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大批量生产液压换向阀和调速阀的工厂,最感困难的是精密阀孔的加工。为使拖拉机和农机液压系统中的油压提高至180～200kgf/cm~2,(为了减少液压系统的外廓尺寸和减轻它的重量),这就必须要求将阀芯—阀孔副的间隙减小至6～9μ,孔的形状误差(圆柱度,圆度和母线直线度)不应超过1～2μ,较大的误差将使阀芯运动不灵活,另外不均匀的热变形和微小颗粒的跌入,甚至会卡住阀
High-volume production of hydraulic valve and speed control valve factory, the most difficult is the precision valve hole processing. In order to increase the hydraulic pressure in tractor and agricultural hydraulic system to 180 ~ 200kgf / cm ~ 2 (in order to reduce the size of the hydraulic system and reduce its weight), this must require the spool - valve clearance Reduced to 6 ~ 9μ, hole shape error (cylindricity, roundness and generatrix straightness) should not exceed 1 ~ 2μ, a larger error will make the spool movement is not flexible, in addition to uneven thermal deformation and tiny particles Drop in, or even stuck the valve