Why don't speed driving speed switch valve shut? Quick opening and closing of the valve in the line with will generate water hammer phenomenon, at the section close to the valve a water hammer pressure value. According to the calculation, pipeline fluid velocity changes every 1 m/s, liquid pressure value can reach 1 MPa, so the pressure value is not only in the form of surge wave by close to the section of the valve to close to the speed of sound velocity upstream transmission ( The speed of sound in water is 1500 m/s, the rate of 1100 m/s) in the gasoline And at various points along the pipeline to its original stress superposition, could reach the extent of the pipeline rupture. Slow and gradual open and close the Industrial Valves, because in the transient time, velocity changes little, produced by the initial pressure value is small, and since the extension of time, the surge wave propagated to the upstream, and produces a reflected wave, so as to offset the early water hammer pressure, thus avoiding the accidents overpressure. The methods of dealing with the valve closed lax? 1) Reason: medium with sundry, solid particles cushion between disc and seat. Stem and disc connection is not good, and the valve seat valve deflection cannot close contact. 2) Processing method: to ensure that the medium is clean, close the Industrial Valves when when the disc has a mat plug phenomenon is found, not force, quickly switch can be used several times, so the plug out. Often add lubricant to the stem and stem nut, ensure that the valve switch is quick. The valve to open it, don't shut the cause and the treatment method is what? 我) Reason: between the stem and stem nut have sundry or mesh, from the stem and disc, the valve stem and valve stem nut rusting, disc force is too large and too tightly on the packing. 2) Processing method: often lubrication to the stem and stem nut and remove impurities; Stem and disc out, overhauling should; Force is too large, the disc after the decompression valve opening.
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