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Knife gate valve common troubleshooting
First, the knife-type gate valve closure Leakage: Leakage is usually called leakage of stuffing box, the closure of the leak is called leakage, the closure of the leak, in the valve where, not easy to find. Closure pieces can be divided into two categories; one is the sealing surface leakage; the other is the root seal leakage. Leakage caused by the reasons: 1, knife-type valve sealing surface grinding is not good; 2, the seal ring and the valve seat, the valve does not cooperate with the tight; 3, valve stem and stem connection is not solid; 4, So that the upper and lower closure is not aligned; 5, close too fast, the seal surface contact is not good or has long been damaged; 6, improper selection of materials, can withstand the corrosion of the medium; 7, the stop valve, gate valve for regulating the use of sealing surface withstand Live in the impact of high-speed flow medium; 8, some of the media, the valve is closed and gradually cooled, so that the sealing surface slippage, will produce erosion phenomenon; 9, some seals and valve seats, 10, due to welding slag, rust, dust and other impurities embedded, or the production of the system has a separate piece of mechanical plug off the spool, so that the knife-type gate valve can not be closed tightly. Second, the knife gate valve stuffing box leakage: 1, the filler and the working medium corrosive, temperature and pressure do not meet; 2, filling method is wrong, especially the whole root filler spin-on, the most prone to leakage; 3, the valve Rod machining accuracy or surface finish is not enough, or oval or scored; 4, the valve stem pitting has occurred, or due to lack of protection of the open rust; 5, the valve stem bending; 6, the filler has been used for too long has been aging . 7, the operation is too fierce. Third, the valve stem lift failure: 1, the operation too much to make the thread damage; 2, the lack of lubricant or lubricant failure; 3, stem bending and torsion; 4, the surface finish is not enough; Such as stem and stem nut for the same material, easy to bite; 8, threaded wave media corrosion (refer to the dark rod valve or stem in the lower part of the valve ); 9, the lack of protection of open valves, stem thread sticky dust, or rain and snow rust. Fourth, the other: 1, body cracking: generally caused by freezing. When it is cold, knife-type gate valve must have thermal tracing measures. 2, hand wheel damage: impact or long lever violent operation. As long as the operator or other relevant personnel pay attention, can be avoided. 3, packing gland rupture: pressing force uneven packing, or gland defects. Compacted packing, to be symmetrical to rotate the screw, not skewed. Manufacture should not only pay attention to large and key parts, but also pay attention to gland and other minor parts, otherwise affect the use. 4, stem and gate connection failure: knife gate valve stem rectangular head and gate T-slot connection in the form of T-slot sometimes not processed, so that the stem square head wear faster. Mainly from the manufacturing side to solve. But the use of units can also be T-slot for additional work, so she has a certain finish.