1) Increase of unused sealing grease valve sealing grease method, can consider to increase the sealing grease to improve stem seal performance. 2) Increase the packing method to improve the packing of the valve stem seal performance, can be used to increase packing method. Usually adopt double, multi-layer mixed packing form, simply increasing the number, such as between 3 to 5 pieces, the effect is not obvious. 3) Replacement of graphite packing method of extensive use of ptfe packing, because of its work in - 20 ~ + 200 ℃ temperature range, when the temperature, lower limit, change is bigger, its sealing is markedly reduced, aging fast, short service life. Flexible graphite packing can overcome these shortcomings and long service life. Therefore some factory all change the ptfe packing to graphite packing, even new to buy back the regulator will also be one of the four fluorine used after packing into graphite packing. But using graphite packing return difference is big, the early some still produce the crawling phenomenon, which must be considered. 4) Change flow direction, P2 on the stem end when the delta P method is larger, P1 and large seal P1 obviously difficult than seal P2. Can take change flow direction method, therefore, will be P1 to P2 on the stem end on the stem end, the high pressure, differential pressure valve is more effective. Usually should be considered as bellows Industrial Valves seal P2. 5) Lens gasket sealing method is used for the lid of the upper and lower sealing, sealing seat and the upper and lower body. If the plane sealing, under high temperature and high pressure, the sealing is poor, cause leakage, can use lens gasket seal, can get satisfactory results. 6) Most replacement of sealing gasket, sealing gasket is still use the asbestos board, at high temperatures, sealed performance is poor, life is short, cause leaks. Encounter this kind of circumstance, can convert wound gaskets, such as 'O' ring, now many plants have been used.
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