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Solution to the leakage fault of the regulating valve

2021-10-23 02:17:54
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1) Add sealing grease method
For valves that do not use sealing grease, adding sealing grease can be considered to improve the sealing performance of the valve stem.
2) Adding filler method
To improve the sealing performance of the packing on the valve stem, the method of adding packing can be adopted. Usually, double or multi-layer mixed fillers are used, and simply increasing the quantity, such as increasing 3 to 5 pieces, does not have a significant effect.
3) Replacing graphite packing method
The widely used tetrafluoro filler, due to its working temperature range of -20~+200 ℃, significantly reduces its sealing performance, aging quickly, and has a short lifespan when the temperature changes significantly between the upper and lower limits. Flexible graphite fillers can overcome these shortcomings and have a long service life. Therefore, some factories have completely changed the PTFE packing to graphite packing, and even newly purchased control valves have replaced the PTFE packing with graphite packing for use. (Recommended by valve manufacturer: Shandong Guowei Valve Manufacturing Co., Ltd.) However, the use of graphite packing has a large return difference, and some may even experience crawling at the beginning, which must be considered.

Electric butterfly valve

4) Change the flow direction and place P2 at the valve stem end
When Δ P is large and P1 is also large, sealing P1 is clearly more difficult than sealing P2. Therefore, the method of changing the flow direction can be adopted, changing P1 from P2 at the valve stem end to P2 at the valve stem end, which is more effective for valves with high pressure and large pressure difference. For bellows valves, sealing P2 should usually be considered.
5) Using lens pad sealing method
For the sealing of the upper and lower covers, the sealing of the valve seat and the upper and lower valve bodies. If it is a flat seal, under high temperature and pressure, the sealing performance is poor, causing leakage. It can be replaced with a lens gasket seal to achieve satisfactory results.
6) Replace the sealing gasket
Until now, most sealing gaskets still use asbestos sheets, which have poor sealing performance and short lifespan at high temperatures, leading to leakage. In this situation, spiral wound gaskets, "O" rings, etc. can be used instead, and many factories have now adopted them.
Disclaimer: This article is reproduced online for reference only!

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