异径管若选择的口径规格与工艺管道的内径不符，应进行相应的缩径或扩径处理，若对管道进行缩管，应考虑这样所引起的压力损失是否会影响工艺流程。异径管实际的使用和制作过程中按照的标准和工艺，制作的异径管能够满足市场中的使用需求，在行业中发挥重要性能价值。为了防止安装异径管后影响流速场的分布，造成压力的损失，进而降低电磁流量计的测量精度，要求的中心锥角α不大于15°，越小越好。有分为同心和偏心两种，同心异径管一般用在垂直管上；偏心异径管用于水平管，并且要注意标明顶平还是底平。
          当管道从上向下水平进泵时，异径管应取"底平"为防止气体在泵入口变径管处积聚，偏心异径管也有采用"顶平"的安装方式，即使管道从上向下水平进泵也如此。输送介质带有杂质的端部或侧面吸入的泵，当吸入速度低于其杂质沉降速度时，变径管应取"底平"插入水箱的管口直径相同。同一个水箱在插入不同的真空管组合时，可组装出七台不同热性能的热水器，即异径管机只要摆出一种样品，即可代表七种机型，其性能差、价位差一目了然，为庞杂的太阳能热水器开创了实现标准化的先河。
          异径管在具体的使用和操作过程中需要注意的事项和方法很多，主要有以下几个地方：当管道中流体的流量有变化时，比如增大或减少，流速要求变化不大时，均需采用异径管。泵的，为防止汽蚀。泵的水平入口管变径时，应选用偏心异径管。当管道从下向上水平进泵时，异径管应取"顶平"。与仪表，如流量计、调节阀的接头处，为了与仪表的接头配合，也需采用异径管。泵入口异径管的安装应使气体不在变径处积聚，避免因安装不当而产生气蚀。
If a choice of different-diameter pipe size specification and process diameter of pipe, should undertake corresponding non-reducing or diameter of pipe, if so, should consider the shrinkage of the pressure loss caused by affect process. Different-diameter pipe actual use and production process according to certain standards and technology, ensure production to meet the different-diameter pipe, the use of market demand in the industry plays an important property values. In order to prevent after installation of different-diameter pipe velocity distribution, the influence caused by pressure loss, thereby reducing the electromagnetic flowmeter measurement precision, the requirements of the center of alpha not greater than cone Angle, 55x55mm are 15 °. Are divided into two kinds, one and eccentric concentric different-diameter pipe commonly used in vertical pipe, Eccentric different-diameter pipe horizontal pipe, and used to indicate the top flat or attention.
When pipelines from downward into pumps, level of different-diameter pipe should be taken to prevent the flat ", "gas in the pump suction diameter changes in accumulation, eccentric different-diameter pipe has adopted the" top flat "installation way, even from the pipe down into the pump. Level With the medium of impurities in the pump suction side, when inhaled speed below its impurities settling velocity, bianjing tube should take "the tank bottom flat" insert the same orifice diameter. In the same tank vacuum tubes inserted different combinations, assembled from different thermal properties of water heater daytime, namely different-diameter pipe set out as a sample, can represent the poor performance of the seven, and price difference, the solar energy water heater for numerous pioneered realizes standardization.
Different-diameter pipe in the specific use and operation process need notices and method is very much, basically have the following places: when the pipe fluid flow changes, such as increasing or decreasing, velocity changed requirements, should be adopted different-diameter pipe. The import, in order to prevent the pump cavitation. Pump inlet pipe diameter changes when level, should choose eccentric different-diameter pipe. When the pipe from the upward horizontal into pump, different-diameter pipe should take the "top flat." With instruments, such as flowmeter, the regulator shall, in order to cooperate with meter connector, also adopted different-diameter pipe. Pump inlet different-diameter pipe installation should not make the gas accumulation, bianjing place to avoid improper installation and cavitation.