Basic maintenance of valves

1. The valve should be kept dry and ventilated room, both ends of the access to be blocked.

2. Long-term storage of the valve should be checked regularly to remove dirt and machining surface coated with anti-rust oil.

3. After installation, periodic inspection, the main test items:

(1) sealing surface wear. (2) stem and stem nut trapezoidal thread wear. (3) packing Obsolescence failure, should be replaced if damaged (4) valve repair assembly, the sealing performance test should be carried out

Before production and post-production of professional valve maintenance work prior to welding, the valve service in manufacturing operations plays a vital role in the proper and orderly and effective maintenance will protect the valve, the valve to function properly and to extend the use of the valve life. Valve maintenance work may seem simple, it is not. Work often neglected aspect.

1, the valve greasing, the grease quantity is often overlooked problem. After greasing refueling, the operator selects the valve and coupling greasing the way, were greasing operation. There are two cases: one injection insufficient greasing less grease, sealing surface due to lack of lubricant accelerate wear. On the other hand excess grease, resulting in waste. That there is no regulator valve according to the type of category for different valve sealing capacity for precise calculations. Can be calculated valve size and sealing capacity category, and then injected into a reasonable amount of grease.

2, valve grease, often ignore the problem of pressure. In operation grease, grease pressure regularly showed peak changes. Pressure is too low, seal leakage or failure, the pressure is too high, the grease port plug, sealed lipid hardening or seal with the valve ball, valve plate locking. Typically grease pressure is too low, the grease inject more into the bottom of the valve chamber, generally occurs in a small gate. The grease pressure is too high, on the one hand to check the grease mouth, hole blocking ascertain the situation in the case fat replacement; on the other hand is a lipid hardening, to use cleaning fluid, repeated failure to soften the seal fat, and inject new grease replacement . In addition, the seal type and sealing materials, also affected the grease pressure, different forms have different sealing resin injection pressure, in general, hard seal grease pressure is higher than the soft seal.

3，the valve greasing, note the position switch valve in question. When valve maintenance is generally in the open position state, choose to close maintenance under special circumstances. Other valves in the open position can not always be punished. Gate when conservation must be turned off to ensure full of grease along the ring seal grooves, if the open position, sealing grease directly fall into the flow channel or valve chamber, resulting in waste.

4, the valve grease, often ignore the grease performance issues. Operating pressure grease, grease, switch position 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 surface lubricity evenly.

5, grease, pay attention to body drain plugs and pressure relief problems. After the pressure test valve, the valve chamber sealed chamber gas and water due to environmental temperature and boost, to conduct the sewage grease relief when, in order to facilitate the smooth progress of grease injection work. After greasing air and moisture sealed chamber is sufficiently displace. Timely vent valve cavity pressure off, but also to protect the use of safety valves. After greasing, be sure to tighten the wire blocking the sewage and pressure relief, to prevent accidents.

6, grease, pay attention to the problem of fat evenly. Normal grease from grease port hole nearest the fat out of fat first, and then to a low point, and finally the high point, successive out fat. If you do not follow the law or no fat, prove the existence of plug, clean through timely treatment.

7, we must observe the valve size and seat ring flush problems greasing. Such as ball valves, open position if there is interference, can be adjusted to the stopper in the open position, the lock confirmation straight path. Adjust the limit should not only seek one position on or off, to consider the overall. If the open position flush, customs are not in place, it will cause the valve closed lax. Similarly, adjust the clearance in place, but also consider open position accordingly. Ensure the right angle valve stroke.

brass air vent valve-705/release valve

8, after greasing, some seal grease port. Avoid impurities entering, or greasing mouth lipid oxidation, capping to apply anti-rust grease to avoid rusting. To apply when the next operation.

9, grease, it should also be considered in the future delivery of oil in order to treat specific issues. In view of the different quality of gasoline and diesel should be considered erosion and decomposition gasoline. When the valve after the operation, encountered gas segment operations, replenish grease to prevent wear from happening.

10, grease, do not ignore the stem portion of greasing. Sliding sleeve valve shaft portion or filler, and the need to maintain lubrication to reduce friction during operation, if they can not ensure the torque increase lubrication and wear parts, the electric operation, switch laborious manual operation.

11, some marked with an arrow on the valve body, if not accompanied by an English FIOW writing, for the sealing seat role in the direction, not as a reference medium flow, since the vent valve in the opposite direction. Typically, two-seater with two-way flow valve seal.

12, valve maintenance, and also pay attention to the electric actuator head in water issues. Especially in the rainy season, rainwater infiltration. First, make the actuator shaft sleeve or rust, and second, the winter freeze. When the electric valve operating torque causing excessive damage to transmission components cause the motor torque load or super jump can not be achieved to protect electric operation. Damage to transmission parts, can not be performed manually. After the super torque protection action, it is also unable to manually switch, such as the forced operation, damage to the internal parts alloy.

To sum up, the valve maintenance To correct attitude in order to achieve the purpose of the valve maintenance and application of the desired effect.