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原文
Characteristics of the development control valve Review the history of control valves, control valve characteristics of the development are as follows. ① control valve development and the development of industrial process control are closely related. For example, the: Single-seat valve unbalanced force, pressure differential can not meet the industrial production process control requirements, for developing a balanced spool with the sleeve valve; when the control valve noise has become an important environmental pollution, many with noise reduction and noise reduction control valve trim in place; when the industrial production process of high temperature, low temperature and leakage have certain requirements, was born to adapt to high and low temperature elongation-type valve cover and the use of bellows seal valve cover. ② control valve development and improve product quality, reduce raw material consumption and other closely, the control valve product updates and increased variety, extensions, to adapt more and more widely. For example, the control valve of the varieties are single-seat valves, valve seat, three-way valve, angle valves, sleeve valves, valve isolation valves, diaphragm valves, high pressure valves, eccentric rotary valve, eccentric disc valves, butterfly valves, gate valves, etc.; pneumatic actuator diaphragm actuators, pneumatic piston actuator, pneumatic actuator fine small film, a long stroke pneumatic actuators, electric actuators, electro-hydraulic actuators, gear actuators, etc.; pneumatic valve positioner door positioning device, electropneumatic positioner, intelligent electric valve positioner and so on. ③ The development of control valves for industrial applications more convenient, flexible and reliable. Control valve is more suitable for design calculations using the formula; control valve installation and maintenance more convenient; control valve trim design, such as flow path design, material selection, lower Noise design, the wider industrial application side, the use of more reliable.
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译文：

译文：
回顾控制阀发展历史，控制阀发展特点如下。 ①控制阀的发展与工业生产过程控制的发展密切相关。例如，：单座阀的不平衡力大，不能适应工业生产过程高压差的控制要求，为此，研制了带平衡阀芯的套筒阀；当控制阀噪声已成重要环境污染时，不少具有降噪功能的控制阀和降噪的阀内件应运而生；当工业生产过程对高温、低温和泄漏等有一定要求时，诞生了适应高温和低温的伸长型阀盖和用波纹管密封的阀盖等。 ②控制阀的发展与提高产品质量，降低原材料消耗等紧密结合，使控制阀产品的品种更新和增加，功能扩展，适应面越来越广。例如，控制阀的品种有单座阀、双座阀、三通阀、角形阀、套筒阀、阀体分离阀、隔膜阀、高压阀、偏心旋转阀、偏心阀板阀、蝶阀、闸阀等；执行机构有气动薄膜执行机构、气动活塞执行机构、气动精小型薄膜执行机构、气动长行程执行机构、电动执行机构、电液执行机构、齿轮执行机构等；阀门定位器有气动阀门定位器、电气阀门定位器、智能电气阀门定位器等。 ③控制阀的发展使工业应用更方便、灵活、可靠。控制阀设计计算采用更适合的计算公式；控制阀的安装和维护变得更方便；控制阀阀内件设计，例如流路设计、材质选用、降噪设计等，使工业应用面更广泛，使用更可靠。

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