Regulating valve and control valve, in the field of industrial automation process control, by accepting conditioning control unit of the output control signal, from engine operation to change the medium flow rate, pressure, temperature, liquid level control all process parameters, such as components. And valve general, the executing agency. If the trip characteristics of regulating valve can be divided into straight stroke and stroke; By their ticket enforcement agencies use the power, can be divided into pneumatic control valve, electric valve, hydraulic control Industrial Valves; According to its functions and features are divided into linear features, such as percentage and parabolic characteristics of three. Regulator is applicable to air, water, steam, all kinds of corrosive medium, mud, oil, etc. Regulating valve leakage fault processing method: 1, increase sealing grease method: Industrial Valves of unused sealing grease, can consider to increase the sealing grease to improve stem seal performance. 2, increase the packing method: to improve the packing of the Industrial Valves 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, replace graphite packing method: 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, the lens gasket sealing method: 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. 5, change the sealing gasket: so far, most of the 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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