Electric control valve leaked Why would it? This is what causes it? And how to solve it? Here to tell us about.
1> increased seal grease, this is by electric control valve not sealed grease, consider increasing the sealing grease to improve the performance of the stem seal.
2> to increase the packing method, to improve the sealing performance of the filler material of the valve stem, can be used to increase filler. Usually double-layer, multi-layer hybrid filler form, simply increasing the number, such as 3 increased to 5, the effect is not obvious.
3> replace the graphite packing, PTFE packing a lot of use, because of its working temperature range of -20 ~ 200 ℃, when the temperature in the upper and lower limits, change is large, the tightness will significantly decline, aging, life short. Flexible graphite filler can overcome these shortcomings and long service life. Thus some factories all PTFE packing changed to graphite packing, and even new repurchase regulating valve filler which tetrafluoroethylene replaced after graphite packing. The graphite packing back large difference initially a creeping phenomenon, this must have taken into account.
4> change the flow of the set P2 at the stem end, when larger △ P, P1 and large, sealed P1 is clearly better than the sealed P2 difficult. Therefore, can be taken to change the flow of the method, P1 at the stem end to P2 at the stem end, and this to the high pressure, a large pressure difference of the valve is more effective as the bellows valve should normally consider sealing P2.
5> using the lens pad seal method, the upper and lower cover seal, the valve seat and the upper and lower valve body seal. For planar sealing at high temperature and under high pressure, the seal is poor, causing leakage, can switch the lens pad seal to get satisfactory results.
6> replace the sealing gasket, so far, most of the gasket still using asbestos board, at high temperatures, the sealing performance is poor, and also short-lived, can lead to leakage. In such cases, could be replaced by the spiral wound gasket, "O" rings, many factory has been adopted.
Therefore, to remind: we can be more than several methods to solve the electric control valve leakage problem.
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