在阀门使用中，不产生相对运动，始终处于相对静止状态的密封面，称为静密封，起密封作用的表面叫做静密封面。

　　In the use of valves, the sealing surface that does not produce relative motion and remains in a relatively static state is called a static seal, and the surface that plays a sealing role is called a static sealing surface.

　　在阀门上，静密封面的结构形式很多，有平面和锥面之别，有垫片和无垫片之分，还有强制和自紧密封等。静密封面是阀门的重要部位，也是产生“跑冒滴漏”的主要部位之一。静密封面损坏的主要原因见下表。

　　There are many structural forms of static sealing surfaces on valves, including flat and conical surfaces, gaskets and no gaskets, as well as forced and self tightening seals. The static sealing surface is an important part of the valve and also one of the main parts that cause "leakage". The main reasons for the damage of the static sealing surface are shown in the table below.

　　静密封面损坏的原因

　　Reasons for damage to the static sealing surface

　　损坏形式损坏原因举例静密封面严重锈蚀主要是介质的腐蚀和阀门的选用

　　The main reasons for the damage include severe rusting of the static sealing surface due to the corrosion of the medium and the selection of valves

　　不当截止阀的螺纹密

　　Improper thread tightness of shut-off valve

　　封面静密封面

　　Cover static seal cover

　　有严重划伤和铲伤主要是拆卸、清洗、装配过程中，

　　Serious scratches and shovel injuries are mainly caused during the disassembly, cleaning, and assembly processes,

　　违反操作规程，产生磕、碰、划伤

　　Violation of operating procedures resulting in bumps, impacts, and scratches

　　和用力不当截止阀、闸阀刚

　　Improper use of force on globe valves and gate valves

　　性平面密封连接静密封面有明显压痕主要是选用垫片材质硬度过高，

　　The obvious indentation on the static sealing surface of the sexual plane sealing connection is mainly due to the high hardness of the gasket material used,

　　光洁度不高或在装配时混入了砂粒、

　　The smoothness is not high or sand particles are mixed in during assembly

　　焊瘤等赃物截止阀、闸阀透

　　Weld bead and other contaminated materials, shut-off valves, and gate valves are transparent

　　镜垫法兰连接或锥

　　Mirror pad flange connection or cone

　　面垫片密封连接静密封面不光洁主要原因是使用时间过长，介质

　　The main reason why the static sealing surface of the face gasket seal connection is not smooth is due to prolonged use of the medium

　　的侵蚀，未定期检查、维修所致平面螺纹连接的

　　Corrosion caused by irregular inspection and maintenance of flat threaded connections

　　密封面和无垫剐性

　　Sealing surface and no pad scratch

　　密封面静密封有明显沟槽静密封面存在划痕而产生泄漏后，

　　The sealing surface has obvious grooves and scratches on the static sealing surface, causing leakage,

　　未及时修理，受到介质强烈的冲蚀，

　　Not repaired in a timely manner, subjected to strong erosion by the medium,

　　使划痕越来越大，形成沟槽法兰光滑面静密

　　Make the scratches bigger and bigger, forming a smooth and compact groove flange surface

　　封及斜自紧密封

　　Sealing and oblique self tightening sealing

　　连接静密封面发生变形由于静密封面刚度不够，装配时

　　The deformation of the connecting static sealing surface is due to insufficient rigidity of the static sealing surface during assembly

　　用力过大，使其产生变形，或高温

　　Excessive force causing deformation or high temperature

　　下产生热蠕变形榫槽面法兰连接静密封面有裂纹设计时选用的材质和制造质量差，

　　The material and manufacturing quality used in the design of the static sealing surface of the flange connection with cracks caused by thermal creep deformation are poor,

　　安装或操作不当，长期处在交变载

　　Improper installation or operation, long-term exposure to alternating loads

　　荷下而产生疲劳裂纹榫槽面、梯形槽

　　Fatigue cracks occur under load on the tenon groove surface and trapezoidal groove

　　面的法兰连接和平

　　Face flange connection and flatness

　　面刚性密封连接静密封面有泄漏孔主要是制造质量不好引起的皱折、

　　The leakage holes on the static sealing surface of the rigid sealing connection are mainly caused by wrinkles and folds due to poor manufacturing quality

　　气孔、夹渣等缺陷所致一般静密封面都

　　Generally, static sealing surfaces are caused by defects such as pores and slag inclusions

　　可能出现

　　may occur

　　静密封面的修理

　　Repair of static sealing cover

　　1．凸面外圆的修整

　　1. Trimming of convex surface and outer circle

　　在凸凹面、榫槽面中，由于制造质量，凸凹表面碰伤、变形，使凸面套不进凹面中。除车削外，可用锉刀修整。

　　In convex and concave surfaces, as well as mortise and tenon surfaces, due to manufacturing quality, the convex and concave surfaces are damaged or deformed, making it difficult for the convex surface to fit into the concave surface. Except for turning, files can be used for trimming.

