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 of the process parameters such as the final control element. 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 valve; 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 in use process will appear some problem, how to avoid these failures occur, we'll look at. 1, the cleaning method: pipeline welding slag, rust, pulp are under the throttle mouth, guiding parts, valve cover balance hole blockage or stuck valve core surface, guide surface strain and scratches, seal surface indentation, etc. This often happens in the early new operation system and put into operation after overhaul. This is a common fault zui. Encounter this situation, it is necessary to remove for cleaning, remove the slag content, such as the sealing surface damage should also grinding; At the same time open the bottom plug to flush out from under the balance hole fall into the residue inside the valve cover, and the pipeline to wash. Before put into operation, let the valve fully open, the medium flows into normal operation again after a period of time. 2, external flushing method: for some easy to precipitate, medium containing solid particles using ordinary valve adjustment, often at the throttle mouth jam, guide, can the cover bottom plug in an external erosion gas and steam. When the valve is blocked or jammed, open an external gas or steam valve, can be completed in under the condition of fixed regulator flush work, make the normal operation of valve. 3, install pipeline filter method: regulating valve of small diameter, especially ultra-small flow regulating valve, the throttling clearance, small, medium can't have a little residue. Encounter this jam, installation of a strainer before Industrial Valves line, to ensure that the media to go through. Take use of regulating valve locator, locator is not normal work, the pneumatic throttle mouth blockage is zui common fault. With locator at work, therefore, must deal with gas source, usually adopts the way is in front of the locator air pipe installed on the air filtering pressure reducing valve. 4, increase the throttle clearance method: such as solid particles in the medium or washed off in pipe welding slag and rust due to pass the throttle mouth such as jam, jam, such as fault, can convert the throttle gap bigger throttle piece - Throttling area of a window, open the valve core and the sleeve, rather than the circumference of a circle because of the throttling area of concentration distribution, fault can easily be ruled out. If you are single, two-seat valves can change the plunger valve core form to 'V' shape of valve core, or into a sleeve valve, etc. Such as a chemical plant has a two-seat valves often gets stuck, recommend to switch to the sleeve valve, problem be solved immediately. 5, medium washed law: using medium their energy scour, erosion, and take things easy to precipitate, easy to jam, thus improve the function of valve stem. Common methods include: (1) flow into closed type use; (2) adopts streamlined body; (3) puts throttling mouth wash more severe, adopted should pay attention to improve the throttling parts material erosion resistant ability.
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