VICKERS威格士比例阀主要用在电气液压伺服系统中作为执行元件(见液压伺服系统)。在伺服系统中,液压执行机构同电气及气动执行机构相比,具有快速性好、单位重量输出功率大、传动平稳、抗干扰能力强等特点。另一方面,在伺服系统中传递信号和校正特性时多用电气元件。因此,现代高性能的伺服系统也都采用电液方式,伺服阀就是这种系统的必需元件。
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;
美国VICKERS威格士比例阀/比例阀的使用说明
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-般高几十Hz;
2.3伺服阀对液压油液的要求更高,需要精过滤才行
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