and fitness. Compared with other sealing rings, it has the following advantages:

1) The structure of the sealing position is simple, the installation position is compact, and the net weight is relatively light.

2) It has self-sealing effect, usually only one hydraulic seal can achieve the actual effect of sealing.

3) Good sealing characteristics, basically no leakage when used as a fixed and immovable sealing, and only when the speed is high when the leakage occurs.

4) The friction resistance of fitness exercise is small, and it can also be integrated in places where work pressure is exchanged.

5) Specifications and pipe trenches have long been standardized, the cost is cheap, and the goods are very easy to obtain, which is conducive to application and outsourcing.

The problem of o-ring in the pipe groove:

1) The starting friction is relatively large.

2) When used as the airtightness of pneumatic equipment, be sure to add grease to avoid damage.

3) The production and processing specifications and precision regulations for coupling parts, such as fitness sports surfaces, pipe grooves, and intermittent, are very strict.

Working pressure and sealing gap

The o-type silicone Sealing ring is usually sealed by the resilience caused by the shrinkage, but with the increase of the working pressure, it is squeezed into the sealing turbidity and causes the appearance to change. In order to make the o-ring have excellent sealing performance and increase the service life, it is necessary to make the installation groove of the o-ring and the gap design of the sealing member appropriate. When the gap is too large, the o-ring will be squeezed under the effect of steam pressure. Press the gap, thereby causing leakage. When the pressure is lower than 9.8Mpa, a flat washer is usually not designed. When the working pressure exceeds 9.8Mpa, the bearing surface of the O-ring is very easy to be squeezed, so a flat washer should be added; if a single project is stressed, set it on the bearing surface Flat washer, if force is applied on both sides, set another flat washer.

In the elastomer material specification, the binomial properties of strength and shrinkage deformation are more critical. The selection of vulcanized rubber materials with less shrinkage deformation is beneficial to the sealing properties, and the strength is particularly important for the o-ring pressure test and extrusion resistance. According to Chinese standards and social experience, the shrinkage deformation of vulcanized rubber at the required temperature is not more than 50%, and the strength of vulcanized rubber is closely related to the sealing pressure. The higher the working pressure, the higher the strength.

In rotating fitness exercise, the pressure usually does not exceed 0.4Mpa, and the intensity is selected at 70±5 degrees; if it exceeds 0.4Mpa, it is designed according to the unique sealing equipment.

Pipe trenches and reductions

The compression rate of the o-ring used for fixed and immovable sealing is usually 15~25%, and the compression rate is 10~20% under the condition of repeated exercise in fitness exercise, and 3~5 compression in rotating fitness exercise. Rate.