　　其修整方法是：将工件夹在虎钳上，把平锉平放在凸面外圆上，平锉光面侧靠着台后肩，在锉削中一边作往复运动，一边上下作圆弧运动，锉一会儿后调换一个方向，一直沿整圆锉完。锉削圆弧连接自然，直到要求尺寸为止，凸凹面配合间隙为H11／d11。

　　The trimming method is: clamp the workpiece on a vise, place the flat file flat on the outer circle of the convex surface, place the smooth side of the flat file against the back shoulder of the table, make a reciprocating motion while filing, and make an arc motion up and down at the same time. After filing for a while, change the direction, and file along the whole circle. File the circular arc connection naturally until the required size is reached, with a clearance of H11/d11 between the convex and concave surfaces.

　　2．梯形槽的修理

　　2. Repair of trapezoidal groove

　　梯形槽由于腐蚀、压击而损坏。修理时，将工件夹在车床上，用千分表校正，在梯形槽的面上车削掉1mm左右的厚度，然后按梯形槽尺寸套出新的梯形槽，槽的内外侧粗糙度≤3.2。

　　The trapezoidal groove is damaged due to corrosion and impact. When repairing, clamp the workpiece on the lathe, calibrate it with a dial gauge, cut off about 1mm of thickness on the surface of the trapezoidal groove, and then insert a new trapezoidal groove according to the size of the groove. The roughness of the inner and outer sides of the groove should be ≤ 3.2.

　　3．螺纹堵头的修理

　　3. Repair of threaded plugs

　　螺纹堵头是阀门体和阀门盖上常见的静密封点，用它注水试压或排放介质。根据工况条件和损坏程度，采用如下方法修复。

　　Threaded plugs are common static sealing points on valve bodies and valve covers, used for water injection pressure testing or medium discharge. According to the working conditions and degree of damage, the following methods are used for repair.

　　轻微损坏采用研磨、换垫或者在堵头螺纹上缠绕聚四氯乙烯胶带、密封胶等；堵头损坏应更换；螺孔滑丝可采用扩孔攻丝，加工新堵头或者堆焊填满螺孔后，重新钻孔攻丝。

　　Minor damage can be caused by grinding, replacing pads, or wrapping polytetrafluoroethylene tape, sealant, etc. around the plug threads; Damaged plugs should be replaced; The sliding thread of the screw hole can be tapped by enlarging the hole, machining a new plug or welding to fill the screw hole, and then re drilling and tapping.

　　4．静密封面堆焊修复

　　4. Welding repair of static sealing surface

　　把静密封面上的缺陷车除，按本体材料选用焊条，为了防止焊液流失，应预制向衬圈固定堆焊处内侧，其材料与本体一致。然后按照堆焊规程施焊，车削成新的静密封面。堆焊体应无裂纹、气孔等缺陷，强度试验合格。

　　Remove the defects on the static sealing surface, select welding rods according to the material of the body, and in order to prevent the loss of welding fluid, prefabricate the inner side of the welding seam fixed to the lining ring, with the material consistent with the body. Then weld according to the welding procedure and turn it into a new static sealing surface. The welded body should be free of defects such as cracks and pores, and the strength test should be qualified.

　　5．静密封面的更换

　　5. Replacement of static sealing surface

　　静密封面因腐蚀严重、裂纹、掉块等无法修补时，可进行更换。新加工的静密封面应符合原静密封面尺寸和技术要求，无法查到静密封面尺寸时，可根据静密封实测面尺寸进行加工。

　　When the static sealing surface cannot be repaired due to severe corrosion, cracks, or chipping, it can be replaced. The newly processed static sealing surface should meet the original static sealing surface size and technical requirements. If the static sealing surface size cannot be found, processing can be carried out based on the measured static sealing surface size.

　　(1)焊接更换。焊接更换是预制好静密封圈(应留有一定的加工余量)，嵌入已加工好的本体内，然后施焊，使静密封圈与本体成一整体，再进行加工、研磨。

　　(1) Welding replacement. Welding replacement is the process of prefabricating a static sealing ring (with a certain amount of processing allowance), embedding it into the already processed body, and then welding it to make the static sealing ring integrated with the body, followed by processing and grinding.

　　(2)粘接更换。对于铸铁或非金属阀门不便采用焊接更换时，可选用适合的胶粘剂将预制好的静密封圈牢固地粘接在本体上，然后进行研磨修正。

　　(2) Adhesive replacement. When welding replacement is inconvenient for cast iron or non-metallic valves, a suitable adhesive can be used to firmly bond the prefabricated static sealing ring to the body, and then grind and correct it.