Fully sealed rubber joints, also known as rubber expansion joints, vibration dampers, and flexible rubber joints, primarily function in pipelines to reduce vibration and noise. They consist of a composite rubber core, vulcanized at high temperatures, and steel flanges at both ends. The flange faces are grooved, allowing the rubber ball to be secured within the flange grooves to prevent pull-out. Typical pressure ratings are 0.6MPa, 1.0MPa, and 1.6MPa. If the pipeline displacement force is large, an anti-pull-out limiting device must be installed on the flange. For excessively high pipeline pressures, a fully sealed rubber joint, commonly known as a flexible, fully sealed rubber joint, can be selected.
Installation and Use: Rubber joints should be kept away from high temperatures, ozone, oil, and acidic or alkaline environments. Pipelines used outdoors or in sunny, windy conditions should be shaded to prevent exposure to direct sunlight, rain, and drafts. Painting or wrapping insulation materials on the joint surface is strictly prohibited. Due to the The aging nature of rubber products, it is recommended that you inspect and replace them regularly.
When installing rubber joints in pipelines, they must be allowed to remain in their natural state; avoid any artificial deformation during installation. When the pipeline medium is acid- or alkali-resistant, oil-resistant, high-temperature resistant, or contains other special materials, a joint with a pressure rating one level higher than the pipeline’s working pressure should be selected.
The normal applicable medium for rubber joints is ordinary water at a temperature of 0-60°C. For special media such as oil, acids, alkalis, high temperatures, and other corrosive or hard materials, corresponding special-resistant rubber joints should be selected. Do not use generic joints indiscriminately.
When rubber joints are used at the inlet and outlet of a water pump, they should be located on the pump side. A metal reducer should be installed between the rubber joint and the pump, and the joint should be installed at the larger diameter end of the reducer. 5. When the pipeline displacement is greater than or equal to the joint’s maximum compensation, the number of joints should be increased to accommodate the displacement. It is strictly forbidden to subject the joint to extreme flexural displacement or deviation in order to adjust for pipeline deviations, and it is even more forbidden to exceed limits (expansion, displacement, deflection). Specific installation data is shown in the table below.
For high-rise or suspended water supply systems, the pipeline should be fixed to hangers, brackets, or anchors. The joint should not bear the weight of the pipeline itself or axial force; otherwise, the joint should be equipped with an anti-pull-out device (its bearing capacity must be greater than the pipeline’s axial force).
When installing rubber joints, the bolt shanks should extend outwards from the joint. The bolts on each flange end should be tightened repeatedly and evenly using a diagonal tightening method to prevent uneven pressure. Threaded joints should be tightened evenly using a standard wrench. Do not use a lever to apply extra force, as this can cause stripping, slippage, and breakage of the joint. Regular inspections are necessary to prevent loosening, which could lead to detachment or water leakage.
After the rubber joint has been subjected to pressure for the first time (e.g., during installation pressure testing) or before being put back into operation after a long period of inactivity, the bolts should be retightened.
Performance Characteristics:
If the pipeline pressure is too high, limit bolts should be used to connect the flanges at both ends.
Fully sealed rubber joints significantly reduce vibration and noise in pipeline systems, fundamentally solving problems such as interface displacement, axial expansion and contraction, and misalignment in various pipelines.
Depending on the material, JGD type flexible rubber joints can be manufactured in various varieties, including acid-resistant, alkali-resistant, corrosion-resistant, oil-resistant, and heat-resistant types, adaptable to various media and environments.
The material is polar rubber, offering excellent sealing performance, lightweight, convenient installation and maintenance, and a long service life. However, avoid contact with sharp metal instruments to prevent puncturing the sphere.
For overhead applications, flexible supports can be used. During installation, bolts should be tightened diagonally.