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biaoyivalve | 9/11 6:16
| 6 次阅读
南岸区20岁的刘东出门就祷告：千万别看见美女了。为啥？因为他一见陌生美女就怕。“因为这个怪毛病，我错过了工作机会。”昨日，刘东说起此事就很苦恼。
老家在万盛的刘东家住南岸区南坪东路7村6号。两周前，经朋友介绍，他到一保险公司面试。“面试我的是位漂亮干练的女领导。”刘东说，他异常紧张，说话时不敢直视对方，眼睛左躲右闪，像做了亏心事，只好低头盯着脚尖。面试没多久，刘东感到自己的脸在发烧，心跳加速，全身发抖。“面试到一半，我就说不下去了，被对方请了出来。”
刘东很郁闷，他说，自己从小性格内向，每次和女生说话就结巴。“难道我天生怕陌生人？”刘东开始自测：乘公交车专坐美女旁边，逛超市特意走在年轻女性身后，买东西只找妙龄服务员……每次，刚坐下就赶紧换位子，没走多久就调头离开，说两句就匆匆闪人……“如果是陌生男性，我可以正常交往。”刘东说，前天，他和几位老乡聚会，都是男性，感觉很轻松。
“一看到女性，我觉得自己心跳加快，脸马上就红了。”刘东说，怕别人看出自己的不自然，他不敢跟陌生女子接触。“结果越害怕越不敢接触。”刘东说，意识到自己的毛病后，害怕的症状越来越严重，还没和异性说话就满脸绯红。
“他性格内向，没想到会怕成这样。”刘东室友张笠说，以前，刘东和陌生女性多说几句就会脸红，大家都笑他腼腆，但没觉得这是问题。“没想到，竟影响到他工作和交友。奇怪的是，他和母亲及表姐妹接触，没这种反应。”
“刘东患了异性恐惧症，这是一种较常见的心理病。”重庆市仁格心理咨询所副所长何天华表示，刘东发现问题想的不是如何克服，而是逃避，症状自然会越来越严重。“他可以通过脱敏疗法，即把陌生女性想象成母亲或表姐妹，在交往的过程中主动调整心态并克服恐惧，相应症状就会逐渐减轻直至消失。” (陈静 符琳)
biaoyivalve | 2/20 22:50
| 30 次阅读
Globe Valve is the closure of the pieces (flap valve) along the centerline of the movement of the valve seat. According to the flap valve in the form of such a move, pass the mouth of the valve seat and valve change is in direct proportion to the relationship between valve trip. Due to the type of valve stem to open or close the relatively short trip, and a very reliable function to cut off, and as a result of changes in the mouth-seat valve with the valve in direct proportion to the relationship of the trip, is well suited for regulating the flow. As a result, this type of valve is very suitable as cut off or reduce expenditure, as well as the use of regulation.
The closing of the valve once the flap valve away from the closed position, its valve seat and valve seal between the surface will not have contact thus sealing its surface mechanical wear and tear is very small, so the seal is a very good performance, the disadvantage is that Sealing surface may be caught between the movement of particles in the media. However, if the flap valve ball or make CERAMIC BALLS, the issue will be tough but welcome a solution. As most of the globe valve of the valve seat and valve repair or replacement easier, but also in the repair or replacement of components without sealing the entire pipeline from the valve down on the demolition of this valve in the pipe and welding into one of the occasions, it is very applicable to The.
As the medium through the valve when such a change in the direction of flow, the globe valve minimum flow resistance was also higher in most other types of valves. However, according to the valve stem structure and relative to the import and export channels of distribution, the situation can be rectified. At the same time. As the globe valve and open valve clearance between the small trip, the sealed surface can bear repeatedly hoist, so it is applicable to the needs of frequent switches of occasions.
Globe valve can be used to process most of the media system. Has been developed to meet the petrochemical, power, metallurgy, construction, chemical industry and other departments use a variety of forms of the globe valve.
The Globe Valve to use a very common, but opened and closed more torque, a longer length of the structure, usually nominal path are limited to the following 250mm, 400mm to have, but when they choose pay particular attention to the direction of import and export. General 15Omm below the globe valve most of the media from the valve into the bottom of the valve, and the globe valve 2O0mm more than most of the media from the valve into the top of the valve. This is because the moment due to the closure of the valve. In order to reduce the torque to open or close the general 2O0mm above the globe valves are located inside or outside the bypass valve by-pass.
