DR 30-5-5X/50YMV现货减压阀DR 30-5-5X/50YMV
【简单介绍】
【详细说明】
DR 30-5-5X/50YMV
武穴黎翔机电设备有限公司,询价:何女士
询价:,
询价
询价: 736567721,704552157
伺服阀的主阀一般来说和换向阀一样是滑阀结构,只不过阀芯的换向不是靠电磁铁来推动,而是靠前置级阀输出的液压力来推动,这一点和电液换向阀比较相似,只不过电液换向阀的前置级阀是电磁换向阀,而伺服阀的前置级阀是动态特性比较好的喷嘴挡板阀或射流管阀。
也就是说,伺服阀的主阀是靠前置级阀的输出压力来控制的,而前置级阀的压力则来自于伺服阀的入口p,假如p口的压力不足,前置级阀就不能输出足够的压力来推动主阀芯动作。
而我们知道,当负载为零的时候,如果四通滑阀*打开,p口压力=t口压力+阀口压力损失(忽略油路上的其它压力损失),如果阀口压力损失很小,t口压力又为零,那么p口的压力就不足以供给前置级阀来推动主阀芯,整个伺服阀就失效了。所以伺服阀的阀口做得偏小,即使在阀口全开的情况下,也要有一定的压力损失,来维持前置级阀的正常工作。
伺服阀其实缺点极多: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zui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,控制比伺服要灵活一些。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,响应要慢。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!
区别
R900507156 DR 25 G4-5X/50YM
R900503274 DR 25 G4-5X/100YM
R900957888 DR 25 G4-5X/200YM
R900565137 DR 25 G4-5X/315YM
R900558308 DR 25 G4-5X/315YMV
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R900431509 ZDR 10 DB2-5X/75YM
R900441887 ZDR 10 DB2-5X/75YMV
R900408340 ZDR 10 DB2-5X/150YM
R900570282 ZDR 10 DB2-5X/150YMV
R900443484 ZDR 10 DB2-5X/210YM
R900587565 ZDR 10 DB2-5X/210YMV
R900431392 ZDR 10 DB3-5X/25YM
R901029542 ZDR 10 DB3-5X/25YMV
R900472027 ZDR 10 DB3-5X/75YM
R900438729 ZDR 10 DB3-5X/75YMV
R900471974 ZDR 10 DB3-5X/150YM
R900935264 ZDR 10 DB3-5X/150YMV
R900519131 ZDR 10 DB3-5X/210YM
R900903756 ZDR 10 DB3-5X/210YMV
R900952406 ZDR 10 DB7-5X/75YM
R900925917 ZDR 10 DB7-5X/150YM
R900921263 ZDR 10 DB7-5X/210YM
R900967504 ZDR 10 DP1-5X/25YM
R900432179 ZDR 10 DP1-5X/25YMV
R900410877 ZDR 10 DP1-5X/75YM
R900450298 ZDR 10 DP1-5X/75YMV
R900411247 ZDR 10 DP1-5X/150YM
R900508341 ZDR 10 DP1-5X/150YMV
R900411246 ZDR 10 DP1-5X/210YM
R900550022 ZDR 10 DP1-5X/210YMV
R900410899 ZDR 10 DP2-5X/25YM
R900481889 ZDR 10 DP2-5X/25YMV
R900410875 ZDR 10 DP2-5X/75YM
R900429511 ZDR 10 DP2-5X/75YMV
R900410880 ZDR 10 DP2-5X/150YM
R900431772 ZDR 10 DP2-5X/150YMV
R900410876 ZDR 10 DP2-5X/210YM
R900487690 ZDR 10 DP2-5X/210YMV
R900481806 ZDR 10 DP3-5X/25YM
R900591106 ZDR 10 DP3-5X/25YMV
R900411255 ZDR 10 DP3-5X/75YM
R900423004 ZDR 10 DP3-5X/75YMV
R900493965 ZDR 10 DP3-5X/150YM
R900406329 ZDR 10 DP3-5X/150YMV
R900401090 ZDR 10 DP3-5X/210YM
R900520650 ZDR 10 DP3-5X/210YMV
R900948244 ZDR 10 DP7-5X/25YM
R901016846 ZDR 10 DP7-5X/25YMV
