異徑管若選擇的口徑規格與工藝管道的內徑不符，應進行相應的縮徑或擴徑處理，若對管道進行縮管，應考慮這樣所引起的壓力損失是否會影響工藝流程。異徑管實際的使用和制作過程中按照一定的標準和工藝，保證制作的異徑管能夠滿足市場中的使用需求，在行業中發揮重要性能價值。為了防止安裝異徑管后影響流速場的分布，造成壓力的損失，進而降低電磁流量計的測量精度，要求的中心錐角α不大于15°，越小越好。有分為同心和偏心兩種，同心異徑管一般用在垂直管上；偏心異徑管用于水平管，并且要注意標明頂平還是底平。
          當管道從上向下水平進泵時，異徑管應取"底平"為防止氣體在泵入口變徑管處積聚，偏心異徑管也有采用"頂平"的安裝方式，即使管道從上向下水平進泵也如此。輸送介質帶有雜質的端部或側面吸入的泵，當吸入速度低于其雜質沉降速度時，變徑管應取"底平"插入水箱的管口直徑相同。同一個水箱在插入不同的真空管組合時，可組裝出七臺不同熱性能的熱水器，即異徑管機只要擺出一種樣品，即可代表七種機型，其性能差、價位差一目了然，為龐雜的太陽能熱水器開創了實現標準化的先河。
          異徑管在具體的使用和操作過程中需要注意的事項和方法很多，主要有以下幾個地方：當管道中流體的流量有變化時，比如增大或減少，流速要求變化不大時，均需采用異徑管。泵的進口，為防止汽蝕。泵的水平入口管變徑時，應選用偏心異徑管。當管道從下向上水平進泵時，異徑管應取"頂平"。與儀表，如流量計、調節閥的接頭處，為了與儀表的接頭配合，也需采用異徑管。泵入口異徑管的安裝應使氣體不在變徑處積聚，避免因安裝不當而產生氣蝕。
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.