異徑管(大小頭)是用于管道變徑處的一種管件。通常采用的成形工藝為縮徑壓制、擴徑壓制或縮徑加擴徑壓制，對某些規格的異徑管也可采用沖壓成形。異徑管的圓度不應大于相應端外徑的1%，且允許偏差為±3mm。異徑管的材質執行SY/T5037、GB/T9711、GB/T8163、美標ASTM A106/A53 GRB，API 5L、APT5CT、ASTM A105、ASTM A234、ASTM A106、DIN德國標準及客戶要求標準

1、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.

2、在泵的進口,為了防止汽蝕，需要采用異徑管.

3、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。

真空大小頭又稱異徑管是化工管件之一，用于兩種不同管徑的連接。又分為同心大小頭和偏心大小頭。先由圓鋼經過高溫鍛打做成相應規格的毛坯，質檢合格后經過CNC數控機床精車而成的一體件，通過氦氣檢漏等一系列檢驗，確定除合格產品。真空大小頭尺寸精確，表面處理精細，密閉性能良好。廣泛用于航天、航空、石油、石化、液化氣、醫藥、食品、電力、半導體、太陽能、機械設備配套、電子工業等產品領域。

Reducing pipe (size head) is a kind of pipe fitting used for pipe diameter change. Generally, the forming process is necking pressing, expanding pressing or necking plus expanding pressing, and stamping forming can also be used for reducing pipe of some specifications. The roundness of the reducing pipe shall not be greater than 1% of the outer diameter of the corresponding end, and the permissible deviation is ± 3 mm. SY/T5037, GB/T9711, GB/T8163, n Standard ASTM A106/A53 GRB, API 5L, APT5CT, ASTM A105, ASTM A234, ASTM A106, DIN German standards and customer requirements standards 1. When the flow rate in the pipeline changes, for example, increase or decrease, flow rate requirements change little, all need to use reducing pipe. 2. In the inlet of the pump, reducing pipe is needed to prevent cavitation. 3, with the instrument, such as flowmeter, control valve joints, in order to cooperate with the instrument joints, but also the use of reducing pipe. Vacuum Size Head, also known as reducing pipe is one of the chemical pipe fittings, used for the connection of two different pipe diameters. Also divided into concentric size head and eccentric size head. The round steel is made into the corresponding blank by high temperature forging, and the qualified product is determined through a series of tests, such as helium leak detection. The vacuum size head size is accurate, the surface treatment is fine, the airtight performance is good. Widely used in aerospace, aviation, petroleum, petrochemical, liquefied petroleum gas, medicine, food, electric power, semiconductor, solar energy, mechanical equipment, electronic industry and other product fields.

產品圖片：制藥用衛生級米勒不銹鋼真空大小頭價格

公司簡介：

安徽利勒潔凈設備科技有限公司是國內專業生產制造潔凈衛生級閥門管件，主要應用于食品機械行業、制藥機械行業、乳制品行業、釀酒飲料行業以及精細化工等行業高精度衛生級流體設備的專業生產廠家，產品規格齊全；產品主要有：制藥用衛生級米勒不銹鋼真空大小頭價格，無菌隔膜閥，卡箍直通隔膜閥，三通隔膜閥，法蘭隔膜閥，氣動隔膜閥，U型隔膜閥，罐底隔膜閥 ；無菌球閥，卡箍直通球閥，螺紋球閥，焊接球閥，氣動球閥，法蘭球閥，電動球閥；衛生級蝶閥，焊接蝶閥，卡箍直通蝶閥，螺紋蝶閥，法蘭蝶閥，氣動蝶閥，電動蝶閥；不銹鋼衛生泵，不銹鋼衛生級離心泵，不銹鋼衛生自吸泵，不銹鋼酒精防爆泵，衛生奶泵，衛生飲料泵；止回閥，過濾器、呼吸器、換向閥、防混閥、安全閥；衛生級不銹鋼管件，焊接彎頭，快裝彎頭，不銹鋼三通，快裝三通，四通，真空彎頭，大小頭；罐頂組件系列，不銹鋼儲罐，發酵罐，不銹鋼衛生級人孔，清洗球/器，視鏡燈，排氣閥等其它非標產品生產加工；我們竭誠為您服務.