行业新闻

原文
Principle of the servo valve A typical servo valve by a permanent magnet torque motor, nozzle, baffle, valve, valve cover and control cavity (see Figure). When the input current into the coil, the baffle to the right, so that the enhanced role of the right throttle nozzle, flow reduction, the right back pressure rise; while reducing the role of the left throttle nozzle, the flow increases, back pressure down the left . Force at both ends of the spool out of balance, then move to the left spool. High-pressure oil flows from the S C2, to the load. Load back to the oil flow back through the oil port C1, enter the tank. Spool displacement and the input current is proportional to the torque motor, the role of fluid pressure on the spool and the spring force balance, so in equilibrium the differential current and torque motor is proportional to the displacement of the spool. If the input current is the reverse, the flow is reversed. Table is the classification of the servo valve. Servo valve is mainly used in electrical hydraulic servo system as the implementation of components (see hydraulic servo system). In servo systems, hydraulic and pneumatic actuators with electrical actuators, compared with a fast and good, the unit weight of output power, smooth transmission, anti-interference ability and so on. On the other hand, the servo system and signal transmission when the multi-calibration feature Electrical components. Thus, the modern high-performance servo systems are used electro-hydraulic means, the servo valve is necessary component of such a system. Servo-valve structure is complicated, high cost of oil for high quality and cleanliness. The new servo valve is trying to overcome these shortcomings, such as the use of electrostrictive servo valve components, greatly simplifying the structure. Another direction is to develop a special working oil (such as electrical viscous oil). This oil can work under the effect of changes in the magnetic viscosity coefficient. The nature of the electrical signal using the direct control of the oil can flow through.
原文来自：http://www.zhihuifa.org

是由上海依耐泵阀有限公司提供的阀门新闻，中文译文仅供参考，以下提供站内导航搜索：

中国止回阀网止回阀产品止回阀知识止回阀厂商止回阀博客止回阀行业新闻

译文：
典型的伺服阀由永磁力矩马达、喷嘴、档板、阀芯、阀套和控制腔组成(见图)。当输入线圈通入电流时，档板向右移动，使右边喷嘴的节流作用加强，流量减少，右侧背压上升；同时使左边喷嘴节流作用减小，流量增加，左侧背压下降。阀芯两端的作用力失去平衡, 阀芯遂向左移动。高压油从S流向C2，送到负载。负载回油通过 C1流过回油口，进入油箱。阀芯的位移量与力矩马达的输入电流成正比，作用在阀芯上的液压力与弹簧力相平衡，因此在平衡状态下力矩马达的差动电流与阀芯的位移成正比。如果输入的电流反向，则流量也反向。表中是伺服阀的分类。　　伺服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。伺服阀结构比较复杂，造价高，对油的质量和清洁度要求高。新型的伺服阀正试图克服这些缺点，例如利用电致伸缩元件的伺服阀，使结构大为简化。另一个方向是研制特殊的工作油（如电气粘性油）。这种工作油能在电磁的作用下改变粘性系数。利用这一性质就可通过电信号直接控制油流。

更多新闻：