Expansion joints are new products for connecting pumps, valves, pipelines and other equipment with pipelines. They are connected by full bolts to make them a whole and have a certain amount of displacement, so that during installation and maintenance, they can be installed and maintained according to the size of the site. Adjustments are made to transmit axial thrust back to the entire piping system during operation. This not only improves the work efficiency, but also plays a certain role in protecting the pipeline equipment such as pumps and valves. Expansion joints are also called metal loose sleeve expansion joints. The expansion joints are made of metal casting or welding. The loose sleeve parts are made of trapezoidal circular rubber sealing rings. Under the action of the gland and screw bolts, the compression elastic deformation principle of rubber is used to force The sealing ring is deformed to perform static sealing between the outer walls of the expansion pipe of the expansion joint body. The metal material and sealing ring of the expansion joint are selected strictly according to the performance and user requirements. The material of the expansion joint is filled with high-strength anti-corrosion paint, and the connecting bolts of each part of the expansion joint are made of high-strength lime steel or stainless steel. Because the expansion joint body occupies a certain gap between the expansion pipes, it has a certain axial and radial displacement. Therefore, the expansion joint can effectively compensate and relieve the thrust of the blind plate of the pipeline in the pipeline, and can also facilitate the operation of pumps and valves. Installation, maintenance and replacement, expansion joints are the most ideal supporting products in pipeline installation and operation.

Classification of expansion joint products:

KRHD steel flexible joint, JXF flexible filter expansion joint, AF (VSSJA) flange expansion joint, BY (SSJB-3) gland loose sleeve limit expansion joint, BF (VSSJA-1) single Flange limit expansion joint, AY (SSJB) type gland type expansion joint, SSJB type gland type expansion joint, SSJB-3 type gland type expansion joint, VSSJA type flange loose sleeve expansion joint, VSSJA-1 type single Flange limit expansion joint, loose sleeve expansion joint, gland type expansion joint, gland type loose sleeve expansion joint, VSSJA--2 type double flange limit expansion joint, double flange limit expansion joint, double flange Expansion joint, flange type loose sleeve expansion joint, flange rubber expansion joint, single flange expansion joint, limit expansion joint, gland type limit expansion joint, double flange limit expansion joint, double flange limit transmission Force joint

The main materials of expansion joints are:

QT-400 (ductile iron), Q235A (carbon steel), HT20 (gray iron), 1Cr18Ni9Ti (stainless steel).

The use of expansion joints

The expansion joint is mainly to ensure the safe operation of the pipeline, and has the following functions: compensating and absorbing the axial, lateral and angular thermal deformation of the pipeline; absorbing equipment vibration and reducing the impact of equipment vibration on the pipeline; absorbing the deformation of the pipeline from earthquakes and subsidence. This product provides great convenience for the installation and disassembly of various water supply and drainage pipelines, water towers, pumps, water meters and valves, and plays a good role in regulating the expansion and contraction of long-distance pipelines due to temperature differences.

Because the expansion joint series products are metal products, they have high tensile and compressive strength, superior soft sealing performance, convenient loading and unloading and other functions. They are widely used in electric power, metallurgy, chemical industry, water supply and drainage, sewage treatment and other industries. It acts on the connection between the pump and the valve and the pipeline. The expansion joint has a certain multi-directional displacement effect in the operation of the pipeline, and has an important expansion and compensation effect on the pipeline due to thermal expansion and contraction, crustal subsidence and stress during operation. Therefore, the expansion joint can alleviate the blind plate in the pipeline operation. The thrust can protect the pipeline to a certain extent, especially it provides great convenience for the installation and maintenance of the pipeline. However, at the outlet of the pump and at the corner of the pipeline, in the sliding pipeline connection without fixed buttresses, infinite buttresses and directional limit buttress brackets, force transmission joints and limit force transmission joints shall be used, or limit expansion and contraction shall be adopted. expansion joints (expansion joints) and anti-pull-off limit rubber joints, as well as limit expansion joints and clamp flexible joints, because the force-transmitting joints can use the force-transmitting bolts (that is, full-wire bolts) to reduce the thrust of the blind plate when the pump is started. Conducted to various parts of the pump and pipeline to avoid the thrust concentrated at the corner of the pipeline or the proximal end of the pump, and the impact force will damage the equipment. In fact, in the use of various pipelines, expansion joints, force transmission joints, expansion joints (expansion joints) and rubber joints, clamp flexible joints (flexible clamp joints referred to as clamp joints) and quick joints have their own advantages in pipeline connection. A common effect, which plays the role of telescopic compensation and displacement for the operation of the pipeline. Because they have this commonality in the pipeline connection, they have complementary and interchangeable alternatives in the use of pipeline connection. Various types of pipe fittings are used. Most of the design units and installation engineering companies are based on the location of the pipeline connection, and whether the connection is in the sliding pipeline and between the pipeline corner and the pump valve, whether there are fixed buttresses, infinite buttresses and orientation in the pipeline. Limit buttress bracket, which type of pipe joint above should be reasonably selected.www.yzjbwg.com