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Causes and preventive measures of Shanghai rubber joint pulling off

Time: 02-20 󰃯 Number of readings: 519 󰃳 Editor in charge: The sea 󰃗 Column: product focus

Introduction: Shanghai rubber joint can be divided into loose flange type, fixed flange type and thread type according to the connection mode, and can be divided into 5 types according to the structure, such as single ball, double ball, reducer, curved ball and air pressure coil. The tubular rubber part is composed of inner and outer layer rubber, cord layer and steel bead

Shanghai Rubber joint According to the connection mode, it can be divided into loose flange type, fixed flange type and thread type; according to the structure, it can be divided into 5 types: single sphere, double sphere, reducer, curved sphere and air pressure coil. It is composed of inner and outer layer rubber, cord layer and steel bead, which is vulcanized and then combined with metal flange or parallel joint loose sleeve. This product can reduce vibration and noise, and can compensate the thermal expansion and cold contraction caused by temperature change, and is widely used in various pipeline systems.

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   Shanghai rubber joint Pull off is usually manifested as follows:

1. Partial pulling off of flange and rubber joint ball: the rubber joint is composed of rubber joint ball and flange, and the flange sets the ball together through buckle groove. If the rubber joint design does not match well with the flange at the beginning, it is easy to pull off due to the traction force of the pipe, which is easy to cause secondary loss,

2. In the use of large-diameter rubber joint, the matching flat welding flange is a large-diameter flange, which will cause the rubber joint pull-out. The reason is that the sealing surface of the matching flat welding flange and the sealing surface of the rubber joint are not completely sealed. If the inner diameter of the matching flat welding flange exceeds the inner diameter of the rubber joint, the sealing performance of the rubber joint will be reduced, and it is easy to cause torus For example, the special flange of butterfly valve should be used, and the inner diameter should be consistent with the inner diameter of rubber joint.

3. If the transverse tension of the pipe is relatively large, it is necessary to install anti pulling device on the rubber joint, which can effectively protect the force of the rubber joint and avoid the damage of the rubber joint ball due to the tension exceeding the limit.

The main factors causing the flange to pull off are as follows:

1. It is that the mating flange of rubber joint is not standardized, and the commonly used large diameter flat welding flange is used. According to the national standard, the special flange for butterfly valve, namely small diameter flange, should be used to increase the contact area between rubber sealing surface and mating flange sealing surface, so as to prevent pulling phenomenon.

When installing and using Shanghai rubber joint, the following points must be observed:

1. It is strictly forbidden to install the rubber joint over displacement during installation.

2. When the rubber joint head is installed on the ground, in the air or vertically, the actual working axial displacement pressure of the rubber joint is less than the support force of the pipeline, otherwise, the anti pulling device should be installed to prevent the rubber joint from pulling off under pressure.

3. The pipeline needs fixed support or fixed bracket, and the force of fixed bracket should be greater than the axial force. During vertical installation and overhead installation, both ends of the product shall be installed with corresponding fixed support and stress support to prevent pulling off after working under pressure.

4. The installation bolts should be symmetrically and gradually pressurized and tightened to prevent local leakage.

5. Keep away from heat source during installation. Do not use media that does not meet the requirements of this product.

6. The matching flange of rubber joint must be the special flange of butterfly valve.

Shanghai rubber joint has good comprehensive performance, so it is widely used in chemical engineering, construction, water supply, drainage, petroleum, light and light industry, refrigeration, sanitation, water heating, fire protection, electric power and other basic projects. According to the different materials, it can be made into various varieties, such as acid resistance, alkali resistance, corrosion resistance, oil resistance, high temperature resistance, radiation resistance, wear resistance, aging resistance, etc., to adapt to a variety of media and environment.