Pressure control Industrial Valves or valve. Its basic function is to control the hydraulic system pressure or use as a signal to the control action of other components. According to the function can be divided into the overflow valve, relief valve, sequence valve, pressure relays, etc. Role in common is: use on the valve core of fluid pressure and spring force balance control. Pressure valve is a common cause of failure: agricultural machinery hydraulic system, the pressure valve is a type of the element, apply more pressure valve sudden failure will directly affect the normal operation of the machinery and equipment, this paper points the reason of the pressure Industrial Valves failure. ( 1) Hydraulic valve core and valve body is constantly produced when use wear, makes parts change size, shape and surface quality. ( 2) Balance of hydraulic valve spring, Industrial Valves core and valve seat, in the long-term work under variable load, fatigue and cracks, spring and seat sealing surface spalling, broken or damaged. ( 3) In the process of the hydraulic valve parts processing in the process of using the residual stress and residual load stress, more than the yield strength of material, parts parts deformation. ( 4) In the hydraulic oil mixed with water or too much acid, after using a long time, the corrosion of hydraulic valve parts, make its loss of accuracy. ( 5) core and valve suite of unbalanced radial force, eventually make the valve core pressure to the valve set inside wall appear clamping phenomenon. ( 6) When hydraulic valve manufacture or repair, did not meet the technical requirements; Improper safekeeping or parts, corrosion, mixed with dirt and so on.
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