法兰（Flange）又叫法兰盘或突缘。法兰是使管子与管子相互连接的零件，连接于管端。法兰上有螺栓孔眼，螺栓使两法兰紧连。法兰间通常用衬垫（法兰垫片）密封。

1、按化工(HG)行业标准分：整体法兰(IF)、螺纹法兰(Th)、板式平焊法兰(PL)、带颈对焊法兰(WN)、带颈平焊法兰(SO)、承插焊法兰(SW)、对焊环松套法兰(PJ/SE)、平焊环松套法兰(PJ/RJ)、衬里法兰盖(BL(S))、法兰盖(BL) [2]  。

2、按石化(SH)行业标准分：螺纹法兰(PT)、对焊法兰(WN)、平焊法兰(SO)、承插焊法兰(SW)、松套法兰(LJ)、法兰盖(不表注)。

3、按机械(JB)行业标准分：整体法兰、对焊法兰、板式平焊法兰、对焊环板式松套法兰、平焊环板式松套法兰、翻边环板式松套法兰、法兰盖。

4、按国家(GB)标准分：整体法兰、螺纹法兰、对焊法兰、带颈平焊法兰、带颈承插焊法兰、对焊环带颈松套法兰、板式平焊法兰、对焊环板式松套法兰、平焊环板式松套法兰、翻边环板式松套法兰、法兰盖。

Flange is also called flange or flange. The flange is a part that connects the pipe and the pipe to each other, and is connected to the pipe end. There are bolt holes on the flange, and the bolt connects the two flanges tightly. The flanges are usually sealed with gaskets (flange gaskets).

1. According to the chemical industry (HG) industry standards: integral flange (IF), threaded flange (Th), plate flat welding flange (PL), neck butt welding flange (WN), neck flat welding flange (SO), socket welding flange (SW), butt welding ring loose flange (PJ/SE), flat welding ring loose flange (PJ/RJ), lining flange cover (BL(S)), Flange cover (BL) [2].

2. According to the petrochemical (SH) industry standard: threaded flange (PT), butt welding flange (WN), flat welding flange (SO), socket welding flange (SW), loose flange (LJ) , Flange cover (not shown).

3. According to machinery (JB) industry standards: integral flange, butt welding flange, plate flat welding flange, butt welding ring plate loose flange, flat welding ring plate loose flange, flanged ring plate loose flange Flange, flange cover.

4. According to national (GB) standards: integral flanges, threaded flanges, butt welding flanges, neck flat welding flanges, neck socket welding flanges, butt welding ring neck loose flanges, plate flat flanges Welding flanges, butt-welding ring plate loose flanges, flat welding ring plate loose flanges, flanged ring plate loose flanges, flange covers.

图片信息：卫生级ISO-K法兰不锈钢真空法兰盘生产厂家

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