How to select and use metal expansion joints correctly?
As a frequently used pipeline accessory, the correct selection and use of metal expansion joints is very important. The following two aspects should be considered when designing. 1. Select the appropriate expansion joint According to the medium in the pipeline, pressure, pipeline expansion and the angle to be adjusted during installation, choose the expansion joint of the corresponding material, pressure level and connection method. 2. Consider all factors to determine a reasonable installation location In general, metal expansion joints are used together with valves and check valves. In addition to consider to meet the normal operating requirements, should also consider to meet the maintenance requirements. Especially in the maintenance of equipment, valves, valves after the pressure in the pipeline still exists, the design of the expansion joint will be installed after the valve according to the flow direction of the medium, and should consider setting a valve for maintenance on the pipeline after the expansion joint; for infrequent maintenance, from an economic point of view, the expansion joint can be modified, set a limit device; such as the pipeline has been set up two valves, the expansion joint can be installed Between the two valves. In the case shown in the figure, the expansion joint should be installed between the electric butterfly valve and the manual butterfly valve, so that the manual butterfly valve can be closed during maintenance, and the equipment and valve in front of it can be serviced or replaced. The limiting function of the metal expansion joint is to lock with double nuts at the large expansion volume. The pipe is free to expand and contract within the allowed expansion volume, and once it exceeds its large expansion volume it acts as a limit to ensure the operation of the pipe. The role of this device on the metal expansion joint and the influence it plays in the whole pipeline line cannot be ignored.
