查询词典 backflow

These features, along with high-precision processing technologies have helped to miniaturise these products. The micropump is 6.0mm in diameter and 24.0mm in length, the microvalve measures 3.5mm in diameter and 10.3mm in length. The products are small but ensure high functionality by incorporating fluid, structure and magnetic field analysis simulations. Development will contribute to enhanced miniaturisation, an indispensable prerequisite for portable device fuel cells. Through the optimal design of diaphragm operations, valve configuration to prevent fluid backflow, materials and layout, Alps has achieved the effective control of larger amounts of fluid in a smaller chassis for its micropump. The unit also employs low-voltage electromagnetic drive systems, which contribute to easy control and fuel cell system engineering.

这 2002：机床，入世是挑战更是机遇专家指出要加大我国数控机床研发力度加快普及型数控机床的发展漫话中国机床制造业的服务竞争中国铣床和加工中心市场的现状和展望国内外车床的技术水平和发展方向世界加工中心的生产、需求和发展动向国内外机床发展趋势世界数控系统发展趋势切削加工技术和数控机床的发展现代机床产品技术发展趋势我国高速加工技术现状及发展趋势利用先进制造技术提升汽车活塞加工水平瓶盖及瓶口模具上特殊螺纹的数控车削深孔的螺纹加工数控车床螺纹切削方法分析与应用磨削蜗杆砂轮的修整精密零件多台阶面磨削的新方法曲轴连杆颈的跟踪磨削工艺

Valves used to regulate working conditions at the pump, check valve in the liquid pump to prevent backflow when the reverse, and pumps to avoid water hammer blow.

阀门用来调节泵的工况点，逆止阀在液体倒流时可防止泵反转，并使泵避免水锤的打击。

Pump valves used to regulate the working conditions, Nizhi when the valve to prevent backflow of liquid in the pump reverse, and pumps to avoid water hammer blow.

阀门用来调节泵的工况点，逆止阀在液体倒流时可防止泵反转，并使泵避免水锤的打击。

Designed to retrofit backflow protection onto fire hydrants used for temporary water service.

适用于用在临时性水应用的消防栓上的防回流阀的更新改造。

For distributive mixing ability, KB120/120 and FTX showed excellent performance on distributive mixing ability, because they had the greatest backflow and the widest distance between inflexions of RTD curve respectively.

对于分布混合能力，由于物料在流经错列角为120°的捏合盘元件时回流量最大，在流经六棱柱元件时停留时间分布曲线拐点间的距离最大，因此这两种元件的分布混合能力很强。

First, we adopt MEMS technology to fabricate micro venturis with different widths of 150 and 200 um respectively and utilize FLUENT software to analyze the flow fields. Air was set as the working fluid and the air mass flow rate of inlet is changed to obtain the pressure drop between inlet and outlet. When a flow passes through the throat, the backflow results in the symmetric separations occur and grow with the increase of mass flow rate.

在微文氏管的研究部分，首先利用微机电制程技术制造出两种不同尺寸的微文氏管，宽度分别为150及200微米，开口角度各为45°，总长则为10 mm，再以空气作为工作流体，利用不同质量流率来量测微文氏管进出口的压力差并配合FLUENT软体分析观察其流场分布的情况。

NOTE : For Australia and New Zealand, Pipeline strainers should be installed between the upstream shutoff valve and the inlet of the backflow preventer.

注意：适用于澳大利亚和新西兰：管路过滤器应该安装在上游关闭阀和防回流阀进口之间。

As a downstream piping system when the valve opens, reflux valve, when closed, the main medium used to prevent backflow to prevent the pump and drive motor reversal, as well as a container medium discharge; currently the most commonly used is the valve flap around the body Swing Pin rotation flap valve and the valve body along the vertical axis to move lift check valve, but the above two kinds of structures exist in the valve closed, medium speed back quickly from the largest drop to zero, inlet side of the pipe resulted in the rapid pressure rise, resulting Proportional Pressure Reducing Valves in damaging effects on the piping system of water hammer phenomenon, it is generally a diameter of valve production of 50 ~ 500 mm.

止回阀作为管道系统顺流时开启，逆流时关闭的阀门，主要用于防止介质倒流，防止泵及驱动电机反转以及容器内介质泄放；目前使用最普遍的是阀瓣围绕阀体销轴旋转的旋启式止回阀和阀瓣沿着阀体垂直中心线移动的升降式止回阀，但以上2种结构的阀门均存在关闭时介质倒流速度从最大迅速降为零，致使管道进水管一侧内压迅速升高，从而产生对管路系统有破坏作用的水锤现象，所以一般止回阀生产口径为50～500 mm。

The following Test Procedure is one of several that is recognized throughout the United States for verification of the functioning of Backflow preventers.

下列检测程序是在美国广泛使用的防回流阀性能检测程序中的一种。

The following Test Procedure is one of several that is recognized throughout the United States for verification of the functioning of Backflow preventers.

下列检测程序是美国公认的几种防回流阀功能检测程序中的一种。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。