R900590407 ZDR 10 DP7-5X/75YM
R901003180 ZDR 10 DP7-5X/75YMV
R900431999 ZDR 10 DP7-5X/150YM
R900786712 ZDR 10 DP7-5X/150YMV
R900590408 ZDR 10 DP7-5X/210YM
R901048538 ZDR 10 DP7-5X/210YMV
R900704141 ZDR 10 VA4-3X/50YM
R900589381 ZDR 10 VA4-3X/50Y
R900905262 ZDR 10 VA4-3X/100YM
R900468829 ZDR 10 VA4-3X/100Y
R900922706 ZDR 10 VA4-3X/200YM
R900586156 ZDR 10 VA4-3X/200Y
R900442677 ZDR 10 VA4-3X/315YM
R900451501 ZDR 10 VA4-3X/315Y
R900501717 ZDR 10 VA4-3X/315YV
R900455274 ZDR 10 VA5-3X/50YM
R900436635 ZDR 10 VA5-3X/50YMV
R900434583 ZDR 10 VA5-3X/50Y
R900437011 ZDR 10 VA5-3X/50YV
R900471879 ZDR 10 VA5-3X/100YM
R900519325 ZDR 10 VA5-3X/100YMV
R900436537 ZDR 10 VA5-3X/100Y
R900437021 ZDR 10 VA5-3X/100YV
R900580972 ZDR 10 VA5-3X/200YM
R900975661 ZDR 10 VA5-3X/200YMV
R900444003 ZDR 10 VA5-3X/200Y
R900438181 ZDR 10 VA5-3X/200YV
R900562939 ZDR 10 VA5-3X/315YM
R900442678 ZDR 10 VA5-3X/315Y
R900562977 ZDR 10 VA5-3X/315YV
R900596713 ZDR 10 VA6-3X/50YM
R900425850 ZDR 10 VA6-3X/50Y
R900575449 ZDR 10 VA6-3X/50YV
R900977795 ZDR 10 VA6-3X/100YM
R900464323 ZDR 10 VA6-3X/100Y
R900440131 ZDR 10 VA6-3X/100YV
R900507902 ZDR 10 VA6-3X/200YMV
R900477640 ZDR 10 VA6-3X/200Y
R900594285 ZDR 10 VA6-3X/315Y
R901116713 ZDR 10 VA7-3X/50Y
R900512359 ZDR 10 VA7-3X/50YV
R900526682 ZDR 10 VA7-3X/100Y
R900463807 ZDR 10 VA7-3X/200Y
R900780007 ZDR 10 VA7-3X/315Y
R901017378 ZDR 10 VB4-3X/50YM
R900704143 ZDR 10 VB4-3X/50Y
R900905263 ZDR 10 VB4-3X/100YM
R900512622 ZDR 10 VB4-3X/100Y
R900537560 ZDR 10 VB4-3X/100YV
R900944037 ZDR 10 VB4-3X/200YM
R900525462 ZDR 10 VB4-3X/200Y
R900512307 ZDR 10 VB4-3X/200YV
R900513525 ZDR 10 VB4-3X/315Y
R900507733 ZDR 10 VB5-3X/50YM
R900587413 ZDR 10 VB5-3X/50Y
R900565403 ZDR 10 VB5-3X/50YV
R900518186 ZDR 10 VB5-3X/100YM
R900509786 ZDR 10 VB5-3X/100YMV
R900457022 ZDR 10 VB5-3X/100Y
R900512358 ZDR 10 VB5-3X/100YV
R900506201 ZDR 10 VB5-3X/200YM
R900538790 ZDR 10 VB5-3X/200YMV
R900462912 ZDR 10 VB5-3X/200Y
R900513691 ZDR 10 VB5-3X/200YV
R900562940 ZDR 10 VB5-3X/315YM
R900469405 ZDR 10 VB5-3X/315YMV
伺服阀与比例阀的区别
伺服阀与比例阀之间的差别并没有严格的规定,因为比例阀的性能越来越好,逐渐向伺服阀靠近,所以近些年出现了比例伺服阀。
比例阀和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;直接作用式调节阀又称为弹簧负载式调节阀,其结构内有弹性元件:如弹簧、波纹管、波纹管式的温包等,利用弹性力与反馈信号平衡的原理。
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