biaoyivalve | 12/1 19:22
| 10 次阅读
71. The Pauli Exclusion Principle泡林不相容原理
72. Electron Configurations电子构型
73. The Periodic Table周期表
74. Row行
75. Group族
76. Isotopes, Atomic Numbers, and Mass Numbers同位素，原子数，质量数
77. Periodic Properties of the Elements元素的周期律
78. Radius of Atoms原子半径
79. Ionization Energy电离能
80. Electronegativity电负性
81. Effective Nuclear Charge有效核电荷
82. Electron Affinities亲电性
83. Metals金属
84. Nonmetals非金属
85. Valence Bond Theory价键理论
86. Covalence Bond共价键
87. Orbital Overlap轨道重叠
88. Multiple Bonds重键
89. Hybrid Orbital杂化轨道
90. The VSEPR Model价层电子对互斥理论
91. Molecular Geometries分子空间构型
92. Molecular Orbital分子轨道
93. Diatomic Molecules双原子分子
94. Bond Length键长
95. Bond Order键级
96. Bond Angles键角
97. Bond Enthalpies键能
98. Bond Polarity键矩
99. Dipole Moments偶极矩
100. Polarity Molecules极性分子
101. Polyatomic Molecules多原子分子
102. Crystal Structure晶体结构
103. Non-Crystal非晶体
104. Close Packing of Spheres球密堆积
105. Metallic Solids金属晶体
106. Metallic Bond金属键
107. Alloys合金
108. Ionic Solids离子晶体
109. Ion-Dipole Forces离子偶极力
110. Molecular Forces分子间力
111. Intermolecular Forces分子间作用力
112. Hydrogen Bonding氢键
113. Covalent-Network Solids原子晶体
114. Compounds化合物
115. The Nomenclature, Composition and Structure of Complexes配合物的命名，组成和结构
116. Charges, Coordination Numbers, and Geometries电荷数、配位数、及几何构型
117. Chelates螯合物
118. Isomerism异构现象
119. Structural Isomerism结构异构
120. Stereoisomerism立体异构
121. Magnetism磁性
122. Electron Configurations in Octahedral Complexes八面体构型配合物的电子分布
123. Tetrahedral and Square-planar Complexes四面体和平面四边形配合物
124. General Characteristics共性
125. s-Block Elements s区元素
126. Alkali Metals碱金属
127. Alkaline Earth Metals碱土金属
128. Hydrides氢化物
129. Oxides氧化物
注:本文由china valve由互联网上整理所得.
biaoyivalve | 12/1 19:18
| 22 次阅读
1. The Ideal-Gas Equation理想气体状态方程
2. Partial Pressures分压
3. Real Gases: Deviation from Ideal Behavior真实气体：对理想气体行为的偏离
4. The van der Waals Equation范德华方程
5. System and Surroundings系统与环境
6. State and State Functions状态与状态函数
7. Process过程
8. Phase相
9. The First Law of Thermodynamics热力学第一定律
10. Heat and Work热与功
11. Endothermic and Exothermic Processes吸热与发热过程
12. Enthalpies of Reactions反应热
13. Hess’s Law盖斯定律
14. Enthalpies of Formation生成焓
15. Reaction Rates反应速率
16. Reaction Order反应级数
17. Rate Constants速率常数
18. Activation Energy活化能
19. The Arrhenius Equation阿累尼乌斯方程
20. Reaction Mechanisms反应机理
21. Homogeneous Catalysis均相催化剂
22. Heterogeneous Catalysis非均相催化剂
23. Enzymes酶
24. The Equilibrium Constant平衡常数
25. the Direction of Reaction反应方向
26. Le Chatelier’s Principle列·沙特列原理
27. Effects of Volume, Pressure, Temperature Changes and Catalysts
i.体积，压力，温度变化以及催化剂的影响
28. Spontaneous Processes自发过程
29. Entropy (Standard Entropy)熵（标准熵）
30. The Second Law of Thermodynamics热力学第二定律
31. Entropy Changes熵变
32. Standard Free-Energy Changes标准自由能变
33. Acid-Bases酸碱
34. The Dissociation of Water水离解
35. The Proton in Water水合质子
36. The pH Scales pH值
37. Bronsted-Lowry Acids and Bases Bronsted-Lowry酸和碱
38. Proton-Transfer Reactions质子转移反应
39. Conjugate Acid-Base Pairs共轭酸碱对
40. Relative Strength of Acids and Bases酸碱的相对强度
41. Lewis Acids and Bases路易斯酸碱
42. Hydrolysis of Metal Ions金属离子的水解
43. Buffer Solutions缓冲溶液
44. The Common-Ion Effects同离子效应
45. Buffer Capacity缓冲容量
46. Formation of Complex Ions配离子的形成
47. Solubility溶解度
48. The Solubility-Product Constant Ksp溶度积常数
49. Precipitation and separation of Ions离子的沉淀与分离
50. Selective Precipitation of Ions离子的选择沉淀
51. Oxidation-Reduction Reactions氧化还原反应
52. Oxidation Number氧化数
53. Balancing Oxidation-Reduction Equations氧化还原反应方程的配平
54. Half-Reaction半反应
55. Galvani Cell原电池
56. Voltaic Cell伏特电池
57. Cell EMF电池电动势
58. Standard Electrode Potentials标准电极电势
59. Oxidizing and Reducing Agents氧化剂和还原剂
60. The Nernst Equation能斯特方程
61. Electrolysis电解
62. The Wave Behavior of Electrons电子的波动性
63. Bohr’s Model of The Hydrogen Atom氢原子的波尔模型
64. Line Spectra线光谱
65. Quantum Numbers量子数
66. Electron Spin电子自旋
67. Atomic Orbital原子轨道
68. The s (p, d, f) Orbital s（p，d，f）轨道
69. Many-Electron Atoms多电子原子
70. Energies of Orbital轨道能量
注:本文由china valve由互联网上整理所得.
