1、 Valve body leakage:

原因：1.阀体有砂眼或裂纹;2.阀体补焊时拉裂

Reason: 1 There are sand holes or cracks in the valve body; 2. The valve body is cracked during repair welding

处理：1.对怀疑裂纹处磨光，用硝酸溶液浸蚀，如有裂纹就可显示出来;2.对裂纹处进行挖补处理。

Treatment: 1 Polish the suspected crack and etch it with nitric acid solution. If there is a crack, it can be displayed; 2. Repair the crack.

二、阀杆及与其配合的丝母螺纹损坏或阀杆头折断、阀杆弯曲:

2、 The valve rod and its matching screw thread are damaged or the valve rod head is broken, and the valve rod is bent:

原因：1.操作不当，开关用力过大，限位装置失灵，过力矩保护未动作。;2.螺纹配合过松或过紧;3.操作次数过多、使用年限过久

Reason: 1 Improper operation, excessive switch force, failure of limit device and failure of over torque protection.; 2. The thread fit is too loose or tight; 3. Too many operations and too long service life

处理：1.改进操作，不可用力过大;检查限位装置，检查过力矩保护装置;2.选择材料合适，装配公差符合要求;3.更换备品

Treatment: 1 Improve the operation and do not use too much force; Check the limit device and over torque protection device; 2. Select appropriate materials and the assembly tolerance meets the requirements; 3. Replace spare parts

三、阀盖结合面漏

3、 Valve cover joint surface leakage

原因：1.螺栓紧力不够或紧偏;2.垫片不符合要求或垫片损坏;3.结合面有缺陷

Reason: 1 Insufficient tightening force or eccentric tightening of bolts; 2. The gasket does not meet the requirements or the gasket is damaged; 3. The joint surface is defective

处理：1.重紧螺栓或使门盖法兰间隙一致;2.更换垫片;3.解体修研门盖密封面

Treatment: 1 Re tighten the bolts or make the gap between the door cover flanges consistent; 2. Replace the gasket; 3. Disassemble and repair the sealing surface of the door cover

四、阀门内漏：

4、 Valve internal leakage:

原因：1.关闭不严;2.结合面损伤;3.阀芯与阀杆间隙过大，造成阀芯下垂或接触不好;4.密封材料不良或阀芯卡涩。

Reason: 1 Lax closure; 2. Joint surface damage; 3. The clearance between the valve core and the valve stem is too large, causing the valve core to sag or poor contact; 4. The sealing material is poor or the valve core is jammed.

处理：1.改进操作，重新开启或关闭;2.阀门解体，阀芯、阀座密封面重新研磨;3.调整阀芯与阀杆间隙或更换阀瓣;4.阀门解体，卡涩;5.重新更换或堆焊密封圈

Treatment: 1 Improve operation and reopen or close; 2. Disassemble the valve and regrind the sealing surface of valve core and valve seat; 3. Adjust the clearance between the valve core and the valve stem or replace the valve disc; 4. Disassemble the valve and solve the jam; 5. Replace or weld the sealing ring again

五、阀芯与阀杆脱离，造成开关失灵:

5、 The valve core is separated from the valve stem, resulting in switch failure:

原因：1.修理不当;2.阀芯与阀杆结合处被腐蚀;3.开关用力过大，造成阀芯与阀杆结合处被损坏;4.阀芯止退垫片松脱、连接部位磨损

Reason: 1 Improper repair; 2. The joint of valve core and valve rod is corroded; 3. Excessive switching force causes damage to the joint between valve core and valve rod; 4. The valve core stop gasket is loose and the connecting parts are worn

处理：1.检修时注意检查;2.更换耐腐蚀材质的门杆;3.操作是不可暴力开关，或不可全开后继续开启阀门;4.检查更换损坏备品

Treatment: 1 Pay attention to inspection during maintenance; 2. Replace the door rod made of corrosion-resistant material; 3. Do not switch violently or continue to open the valve after fully opening; 4. Check and replace damaged spare parts

六、阀芯、阀座有裂纹：

6、 Cracks on valve core and valve seat:

原因：1.结合面堆焊质量差;2.阀门两侧温差大

Reason: 1 Poor surfacing quality of joint surface; 2. Large temperature difference on both sides of the valve

处理：对有裂纹处进行补焊，按规定进行热处理，车光、并研磨。

Treatment: repair welding shall be carried out for cracks, heat treatment shall be carried out according to regulations, polishing and grinding shall be carried out.

七、阀杆升降不灵或开关不动:

7、 The valve rod does not lift properly or the switch does not move:

原因：1.冷态时关得太紧受热后胀死或全开后太紧;2.填料压得过紧;3.阀杆间隙太小而胀死;4.阀杆与丝母配合过紧，或配合丝扣损坏;5.填料压盖压偏;6.门杆弯曲;7.介质温度过高，润滑不良，阀杆严重锈蚀

Reason: 1 It is closed too tightly in cold state and swells to death after being heated, or it is too tight after being fully opened; 2. The packing is pressed too tightly; 3. The valve stem clearance is too small and expands to death; 4. The fit between the valve rod and the screw nut is too tight, or the matching screw thread is damaged; 5. Packing gland pressure deviation; 6. The door rod is bent; 7. The medium temperature is too high, the lubrication is poor, and the valve rod is seriously rusted

处理：1.对阀体加热后用力缓慢试开或开足并紧时再稍关;2.稍松填料压盖后试开;3.适当加大阀杆间隙;4.更换阀杆与丝母;5.重新调整填料压盖螺栓;6.校直门杆或进行更换;7.门杆采用纯净石墨粉做润滑剂

Treatment: 1 After heating the valve body, try to open it slowly or close it slightly when it is fully opened and tightened; 2. Slightly loosen the packing gland and try to open it; 3. Properly increase the valve stem clearance; 4. Replace the valve rod and screw nut; 5. Readjust the packing gland bolts; 6. Straighten the door rod or replace it; 7. Pure graphite powder is used as lubricant for door rod

八、填料泄漏:

8、 Packing leakage:

原因：1.填料材质不对;2.填料压盖未压紧或压偏;3.加装填料的方法不对;4.阀杆表面损伤

Reason: 1 Wrong filler material; 2. The packing gland is not compressed or biased; 3. The method of adding filler is wrong; 4. Valve stem surface damage

处理：1.正确选择填料;2.检查并调整填料压盖，防止压偏;3.按正确的方法加装填料;4.修理或更换阀杆

Treatment: 1 Correct selection of filler; 2. Check and adjust the packing gland to prevent pressure deviation; 3. Add filler according to the correct method; 4. Repair or replace the valve stem

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The above is the knowledge brought to you today. Lianggong valve has focused on the industry for many years and continuously provides users with valuable content. Please continue to pay attention to us for more content: http://www.jnlgvf.com