闸阀是油(气)井口的主要部件，几种常见故障在使用中常见故障如下。1.首先，检查阀门与闸阀连接螺栓是否紧固，若不紧固，其密封圈与法兰密封槽面若连接不充分，往往会导致泄漏。检查螺栓和螺母，依次拧紧所有螺栓，直至压紧密封圈。第二、检查密封圈和法兰密封槽的表面尺寸和精度，如果密封接触面尺寸错误或太粗糙，要进行修复或更新。还要检查密封圈与法兰密封槽的接触面是否存在少许侵蚀、砂孔、砂孔或杂质等缺陷，如有，应进行相应的焊接、修补或清理。2.阀盖泄漏由阀盖泄漏引起，这种失效现象常发生在填料密封的泄漏上。首先，检查密封接头是否正确，是否适合密封槽，如果有这样的问题，更换密封圈或修复密封槽。第二，检查密封件是否有毛刺、断裂和扭曲，如果有，更换密封件。 Then, check if the surface of sealing groove seal is rough or have other defects, if there is a defect, eliminate the defects or update the damaged parts. Bonnet or scaffolds by compression seal packing, should check the installation of the packing case, if find packing installed upside down, should remove, carry out in accordance with the correct way to install. Pay special attention to the surface of packing seal joint. Finally, check if the precision of the contact surface of seal fittings meet the requirements. 3. Leakage from valve body cavity In the process of casting, sometimes valve body may appear casting defects, such as sand holes, sand hole. Although it is difficult to find in the process of machining, once the pressure put on the valve body, hidden casting defects will be exposed. If there is this kind of situation, welding, repairing or updating it. 4. Leakage from valve seat and valve plate Leakage occurs in valve seat and plate, which is the most common phenomenon among the installation or maintenance of gate valves. Generally this can be divided into two kinds: one is leaking in seal surface; the other is leaking in seal root. Above all, check the seat and the precision of the sealing contact surface of valve plate. The sealing surface needs grinding, if there is rough surface, remove and grind it again. Second, check whether there are pitting, indentation, sand holes, cracks and other defects the sealing surface, if in this case, replace valve seat and valve plate. For the valve seat with compression spring, should check whether the pressure spring elasticity is conform to the requirements, if less resilient, update the compression spring. Besides, check if T-shape coupling place of valve plate and valve ste...