And experimental research on performance of the CO2 transcritical water-to-water heat pump cycle system with expander or throttling valve was executed .

同时还对带膨胀机或 节流 阀的CO2跨临界水-水热泵循环系统进行了实验研究。

In order to lower the throttling losses in the CO 2 transcritical cycle the significant measure is to replace the throttling valve by an expander .

为降低CO2跨临界循环的节流损失，开发膨胀机代替 节流 阀是研究的重要方向。

This article contains three optimization goals : following the load instruction reducing the throttling losses of turbine high-pressure main steam valve and reducing the amount of fuel .

本文的优化目标有快速跟踪负荷指令、减少汽机高压主 汽门 节流损失和减少燃料量。

A malfunction caused by localizer excursion of liquid-nitrogen throttling valve in an air separation unit

一起液氮 节流 阀定位器漂移引发的空分设备故障

The automatic test has been realized by adopting the proportional throttling valve for loading and by use of the CAT technology based on the virtual instrument .

系统采用比例 节流 阀加载方法以及基于虚拟仪器的CAT技术，实现了测试过程的自动化。

The results show that the structural characteristics of throttling grooves have direct influences on pressure distribution cavitation and noise inside the valve . Pressure overshoot inside U-notch is much higher than V-notch and can restraint the inception and development of cavitation .

结果表明， 节流槽结构特征对 阀内压力分布、气穴与噪声特性有直接的影响，U形槽内部压力超调量明显高于V形槽，可以显著抑制气穴的析出与生长。

Besides COP of the system is more sensitive to changes of the inlet isentropic efficiency . ( 2 ) There are two types of throttling losses in traditional dual-temperature vapor compression refrigeration system that is expansion valve throttling losses and pressure regulating valve throttling losses .

传统双温蒸汽压缩制冷系统存在两类节流损失，即膨胀阀产生的 节流损失和压力调节 阀产生的节流损失。

Closer throttling creating higher pressure drops may cause cavitation or excessive velocities which could cause high noise levels vibration and possible damage to the valve or adjacent piping .

如果 节流 较小，将因此产生更高的压降将可能导致空穴现象或超快流速，从而导致噪音太高，振动剧烈，可能损坏 阀门或相邻的管路。

The throttling loss occurred at the point with 120 MW loads and 200 MW loads was analyzed for 200 MW unit the results showed that the extra overlapping of valve at these two points caused a lot of throttling loss .

通过对 哈汽200MW机组在120MW负荷点和200MW负荷点产生的 节流损失分析，发现在这两负荷点 阀门的重叠 度过大， 因而造成过大的节流损失。

Based on the above principle a CO2 swing type expander was developed to take the place of the throttling valve in the system to recover power during the expanding process .

针对以上问题，研究开发了CO2摆动转子式膨胀机以代替系统中的 节流 阀回收膨胀过程能量。

By analyzing the causes of excessive temperature rise of the hydraulic system in a certain plasticizing machine the paper discusses the application range of the volume throttling speed control circuit consisting of limited pressure variable pump and throttling ( speed control ) valve .

从某注塑机液压系统温升过高的原因分析，总结了限压式变量泵和 节流 阀（调速 阀）组成的容积节流调速回路的使用范围。

The gas throttling governing system comprises a pressure-limiting valve a speed-limiting valve and a partition board .

气体推助器包括波纹管及内部弹簧、排气阀、吸气阀，气体 节流调节系统包括限压 阀、限速阀、隔板。

The body of BT25 is constructed by a pilot throttling valve with position feedback and a pressure compensated valve .

BT25 阀的可控流量大，工作压力高、有较高的控制精度。

Study of water digital throttling valve controlled by microcomputer

水压数字 节流 阀微机控制的设计研究

With the throttling the supercritical CO_2 to the separation pressue state the temperature of the supercritical CO_2 decrease to 0 ℃ and this phenomenon cause plugging of the throttle valve and the piping behind it .

超临界CO2 节流至分离状态时，温度会下降到0℃以下，引起节流 阀损坏及下游管道堵塞。

The transcritical carbon dioxide rolling piston expressor ( expander-compressor ) is developed to replace the throttling valve in the CO2 transcritical cycle for the improvement of the performance efficiency of the CO2 transcritical cycle and decreasing larger throttling losses .

为提高二氧化碳跨临界循环效率，解决系统节流损失大的问题，研究开发了新型的滚动活塞转子式压缩膨胀机，来代替二氧化碳跨临界系统中的 节流 阀。

In this paper the author apply petroleum engineering well-control theory to analyze operational principle of multilevel throttling control system in depth set up electrohydraulic proportional valve hydraulic pressure control system mathematics model and use MATLAB to make emulation analysis to it .

在本文中，笔者结合石油工程井控理论，对多级 节流控制系统工作原理作了深入的分析，建立了电液比例 阀液压控制系统数学模型，并对该模型运用MATLAB进行了仿真分析。

Continuous severe throttling applications may require a control valve .

如果 需要持续性的 节流应用，则可能需要 配置控制 阀。

With the development of the investigations of carbon dioxide as a refrigerant the method of replacing throttling valve with expander in order to improve COP of the system has been paid more and more attention to .

随着自然工质CO2研究的进一步发展，为了提高系统的COP，采用膨胀机取代 节流 阀的方法越来越受到人们的重视。

The concept and features of pure water hydraulics And the operating principle as well as the control system designing of digital throttling valve are introduced in this paper ;

介绍了水液压技术的概念及其特点，论述了 直 控 步 进 式水压数字 节流 阀的工作原理及其控制系统的设计。

This paper illustrates operation principle of the digital throttling valve and design of its control system .

论述了 直 控 步 进 式 水压数字 节流 阀的工作原理及其控制系统的设计。

Study on Growth Characteristics of Cavitation Bubble in Throttling Grooves of Hydraulic Valve

液压 阀 节 流槽内气穴气泡生长特性的研究

According to the comparison results of throttling valve cycle and the expander cycle the expander effect on the efficiency is demonstrated .

与采用 节流 阀的CO2跨临界循环系统的对比实验验证了CO2滚动活塞膨胀机对于提高效率的作用。

As the replacement of throttling valve CO_2 expander is a significant way to improve the coefficient of performance of the CO_2 transcritical cycle .

开发CO2膨胀机代替 节流 阀是提高CO2跨临界循环系统性能系数的一个有效途径。

Performance Comparison and Analysis for Inverter driven Air Conditioners Throttling with Electronic Expansion Valve and Capillary Tube

小功率变频空调器采用电子膨胀 阀与毛细管 节流的性能对比分析