Valves and other mechanical products, is also need maintenance. The job well done, can prolong the service life of the valve, the following will introduce the valve maintenance. 1, valves for the custody of the custody, is to keep the valve in the custody of the damage, or lower quality. In fact, improper safekeeping is one of the important reasons for the damage. , should be in good order, small valve on top of the shelf, large valves can be lined up on the ground in the warehouse, not heap crib, don't let the flange junction surface contact with the ground. This in order to not only beautiful, mainly is to protect the valve is not damaged. The hand wheel broken because of improper storage and handling, the valve stem touch tilt, the handwheel and fixed stem nut loose loss, and so on, these unnecessary losses, should be avoided. To not use the valve in the short term, we should remove the asbestos packing, lest produce electrochemical corrosion, damage to the valve stem. Just into the library for the valve to check, such as in the process of transportation into the rain water or dirt, try to wipe clean, then to the store. Import and export with wax paper or plastic seal, valve into the dirt in case. To be rusty in the atmosphere valve machining surface to tu rust-proof oil, to protect it. Placed outside the valve, must cover the linoleum or tarpaulin items such as rain, dust. The warehouse where the valve to keep clean and dry. 2, valve used in operation and maintenance, the purpose of maintenance is to prolong the life of the valve and assure reliable opening and closing. Stem thread, often with stem nut friction, to apply p redictors oil, molybdenum disulfide or graphite powder, lubrication. Don't often open/close the valve, but also to turn the handwheel, regularly add lubricant to the valve stem threads, in case of biting. Outdoor valves, to be on the valve stem and cases, in case of rain, snow, dust tarnishing. Such as mechanical valve system to move, to add lubricating oil for transmission on time. Always keep the valve is clean. To regularly check and maintain the valve parts integrity. Such as hand wheel fixed nut off, should be used to match neat, can't do, otherwise you will grind garden stem top four sides, gradually lose with reliability, and can't start. Don't rely on the valve support other heavy things, don't stand on the valve. Stem, especially the threaded portion, often should wipe, to have been the dust dirty lubricant to switch to the new, because the hard stuff is contained in the dust, easy to wear thread and stem surface, affect the service life. 3, valve packing maintenance valve switch whether has a close relationship with key seal leakage, if the packing failure, cause leakage, the valve is equal to failure, especially urea pipeline valve, due to its high temperature corrosion is interested, packing easy ageing. Strengthen maintenance can prolong the life of the packing. in the factory, in order to ensure that the elasticity of the packing, generally will be subject to under the static pressure test does not leak. in pipeline, because of factors such as temperature, extravasation, could occur at this time will be in time to tighten the packing gland on both sides of the nut, as long as where it can, will appear later exosmosis tight again, don't close to death at a time, in order to avoid the packing lose elasticity, loss of sealing performance. Some valves equipped with mos2 lubricating grease in the packing, when using a few months later, should be in time to join the corresponding grease, when found the packing need to be supplemented, should increase the corresponding packing in time, in order to ensure the sealing performance. 4, transmission parts to maintain the valve in the process of switch, the original add lubricating oil will continue to loss, plus the role of temperature, corrosion and other factors, also can make lubricating oil in dry up. Therefore, the part should be regularly check valve, found that the lack of oil should be timely add, just in case because of a lack of lubricant and increase the wear and tear, damage or stuck not flexible transmission failure such as 5 greasing the maintenance of the valve, the valve greasing, often ignore the problem on the quantity. Note grease gun after lubrication, the operating personnel selection valves and greasing connection, on the operations. There are two kinds of circumstances: on the one hand, on the quantity is little greasing, sealing surface due to the lack of lubricant and speed up the wear and tear. On the other hand on the excessive, resulting in waste. Is no categories depending on the type of valve, valve sealing capacity of different calculations. Can work out seal to the valve size and class capacity, then the reasonable injection amount of grease. Often ignore the pressure valve on the problem. In the greasing operation, on the pressure changes regularly with peak valley. Pressure is too low, seal leakage or failure, the pressure is too high, greasing the jams, seal inside lipid hardening or sealing ring and valve ball, valve plate lock. Usually fat injection pressure too low, injecting grease into the valve at the bottom of the cavity, more commonly occur in small gate valves. And fat injection pressure is too high, on the one hand, to check on the mouth, so fat pore blocking determine to change the situation; Is lipid hardening on the other hand, to use cleaning fluids, repeated failure sealing grease of softening, and inject new replacement grease. In addition, sealing type and sealing material, also influence on the pressure, different seal forms have different fat injection pressure, usually hard seal fat injection pressure is higher than the soft seal. on the: (1) attention to the problem of valve in the switch position. Generally ball valve maintenance in an open state, under special circumstances to choose shut down maintenance. Other valves are not all in open position. Gate valves must be closed during maintenance, to ensure the sealing ring is full of grease seal grooves, if open, sealing grease directly off the inflow, or valve cavity, wasteful.
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