Like gate valve, ball valve, butterfly valve and other valve accessories are often more easily damaged than the valve itself, such as flange gasket, so how to replace the damaged flange gasket? The replacement of flange gasket needs to follow the following four basic principles, prepare materials and tools, pay attention to the operation steps, and meet two technical requirements and five key points.

（1）准备工作

(1) Preparatory work

①材料：黄油、棉纱、检漏液、密封垫片。

① Materials: butter, cotton yarn, leak detection fluid, sealing gasket.

②工具：扳手、螺钉旋具。

② Tools: spanner, screw driver.

（2）操作步骤

(2) Operation steps

①卸下法兰连接螺栓，拆下阀门或移去泄露端管段。清理干净密封面上废旧的密封垫。

① Remove the flange connecting bolts, remove the valve or remove the pipe section at the leakage end. Clean up the waste gasket on the sealing surface.

②选择合适的垫片，两面均匀涂抹一层黄油。

② Select the appropriate gasket and apply a layer of butter evenly on both sides.

③将密封垫片垫于两法兰之间的密封面上，对准两法兰中和螺栓孔中，装入螺栓，拧上螺母，均匀用力分多次对角拧紧螺母。螺栓伸出螺母长度2-3个螺距为宜。法兰垫片安装完毕后，应经过做工作压力试压无泄漏为合格。

③ Place the sealing gasket on the sealing surface between the two flanges, align the two flanges and the bolt hole, install the bolt, screw the nut, and tighten the nut diagonally for several times with uniform force. The length of the bolt extending out of the nut should be 2-3 pitches. After the flange gasket is installed, it shall pass the working pressure test without leakage.

（3）技术要求

(3) Technical requirements

①应小心操作，防止损坏法兰盘。

① Care should be taken to prevent damage to the flange.

②完工后，应对工具进行清洁、维护。

② After completion, the tools shall be cleaned and maintained.

（4）垫片安装五个要点

(4) Five key points of gasket installation

①选得对：法兰、螺栓、垫片的形式、材料、尺寸应根据操作条件和法兰面的结构形式选配适当。

① Right choice: the form, material and size of flange, bolt and gasket shall be properly selected according to the operating conditions and the structural form of flange surface.

②查得细：安装前应仔细检查法兰、螺栓、螺母、垫片的质量，应没有毛刺、凹凸不平、裂纹等缺陷。仔细检查法兰、管子安装情况，应无偏口、错口、错孔等现象。

② Check carefully: the quality of flanges, bolts, nuts and gaskets shall be carefully checked before installation, and there shall be no burr, unevenness, crack and other defects. Carefully check the installation of flanges and pipes, and there shall be no deviation, wrong mouth, wrong hole and other phenomena.

③洗得净：法兰密封面需要清洗干净，螺栓、垫片不得粘有杂质、油污等。

③ Clean: the flange sealing surface needs to be cleaned, and the bolts and gaskets shall be free of impurities, oil stains, etc.

④装得正：垫片应与管子或管件同心。

④ Proper installation: the gasket shall be concentric with the pipe or pipe fitting.

⑤上得匀：安装螺栓、螺母应用力均匀，分多次对称拧紧。

⑤ Even up: install bolts and nuts with uniform force and tighten symmetrically for many times.

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