球阀

Stem Extension does not permit use of Handle Lockout on True Union 2000 Industrial Ball Valves.

在真活接True Union 2000工业球阀上的阀杆加长组件不允许采用手柄锁定装置。

Valve structure The cut-off valve with pilot valve with manual control and electric control of two types.

阀门结构带先导球阀的截止阀有手动控制和电动控制两种类型。

The factory always insists on the principle of management that the technology is creative.the quality is superior and the client is satisfied.ln the eighties.winning the petroleum academic association API certificate of the US in national valve industries.taking the lead in introducing in the advanced technique abroad such as Japanese north village trunk-like valve agent and gained the producing licence.producing big caliber soheral valves fir coal plasm.oil and pipage and common industry soheral vavles.

在八十年代，在全国阀门行业中就首获美国石油学会API认证，率先引进日本北村阀门株式会社等国外先进技术，并获得生产许可证，生产大口径的煤浆、油、气输送管线球阀和一般工业用球阀。

2 The temperature of the terms 3.2.1 Operating temperature operatingtemperature Working conditions in the steam trap inlet temperature.

3.2有关温度的术语 3.2.1 工作温度operatingtemperature 在工作条件下蒸汽疏水阀进口端的电动球阀温度。

Designed for highly abrasive applications, the Type A Double Wall Sleeve Valve outlasts even stellated V-Ball valves and metal seated valves on abrasive slurries.

A型双层套管夹管阀专用于具有很高磨损性的流体介质应用场合，当应用在研磨泥浆上时，其使用寿命甚至比星状V形球阀和金属阀座阀门更长更耐用。

Valve was evolved from the stopcock.

球阀是由旋塞阀演变而来。

Evolved from the stopcock valve.

球阀是由旋塞阀演变而来。

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。

MONEL -- Is a nickel-copper alloy used primarily as interior trim on butterfly and ball valves.

蒙乃尔--是一种镍铜合金，主要用作蝶阀和球阀的阀内件。

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。