Five Tips for Leakage Treatment of Electric Regulating Valve
The first method is to add sealing grease, which is aimed at the valve body that has not yet used sealing grease. It can be considered to increase sealing grease to improve the sealing performance of the valve stem. It is also one of the necessary maintenance procedures to add additional sealing grease when maintaining the electric control valve.
The second method is to change the direction of flow and put P2 at the stem end. When P is bigger and P1 is bigger, it is obviously more difficult to seal P1 than seal P2. Therefore, the electric control valve can adopt the method of changing the direction of flow to change P1 at the stem end to P2 at the stem end, which is more effective for valves with high pressure and large pressure difference. For example, the bellows valve should usually consider sealing P2.
Method 3: Use lens pad sealing method; for the sealing of upper and lower cover, the sealing of valve seat and upper and lower body. If it is plane seal, under high temperature and high pressure, the sealing performance is poor and causes leakage, the lens pad seal of electric control valve can be used instead, and satisfactory results can be obtained.
Method 4: Increase packing method; usually use double or multi-layer mixed packing to simply increase the number of sealing gaskets, such as increasing three to five, to improve the sealing performance of the stem, but the leakage prevention effect of the electric control valve is not obvious.
Fifth, the method of replacing graphite filler is adopted. A large number of 4** fillers are used. The suitable working temperature is in the range of - 20 - 200 C. When the working temperature changes greatly in the upper and lower limits, the sealing performance of the electric control valve decreases obviously, and the aging is fast and the service life is short. It is recommended that flexible graphite filler be used to overcome the difficulties that the filler can not withstand, and the service life is long, so as to improve the reliability of the seal. Many factories have replaced all four ** fillers with graphite fillers, and even the newly purchased regulating valves have replaced the four ** fillers with graphite fillers for use. However, graphite packing also has a disadvantage, that is, the backlash is large, and sometimes there are crawling phenomenon. In this regard, manufacturers and users should also consider when designing and installing electric control valve equipment.
Above is the solution to the leakage phenomenon of the electric control valve. If you want to know more about the consultation of the electric control valve, you can continue with other contents.