查询词典 ball valve

Our company is special in the production and sales of Brass ball valve. Check valve.

公司主要生产和销售黄铜球阀、止回阀、角阀及管件类产品。

If the tool is still no response, the most likely scenario is that OMNI valve ball valve closed.

如果工具仍然没有反应，最有可能的情况是OMNI阀的球阀关闭着。

Needle valve and ball valve structure similar to and different is its conical spool so long, was streamlined.

针形阀的结构与球形阀相近，不同点是它的阀芯做细长的圆锥，呈流线型。

December 2, 2009 afternoon, Tuen valves trial of 40-inch diameter, Butterfly Valves pressure ball valve 600Lb welded pipeline testing organization in the state authority - Hefei Hefei General Machinery Research Institute under the Electrical Products Inspection Institute under test successfully passed through the pressure seal, Hydraulic seals and intensity of three tests, which marks the Tuen valves welded large diameter pipeline valve trial project a complete success.

2009年12月2日下午，屯阀公司试制的口径40寸、压力600Lb全焊接管线球阀在国家权威检测机构―合肥通用机械研究院下属的合肥机电产品检测院检测下，顺利通过气压密封、液压密封和强度三项试验，这标志着屯阀公司大口径全焊接管线球阀试制项目取得圆满成功。

Rotary control valves used in the main ball valve, butterfly valve REDUCING VALVES and so on.

应用于角行程控制的阀门主要有球阀、蝶阀等。

Evolved from the stopcock High-Pressure Forged-Steel Ball Valve valve.

球阀是由旋塞阀演变而来。

As the complete characteristic curves of reversible pump turbine are often used to calculate the instantaneous parameters, this paper studies the characteristic curve and the wicket closure and opening law in pumped storage plants.Chapter 1 presents the importance and the necessity of this study and reviews the previous related research on hydraulic transient process and valve regulation in pumped storage plants.Chapter 2 analyzes the six collected characteristic curves of reversible pumped turbine and studies their diversification from the point of view of specific speed. The six collected discharge and moment curves with maximum efficiency have been fitted to piecewise continuous curves. This curve-fitting procedure is listed.Chapter 3 takes Liyang Pumped storage plant as an example and analyzes the effect of different characteristic curves on regulation guarantee parameters and the variety of its trochoid during the same operation status.Chapter 4 takes three pumped storage plants with different heads as examples and studies the characteristic of coordinated closure with wicket gate and ball valve and its effect on dynamic pressure in the spiral case, inlet pressure in the draft tube and the rise of rotating speed.Chapter 5 summarizes this paper and point out what should be done in the future research.

由于在过渡过程分析计算中，需要频繁利用可逆式机组的全特性曲线推求机组的瞬时参数，所以本文就特性曲线及关闭规律问题进行了研究，其主要内容如下：第1章，指出本文研究的意义和目的，回顾前人对水力过渡过程、抽水蓄能电站及阀调节的研究成果，在此基础上提出本文的研究内容；第2章，针对收集到的六套特性曲线，从比转速的角度出发来研究可逆式机组特性曲线的变化规律；并对六套曲线的最高效率流量和力矩曲线进行分段拟合，得到各分段函数的具体形式，再通过举例说明最高效率曲线的拟合步骤；第3章，以溧阳抽水蓄能电站为实例，分析讨论不同比转速特性曲线对调保参数造成的影响及对于相同工况其轨迹线的变化；第4章，结合高、中、低三水头段抽水蓄能电站，在导叶直线关闭的基础上，研究导叶与球阀协联关闭规律的特点及对蜗壳动水压力、尾水管进口压力及转速上升造成的影响；第5章，总结全文，提出今后研究的重点和方向。

When the hand wheel rotation, driving the plunger in the hole through the stem up and down reciprocating motion of the middle frame to complete the valve opening and Two Piece Trunnion Ball Valve closing function.

当手轮旋转，通过阀杆带动柱塞在孔架中间上下往复运动来完成阀门的开启与关闭功能。

They can produce a "ball valve" effect by intermittently occluding the atrioventricular valve orifice.

他们可以产生&球阀&效应，引起房室瓣口间歇性关闭。

Manual cut-off valve, ball valve can be installed in the pipeline in any position.

手动截止阀、球阀可安装在管路的任何位置上。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。