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七十年代以来,西德Rexroth公司一直大量生产2FRM5型(5通径)微型调速阀系列产品。由于该类型阀具有较全面的高性能指标,如使用压力范围高,可满足小至10毫升/分的稳定流量要求,油温变动影响微小,加之结构紧凑,性能可靠、造型美观,故产品畅销国际市场,得到各国厂家的广泛采用和良好评价。但是,这种旧型号的微型调速阀看来存有两方面的明显不足,一是安装尺寸不符合ISO国际标准规定;二是阀的背压力变化对通过流量的稳定性影响较大,特别是在中、高压(p>100公斤力/厘米~2)的工况下使用,此缺陷倍加突出,要在原结构基础上改进以求根本克服,则难度既大而收效甚微。
Since the 1970s, West Germany Rexroth company has been mass-produced 2FRM5 (5-way) miniature speed control valve products. Because this type of valve has a more comprehensive high-performance indicators, such as the use of high pressure range to meet the steady flow requirements of as little as 10 ml / min, little change in oil temperature, combined with compact structure, reliable performance, attractive appearance, so the best-selling products The international market, has been widely adopted by all manufacturers and a good evaluation. However, this old model of the micro-speed control valve appears to have two obvious shortcomings, first, the installation size does not meet the ISO international standards; the second is the valve back pressure changes on the flow through the greater stability, especially It is used under medium and high pressure (p> 100 kgf / cm ~ 2). This defect is more prominent. It is necessary to improve on the basis of the original structure so as to overcome it fundamentally.