Proper and orderly and effective maintenance will protect the valve, the valve to function properly and extend valve life. Valve maintenance work may seem simple, it is not. Work often neglected aspect. First, when the valve grease, grease quantity often overlooked issue. After refueling grease gun, after the operator selects valves and grease coupling means, the greasing operation. There are two cases: one less injection insufficient grease grease sealing surface due to lack of lubricant and accelerate wear. On the other hand greasing excessive wastage. According to the type of valve that there is no category for different valve sealing capacity for accurate calculations. Valve size and type can be calculated from the sealing capacity, and then injected into a reasonable amount of grease. Second, the valve greasing, often ignoring the problem of stress. In greasing operation, greasing peak pressure was regularly changed. Pressure is too low, seal leakage or failure, the pressure is too high, greasing mouth clogged, hardened or sealed lipid ring and ball valve, the valve plate locking. Typically grease pressure is too low, inject more grease into the bottom of the valve chamber, generally occurs in a small gate. The grease pressure is too high, while greasing nozzle check, and if so fat hole blocking ascertain the situation to be replaced; on the other hand is a lipid sclerosis, to use cleaning fluid, repeated failure of the sealant to soften and inject new grease replacement . In addition, the seal type and sealing materials, but also affect the grease pressure, different sealing forms have different greasing pressure, generally hard seal grease pressure is higher than the soft seal. Third, the valve greasing, note the valve in question switch position. When the valve maintenance are generally in the open position status, select Close maintenance under special circumstances. Other valves in the open position can not always be punished. When the valve is in the closed state of conservation, you must make sure the seal is full of grease along the ring groove, if the open position, sealant directly fall into the flow channel or valve chamber, resulting in waste. Fourth, the valve greasing, often ignored greasing effect problems. Greasing operation pressure, greasing, switch bits are normal. However, to ensure that the valve greasing effect, and sometimes need to open or close the valve, for lubrication check to make sure the valve ball or gate valve lubrication surface evenly. Fifth, grease, pay attention to the pressure relief valve discharge and wire blocking problem. After the pressure test valve, the valve chamber sealed chamber gas and water due to environmental temperature and boost, to conduct relief when sewage grease, grease in order to facilitate the smooth working of the note. After greasing air and water seal chamber is sufficient to displace. Timely leak out of the valve chamber pressure, but also to protect the use of safety valves. After greasing, be sure to tighten emissions and relief plugs, to prevent accidents. Sixth, grease, pay attention to the problem of fat evenly. Normal grease from grease port nearest the fat out of fat hole first, then to the lows of the last high point, successive out fat. If you do not follow the law or no fat, prove the existence of congestion, clear through timely treatment. Seventh, we must observe the valve seat ring diameter and flush problems greasing. Such as ball valves, open position if there is interference, can be adjusted to the stopper in the open position, confirm the path straight locks. Adjust the limit not only the pursuit of either open or closed position, to be considered as a whole. If the open position flush off is not in place, it will cause the valve closed lax. Similarly, the adjustment off place, but also consider the open position accordingly. Ensure the right angle valve stroke. Eighth, after greasing, some sealed grease port. Avoid impurities entering, or greasing mouth lipid oxidation, rust-proof cover to smear grease to avoid rusting. When applied to the next operation. Ninth, grease, they should also be considered in the future delivery of oil in order to treat specific issues. Given the quality of diesel and petrol should be considered erosion and decomposition gasoline. After the valve operation when encountered petrol segment operations, replenish grease to prevent wear from happening. Tenth, grease, do not ignore the stem part of the grease. Sliding sleeve valve shaft parts or fillers, also need to maintain lubrication to reduce friction when operating, if not ensure torque increase lubrication and wear parts, the electric operation, switch laborious manual operation. Eleventh, some ball valve marked with an arrow, if not accompanied by English FIOW writing, direction, compared with the seal seat role, not as a medium flow reference, since vent valve in the opposite direction. Typically, two-seater with two-way flow valve seals. XII, valve maintenance, but also pay attention to the head and electric water problem in the transmission mechanism. Especially during the rainy season rain infiltration. First, the shaft sleeve make transmission or rust, two winter freeze. When electric valve operating torque caused excessive damage to transmission parts cause the motor load or torque protection tripped over electric operation can not be achieved. Damage to transmission parts, manual operation can not be performed. After the super torque protection action, also can not be manually operated switch, such as the forced operation, damage to the internal alloy components. In summary, the valve maintenance truly scientific attitude in order to achieve the purpose of the valve maintenance and application of the desired effect. 

keywords: Valves, Jiangsu Lan valves, valve maintenance,