Type knife gate valve closed a leak: usually the stuffing box leak leakage, called closed a leak leakage, closed a leak, in in the valve, it is not easy to find. Close a leak, can be divided into two categories; One kind is leak sealing surface; Another kind is the root of the seal leakage. The causes of leakage are: 1, knife gate valve sealing surface grinding well; 2, sealing ring and valve seat and valve do cooperate not strictly; 3, valve connected to the valve stem is not strong; 4, the valve stem bend torsion, make up and shut down a wrong; 5, shut down too fast, bad sealing surface contact or already damaged; 6, improper material selection, cannot endure the corrosion of the medium; 7, will make an adjustment using cut-off valve, gate valve, sealing surface withstand the impact of the high-speed flow medium; 8, some medium, cooling after valve is closed, the seal face in thin seam, also produces erosion phenomenon; 9, some sealing ring and Industrial Valves seat, valve between the threaded connection, easy to produce oxygen concentration cell, loose corrosion; 10, due to the welding slag, rust, dust and other impurities embedded, fall off or mechanical parts in the production system block valve core, which type knife gate Industrial Valves cannot be locked. Type knife gate valve gland leakage: 1, the packing and working medium corrosion resistance, temperature, pressure does not adapt, 2, packing method is wrong, especially the whole root spare screw into the packing, the most easily produce leakage; 3, valve rod machining precision and surface finish is not enough, or have ovality, or have a notch; 4, the valve stem pitting corrosion has occurred, or due to a lack of protection in the open air and rust; 5, the valve stem bending; 6, packing used for too long has been aging. 7, the operation is too fierce. Three, type knife gate valve stem lift failure: 1, the operation is too hard to make thread damage; 2, lack of lubricant or lubricant failure; 3, stem bend torsion; 4, surface finish is not enough; 5, fit tolerance, biting too tight; 6, stem nut tilt; 7, improper material selection; Such as the stem and stem nut for the same material, easy to bite; 8, thread wave medium corrosion ( Refers to the non-rising stem valves or valve stem on the bottom) ; 9 the lack of protection, open valve, the valve stem threads with dust sand, or corroded by rain and dew frost and snow, etc. 4, other: 1, the body cracking: general is caused by freezing. When the day is cold, type knife gate valves should have heat preservation heat tracing measures. 2, the handwheel damage: caused by impact or long leverage against the operation. As long as the operating personnel or other related personnel pay attention to, can be avoided. 3, breakage of packing gland: compression strength uneven when packing, or gland defects. Compress packing to symmetrically rotary screw, not twisted. Manufacture should not only pay attention to the bulk and key-module, also pay attention to the gland elements such as time, otherwise affect use. : 4, the valve stem and disc connection failure type knife gate Industrial Valves made stem oblong head more, with the gate T slot connection within the t-slot sometimes not processing, so that the valve stem oblong head wear quickly. Mainly from the aspects of manufacture to solve. But use the unit can also be to fill T line groove processing, let her have some finish.
The global market was valued at resilient seal gate valve in y gate valve and is expected to reach a market value of os gate valve by resilient seated valve, with a CAGR of os&y valve during the forecast period.
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