Installing flexible rubber joints on the pipeline can compensate for the expansion and contraction of the pipeline and reduce installation errors, and can also reduce the damage caused by pipeline vibration to other equipment.

This type of rubber joint is mostly used for pumping stations and violently vibrating pipes in civil buildings, and mainly serves as an isolation; in industrial buildings。It is connected to valves or equipment, mainly to facilitate the maintenance and replacement of valves and equipment. Flexible rubber joints installed at the pump's outlet end and in the piping system, if not equipped with anti-dropout and limit devices (bolts).

When the piping system is running, the fluid in the pipeline acts on the blind end of the pipeline, the valve, the reducer. The thrust (blind plate force) on the pipe, elbow and other pipe fittings can expand the flexible rubber joint or extend the expansion joint, which may push the pipeline to cause a certain sliding offset.

When the pump outlet pressure is high, a large thrust will be generated along the axis of the pipeline. If measures are not taken to eliminate the blind force of the piping system in the design, the pipeline or equipment may be displaced in the light. And the pump casing may be damaged or the flexible rubber joint will be pulled out of the flange and the expansion joint will be pulled on, causing the equipment system to malfunction.

Therefore, in the design of pump piping, it should be analyzed whether the piping system itself can eliminate the blind plate force. If it cannot be eliminated, you should choose anti-pulling flexible rubber joints and limit expansion joints or set a fixed pipe rack to eliminate the blind plate. The impact of the force on the pipeline system to avoid unnecessary losses.

The role of installing rubber joints at the outlet of the pump is to reduce vibration, to meet the needs of thermal expansion and contraction, and to facilitate valve disassembly and maintenance. The actual installation sequence should be: rubber soft connection, check valve, gate valve . The pressure gauge is best installed on the pump outlet, but it must be in front of the check valve. During normal work, the gate valve is not very easy to operate, and the check valve is frequently operated, so the maintenance probability is large. When the pump is closed, the gate valve of the pump can be repaired without affecting the normal operation of the system. The pressure gauge is installed in front of the check valve to prevent the water hammer from impacting and damaging the pressure gauge.