原文：
　           调节阀类型的选择 1调节阀的阀体类型选择阀体的选择是调节阀选择中最重要的环节。 调节阀阀体种类很多，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10种。在选择阀门之前，要对控制过程的介质、工艺条件和参数进行细心的分析，收集足够的数据，了解系统对调节阀的要求，根据所收集的数据来确定所要使用的阀门类型。

在具体选择时，电磁阀可从以下几方面考虑: (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，阀芯、阀座接合面每一次关闭都会受到严重摩擦。因此阀门的流路要光滑，阀的内部材料要坚硬。 (3)耐腐蚀由于介质具有腐蚀性，隔膜阀在能满足调节功能的情况下，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，闪蒸和空化不仅影响流量系数的计算，还会形成振动和噪声，旋塞阀使阀门的使用寿命变短，因此在选择阀门时应防止阀门产生闪蒸和空化。

      2调节阀执行机构的选择

   2.1输出力的考虑 执行机构不论是何种类型，其输出力都是用于克服负荷的有效力(主要是指不平衡力和不平衡力矩加上摩擦力、密封力、重力等有关力的作用)。因此，为了使调节阀正常工作，配用的执行机构要能产生足够的输出力来克服各种阻力，保证高度密封和阀门的开启。 对于双作用的气动、液动、电动执行机构，疏水阀一般都没有复位弹簧。作用力的大小与它的运行方向无关，因此，选择执行机构的关键在于弄清最大的输出力和电机的转动力矩。对于单作用的气动执行机构，输出力与阀门的开度有关，调节阀上的出现的力也将影响运动特性，因此要求在整个调节阀的开度范围建立力平衡。

   2.2执行机构类型的确定 对执行机构输出力确定后，柱塞阀根据工艺使用环境要求，选择相应的执行机构。对于现场有防爆要求时，应选用气动执行机构，且接线盒为防爆型，不能选择电动执行机构。如果没有防爆要求，则气动、电动执行机构都可选用，但从节能方面考虑，应尽量选用电动执行机构。对于液动执行机构，其使用不如气动、电动执行机构广泛，但具有调节精度高、动作速度快和平稳的特点，因此，在某些情况下，为了达到较好调节效果，必须选用液动执行机构，如发电厂透明机的速度调节、炼油厂的催化装置反应器的温度调节控制等。

“Choosing the type of control valve ”是由中国调节阀网提供的国际阀门新闻，译文仅供参考。另外，中国调节阀网还提供相关产品搜索： 智能调节阀、 自动调节阀、 水力调节阀、 执行器和附件、 更多调节阀产品等。

译文：
           Choosing the type of control valve A control valve of the valve type selection valve control valve selection is the most important part of choice. Valve of many types, commonly used by direct single-seat, through engine, angle, diaphragm, small traffic, links, eccentric rotation, butterfly, sleeve type, spherical and other 10 species. Prior to the selection valve to the media on the control process, process conditions and parameters of careful analysis, collection of sufficient data, understandMotorized Valve Actuators the system requirements on the control valve, according to the data collected to determine the type of valve to be used. In the specific choices available from the following aspects: (1) disc shape of the structure mainly based on the choice of flow characteristics and considerations such as power imbalances. (2) wear resistance when the fluid medium is the high concentration of abrasive particles in suspension, the spool, the valve seat will be closed joints every serious friction. Therefore, the valve flow path to smooth, hard materials to the internal valve. (3) corrosion resistance as a corrosive medium, to meet regulatory function in the case, as we choose simple valve. (4) medium temperature and pressure when Globe Valvesthe medium temperature, high pressure and great change, and should be chosen disc and seat materials by temperature and pressure changes small valves. (5) to prevent the flash and the flash cavitation and cavitation only in a liquid medium. In the actual production process, the flash and the air of not only affect the calculation of flow coefficient, but also the formation of vibration and noise, shortening the life of the valve, the valve should be to prevent the valve in the choice ofRegulators steam and air of . 2, the choice of control valve actuator 2.1 Output power considerations Implementing agencies of whatever type, the output power are used to overcome the load of effectiveness (mainly refers to the unbalanced force and unbalanced moment with friction, sealing force, gravity, and the role of the force). Therefore, in order to work valve, equipped with the executive body of the output to be able to generate sufficient force to overcome resistance, to ensure a high degree of sealing and the valve opening. For double acting pneumatic, hydraulic, electric actuator, generally not reset spring. Force size has nothing to do with its running direction, so the key lies in selecting executing agencies to ascertain the maximum output power and torque of the motor rotation. For Multi-functional Water Pump Control Valvesthe single action of the pneumatic actuator, output force and the opening of valves, regulating valves of the force there will also affect the movement characteristics, thus requiring the opening of the valve to establish equilibrium degrees. 2.2 Determination of type of the implementing agencies The implementation of the output power is confirmed, use of environmental requirements according to the process, select the appropriate enforcement agency. For the scene, where explosion-proof requirements, should use pneumatic actuator, and the terminal box explosion proof, can not choose the electric actuator. If no explosion-proof requirements, pneumatic, electric actuators can be used, but energy considerations, should try to use electric actuator. For the hydraulic actuator, its use as Water Power Control Valvespneumatic, electric actuators widely, but with adjustment of high precision, movement speed and stationary, therefore, in some cases, in order to achieve better regulation, it is necessary the implementation of selected hydraulic institutions, such as power plants and transparent machine speed regulation, the refinery catalytic cracking unit reactor control temperature regulation.

原文来源：http://www.1tiaojiefa.com/

2010-08-23 08:44

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