在閥門使用中，不產生相對運動，始終處于相對靜止狀態的密封面，稱為靜密封，起密封作用的表面叫做靜密封面。

　　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.

　　在閥門上，靜密封面的結構形式很多，有平面和錐面之別，有墊片和無墊片之分，還有強制和自緊密封等。靜密封面是閥門的重要部位，也是產生“跑冒滴漏”的主要部位之一。靜密封面損壞的主要原因見下表。

　　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.

　　靜密封面損壞的原因

　　Reasons for damage to the static sealing surface

　　損壞形式損壞原因舉例靜密封面嚴重銹蝕主要是介質的腐蝕和閥門的選用

　　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

　　不當截止閥的螺紋密

　　Improper thread tightness of shut-off valve

　　封面靜密封面

　　Cover static seal cover

　　有嚴重劃傷和鏟傷主要是拆卸、清洗、裝配過程中，

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

　　違反操作規程，產生磕、碰、劃傷

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

　　和用力不當截止閥、閘閥剛

　　Improper use of force on globe valves and gate valves

　　性平面密封連接靜密封面有明顯壓痕主要是選用墊片材質硬度過高，

　　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,

　　光潔度不高或在裝配時混入了砂粒、

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

　　焊瘤等贓物截止閥、閘閥透

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

　　鏡墊法蘭連接或錐

　　Mirror pad flange connection or cone

　　面墊片密封連接靜密封面不光潔主要原因是使用時間過長，介質

　　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

　　的侵蝕，未定期檢查、維修所致平面螺紋連接的

　　Corrosion caused by irregular inspection and maintenance of flat threaded connections

　　密封面和無墊剮性

　　Sealing surface and no pad scratch

　　密封面靜密封有明顯溝槽靜密封面存在劃痕而產生泄漏后，

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

　　未及時修理，受到介質強烈的沖蝕，

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

　　使劃痕越來越大，形成溝槽法蘭光滑面靜密

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

　　封及斜自緊密封

　　Sealing and oblique self tightening sealing

　　連接靜密封面發生變形由于靜密封面剛度不夠，裝配時

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

　　用力過大，使其產生變形，或高溫

　　Excessive force causing deformation or high temperature

　　下產生熱蠕變形榫槽面法蘭連接靜密封面有裂紋設計時選用的材質和制造質量差，

　　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,

　　安裝或操作不當，長期處在交變載

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

　　荷下而產生疲勞裂紋榫槽面、梯形槽

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

　　面的法蘭連接和平

　　Face flange connection and flatness

　　面剛性密封連接靜密封面有泄漏孔主要是制造質量不好引起的皺折、

　　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

　　氣孔、夾渣等缺陷所致一般靜密封面都

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

　　可能出現

　　may occur

　　靜密封面的修理

　　Repair of static sealing cover

　　1．凸面外圓的修整

　　1. Trimming of convex surface and outer circle

　　在凸凹面、榫槽面中，由于制造質量，凸凹表面碰傷、變形，使凸面套不進凹面中。除車削外，可用銼刀修整。

　　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：將工件夾在虎鉗上，把平銼平放在凸面外圓上，平銼光面側靠著臺后肩，在銼削中一邊作往復運動，一邊上下作圓弧運動，銼一會兒后調換一個方向，一直沿整圓銼完。銼削圓弧連接自然，直到要求尺寸為止，凸凹面配合間隙為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

　　梯形槽由于腐蝕、壓擊而損壞。修理時，將工件夾在車床上，用千分表校正，在梯形槽的面上車削掉1mm左右的厚度，然后按梯形槽尺寸套出新的梯形槽，槽的內外側粗糙度≤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．螺紋堵頭的修理

　　3. Repair of threaded plugs

　　螺紋堵頭是閥門體和閥門蓋上常見的靜密封點，用它注水試壓或排放介質。根據工況條件和損壞程度，采用如下方法修復。

　　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.

　　輕微損壞采用研磨、換墊或者在堵頭螺紋上纏繞聚四氯乙烯膠帶、密封膠等；堵頭損壞應更換；螺孔滑絲可采用擴孔攻絲，加工新堵頭或者堆焊填滿螺孔后，重新鉆孔攻絲。

　　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．靜密封面堆焊修復

　　4. Welding repair of static sealing surface

　　把靜密封面上的缺陷車除，按本體材料選用焊條，為了防止焊液流失，應預制向襯圈固定堆焊處內側，其材料與本體一致。然后按照堆焊規程施焊，車削成新的靜密封面。堆焊體應無裂紋、氣孔等缺陷，強度試驗合格。

　　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．靜密封面的更換

　　5. Replacement of static sealing surface

　　靜密封面因腐蝕嚴重、裂紋、掉塊等無法修補時，可進行更換。新加工的靜密封面應符合原靜密封面尺寸和技術要求，無法查到靜密封面尺寸時，可根據靜密封實測面尺寸進行加工。

　　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)焊接更換。焊接更換是預制好靜密封圈(應留有一定的加工余量)，嵌入已加工好的本體內，然后施焊，使靜密封圈與本體成一整體，再進行加工、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)粘接更換。對于鑄鐵或非金屬閥門不便采用焊接更換時，可選用適合的膠粘劑將預制好的靜密封圈牢固地粘接在本體上，然后進行研磨修正。

　　(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.