控制阀[CONTROL VALVE]

控制阀又称调节阀，是执行器的主要类型，通过接受调节控制单元输出的控制信号，借助动力操作去改变流体流量。控制阀一般由执行机构和阀门组成。如果按其所配执行机构使用的动力，控制阀可以分为气动、电动、液动三种，即以压缩空气为动力源的气动调节阀，以电为动力源的电动控制阀，以液体介质(如油等)压力为动力的电液动控制阀，另外，按其功能和特性分，还有电磁阀、电子式、智能式、现场总线型控制阀等。

Control valves regulating valves as is the implementation of the main types of vehicles, by accepting conditioning control module export control signals from engine operation to change fluid flow. Control valves and valve general, the executing agency. If by their ticket enforcement agencies use the power, control valves can be divided into pneumatic, electrical, fluid movement three, namely to compressed air to power sources pneumatic - valve to call for the engine electric control valves for the liquid medium (such as oil) pressure-driven electricity fluid moving control valves, and their functions and characteristics hours are electromagnetic valves, electronic style, smart, Floor bus-control valves.

控制阀的阀体类型选择
控制阀的阀体种类很多，常用的有直通单座、直通双座、角形、隔膜、小流量、三通、偏心旋转、蝶形、套筒式、球形等。在具体选择时，可做如下考虑：(1)阀芯形状结构，主要根据所选择的流量特性和不平衡力等因素考虑。(2)耐磨损性，当流体介质是含有高浓度磨损性颗粒的悬浮液时，阀的内部材料要坚硬。(3)耐腐蚀，由于介质具有腐蚀性，尽量选择结构简单阀门。(4)介质的温度、压力，当介质的温度、压力高且变化大时，应选用阀芯和阀座的材料受温度、压力变化小的阀门。(5) 防止闪蒸和空化，闪蒸和空化只产生在液体介质。在实际生产过程中，闪蒸和空化会形成振动和噪声，缩短阀门的使用寿命，因此在选择控制阀时应防止阀门产生闪蒸和空化。

valve body types of control valves choice valve body many types of control devices, commonly used by direct-Block, through engine, angle type, divide, and small flows, the three links, eccentricity rotary, butterfly type, sleeve style, spherical. In specific choices, do the following considerations : (1) disc shape of the structure, mainly based on the choice of flow characteristics and consider factors such as power imbalances. (2) The presence of worn when fluid medium is the wear and tear of high concentrations of suspended particulate fluids, valves materials to the internal hard. (3) corrosion resistance, as a corrosive medium, to choose structure simple valves. (4) medium temperature, pressure, when the medium temperature, high pressure and great change, and should be chosen disc valve seat materials by temperature, pressure changes small valves. (5) prevent instant steam and air-based, space-based instant steam and only in a liquid medium. In the actual production process, Shanzheng and will form a vibration of air and noise, shorten the useful life of valves, control valves in the choice should have instant steam and air-based prevention valves.