D41FHE01C5NB00 PARKER伺服比例阀/派克比例阀

PARKER伺服比例阀其实缺点极多：能耗浪费大、容易出故障、抗污染能力差、价格昂贵等等等等，好处只有一个：动态性能是所有液压阀中Z高的。就凭着这一个优点，在很多对动态特性要求高的场合不得不使用伺服阀，如飞机火箭的舵机控制、汽轮机调速等等。动态要求低一点的，基本上都是比例阀的天下了。一般说来，好像伺服系统都是闭环控制，比例多用于开环控制；其次比例阀类型要多，有比例压力、流量控制阀等，控制比伺服药灵活一些。从他们内部结构看，伺服阀多是零遮盖，比例阀则有一定的死区，控制精度要低，向应要慢。但从发展趋势看，特别在比例方向流量控制阀和伺服阀方面，两者性能差别逐渐在缩小，另外比例阀的成本比伺服阀要低许多，抗污染能力也强！

PARKER派克伺服阀的区别主要体现在以下几点：1.驱动装置不同。比例阀的驱动装置是比例电磁铁；伺服阀的驱动装置是力马达或力矩马达；2.性能参数不同。滞环、中位死区、频宽、过滤精度等特性不同，因此应用场合不同，伺服阀和伺服比例阀主要应用在闭环控制系统，其它结构的比例阀主要应用在开环控系统及闭环速度控制系统；2.1 伺服阀中位没有死区，比例阀有中位死区；2.2 伺服阀的频响（响应频率）更高，可以高达200Hz左右，比例阀一般Z高几十Hz；2.3 伺服阀对液压油液的要求更高，需要精过滤才行，否则容易堵塞，比例阀要求低一些；3.阀芯结构及加工精度不同。比例阀采用阀芯+阀体结构，阀体兼作阀套。伺服阀和伺服比例阀采用阀芯+阀套的结构。4.中位机能种类不同。比例换向阀具有与普通换向阀相似的中位机能，而伺服阀中位机能只有O型。5.阀的额定压降不同。而比例伺服阀性能介于伺服阀和比例阀之间。比例换向阀属于比例阀的一种，用来控制流量和流向。

   D41FSE04C4NLW0
    D41FSE04C4NXW0
    D41FSE06C1NXW0
    D41FSE06C4NXW0
    D41FTB31FC1NF00
    D41FTB31FC1NF10
    D41FTB31FC1NG00
    D41FTB31FC2NF00
    D41FTB31FC2NG00
    D41FTB31FC4NF00
    D41FTB31FC4NF10
    D41FTB31FC4NG00
    D41FTB31FC5NF00
    D41FTB31FC5VG00
    D41FTB32FC1NF00
    D41FTB32FC1NG00
    D41FTB32FC1VF00
    D41FTB32FC2NF00
    D41FTB32FC2NG00
    D41FTB32FC4NF00
    D41FTB32FC4NG00
    D41FTB32FC4VF00
    D41FTB32FC5NF00
    D41FTB32FC5NG00
    D41FTE01FC1NF00
    D41FTE01FC1NG00
    D41FTE01FC1VF00
    D41FTE01FC2NF00
    D41FTE01FC2NG00
    D41FTE01FC4NF00
    D41FTE01FC4NF08
    D41FTE01FC4NG00
    D41FTE02FC1NF00
    D41FTE02FC1NF10
    D41FTE02FC1NG00
    D41FTE02FC1VF00
    D41FTE02FC2NF00
    D41FTE02FC2NG00
    D41FTE02FC4NF00
    D41FTE02FC4NG00
    D41FTE02FC4VF00
    D41FTE02FC5NF08
    D41FTE03FC1NF00
    D41FTE04FC1NF00
    D41FTE04FC4NF08
    D41FTE05FC4NG00
    D41FTE80FC4NF00
    D41FWA31FC4NLW0
    D41FWA32FC1NLW0
    D41FWA32FC4NLW0
    D41FWB31FC1NLW0
    D41FWB31FC1NXW0
    D41FWB31FC1VLW0
    D41FWB31FC2NLW0
    D41FWB31FC4NLW0
    D41FWB31FC4VLW8
    D41FWB31FC5NLW0
    D41FWB31FC5VLW8
    D41FWB32FC1NLW0
    D41FWB32FC1VLW0
    D41FWB32FC2NLW0
    D41FWB32FC2NXW0
    D41FWB32FC2VLW0
    D41FWB32FC4NLW0
    D41FWB32FC4NXW0
    D41FWB32FC4VLW0
    D41FWB32FC5NLW0
    D41FWB32FC5VLW0
    D41FWE01FC1NLW0
    D41FWE01FC1NXW0
    D41FWE01FC2NLW0
    D41FWE01FC2NLW8
    D41FWE01FC2NXW0
    D41FWE01FC2VLW0
    D41FWE01FC4NLW0
    D41FWE01FC4NXW0
    D41FWE01FC4VLW0
    D41FWE02FC1NLW0
    D41FWE02FC1NLW8
    D41FWE02FC1NXW0
    D41FWE02FC1VLW0
    D41FWE02FC2NLW0
    D41FWE02FC2NXW0
    D41FWE02FC4NLW0
    D41FWE02FC4NXW0
    D41FWE02FC4VLW0
    D41FWE02FC5NLW0
    D41FWE02FC5NXW0
    D41FWE03FC2NLW0
    D41FWE03FC4NLW0
    D81FHA31E1NB00
    D81FHA31E4VB00
    D81FHA31H1NB00
    D81FHA31H2NB00
    D81FHA31H5NB00
    D81FHA32F1NB00
    D81FHA61H2NB00
    D81FHB11H4NB00
    D81FHB12H1NE00
    D81FHB12H4NB00
    D81FHB12H4NE00
    D81FHB14H1NB00
    D81FHB31E1NB00
    D81FHB31E2NB00
    D81FHB31F5NB08
    D81FHB31H1NB00
    D81FHB31H2NB00
    D81FHB31H2NE08
    D81FHB31H4NB00
    D81FHB31H5NB00
    D81FHB31H5NE00
    D81FHB32E1NB00
    D81FHB32E2NE00
    D81FHB32E4NB00
    D81FHB32F1NB00
    D81FHB32F1NE00
    D81FHB32F2NB00
    D81FHB32F5NB00
    D81FHB32H1NB00
    D81FHB32H1NE00
    D81FHB32H2NB00
    D81FHB32H2NE00
    D81FHB32H4NB00
    D81FHB61E1NB00
    D81FHB61F2NB00
    D81FHB61H1NB00