原文：
           按用途分为单向阀和换向阀。单向阀：只允许流体在管道中单向接通，疏水阀反向即切断。换向阀：改变不同管路间的通﹑断关系﹑根据阀芯在阀体中的工作位置数分两位﹑三位等；根据所控制的通道数分两通﹑三通﹑四通﹑五通等；衬里阀门根据阀芯驱动方式分手动﹑机动﹑电动﹑液动等。图2为三位四通换向阀的工作原理。P 为供油口，电动执行器O 为回油口，A ﹑B 是通向执行元件的输出口。当阀芯处於中位时，全部油口切断，执行元件不动；当阀芯移到右位时，P 与A 通，B 与O 通；当阀芯移到左位时，P 与B 通特殊阀门，A 与O 通。这样，执行元件就能作正﹑反向运动。

 　　60年代后期，在上述几种液压控制阀的基础上电磁阀又研制出电液比例控制阀。它的输出量(压力﹑流量)能随输入的电信号连续变化。电液比例控制阀按作用不同，相应地分为电液比例压力控制阀﹑电液比例流量控制阀和电液比例方向控制阀等。

“ Direction Control Valve Overview ”是由中国截止阀网提供的阀门新闻，译文仅供参考。另外，中国截止阀网还提供相关产品搜索： 直通(流)式截止阀、 角式截止阀、 电站截止阀、 高压截止阀、 波纹管截止阀。等

译文：
         Divided by one-way valves and valve applications. One-way valve: only allows one-way fluid in the pipe connected to theSAFETY VALVES reverse that is cut off. Valve: change between different pipeline through ﹑ ﹑ off relations in accordance with the work of the spool valve position in a few minutes 2 ﹑ 3, etc.; number of channels under the control of two-way communication ﹑ ﹑ ﹑ Three Five-, etc.; spool drive under way points manually,REDUCING VALVES electrically powered, motor and other hydraulic ﹑. Figure 2 shows the working principle of the three four-way valve.PLUG VALVES P for the oil port, O port for the oil return, A ﹑ B is the path to implementation of the components of the output. When the spool is in the medium, cut off all oil port, the implementation of the fixed component; when the spool when moved to the right places, PMULTI-FUNCTIONAL WATER PUMP CONTROL VALVE and A Link, B and O links; when the spool when moved to the left position, P and B Tong, A and O links. Thus, implementation of the components can be reverse movement is ﹑. The late 60s, some of these hydraulic controlMUD VALVES valve further developed based on electro-hydraulic proportional control valve. Its output (pressure ﹑ traffic) can change with the input electrical signal. Electro-hydraulic proportional control valve according to different functions, accordingly, is divided into electro-hydraulic proportional pressure control valve ﹑ hydraulic proportional flow control valves and electro-hydraulic proportional directional control valve.

原文来源：http://www.1jiezhifa.com/

2010-09-01 08:08

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