biaoyivalve | 2008/11/11 0:32
| 96 次阅读
球阀
Analyzing the seal structure evolution of ball valve based on theory of technology evolution of TRIZ
基于TRIZ的技术进化理论分析球阀密封结构的进化
Body Design and Three-dimensional Numerical Simulation of 20″Caliber Medium Pressure Ball Valve
20″通径中压球阀的设计和三维数值模拟
The Application of Direct Single Seat Quick Opening Valve Instead of O-type Ball Valve
直通单座快开阀替代O形球阀的应用
Analysis and calculation are done to determine instantaneous axial hydraulic dynamics for U type directional control ball valve on the basis of a simplified model.
根据U型换向球阀阀腔内液流的流动情况 ,对其阀腔进行了合理的简化 ,提出了计算U型换向球阀阀芯轴向瞬态液动力的简化模型 ,在此基础上推倒出了U型球阀稳定性方程式。
Improving on design ball valve
球阀的改进设计
球形阀
The strength calculation and stress,strain simulation by ANSYS are made for the ball valve of complex structure. Both(results) agree with each other,and the thickness of the valve shell is determined by the strength of local stress at opening instead of integral strength.
对其中结构复杂的球阀阀体和空心球形阀芯进行了强度计算和ANSYS应力、应变模拟分析计算,二者计算结果一致,并认为阀体的厚度由其大开孔处局部应力的整体补强确定。
Floating Ball Valve Three Way Ball Valve Floating Ball Valve With Reduced Bore Three-piece Forged Steel Trunnion Ball Valve Three-piece Forged Steel Ball Valve One Piece Body Ball Valve Trunnion Ball Valve Top Entry
球瓣
To introduce one kind of ball valve sealing structures which is formed through bringing pressure on the seat ring while the ball or disc is rolling towards the seat ring parallelly.
介绍了一种球体或球瓣向阀座平行滚动而压紧阀座形成密封的球阀密封结构。
The paper introduces a kind of ball disk with symmetrical setup,which is a new sealing structure for ball valve through four-bar linkage to realize ball disk flexing and rotary movement,sealing pressure ratio of the valves are adjustable,reliable in sealing and long life in application.
介绍了一种球瓣对称设置 ,通过四连杆机构实现球瓣伸缩及旋转运动的球阀密封新结构。 该阀密封比压可调 ,密封可靠 ,使用寿命长。
球阀阀
Analysis and calculation are done to determine instantaneous axial hydraulic dynamics for U type directional control ball valve on the basis of a simplified model.
根据U型换向球阀阀腔内液流的流动情况 ,对其阀腔进行了合理的简化 ,提出了计算U型换向球阀阀芯轴向瞬态液动力的简化模型 ,在此基础上推倒出了U型球阀稳定性方程式。
Bulging Technique with Polyurethane to Manufacture the Spool of Ball Valve
球阀阀芯一种新的聚氨酯胀形制造工艺的研究
Numerical Simulation and Visualization Study of Cavitating Flow in Hydraulic Ball Valve
球阀阀口气穴流场的模拟与可视化研究
The structure of 20″ caliber medium pressure ball valve and a set of new type "C" shaped metal seal ring are introduced.
介绍了通径为20″(1″=25.4 mm)的大口径中压球阀阀体、新型C形金属密封环组件等的结构设计;
The two dimensional cavitating flow issuing from the orifice of a ball valve was numerically investigated using the combined technologies of the RNG k ε turbulence model and the multiphase flow model.
将 RNG k- ε湍流模型与多相流技术相结合 ,应用于球阀阀口的气穴流场的数值模拟。
注:本文由china valve由互联网上整理所得.
biaoyivalve | 2008/11/11 0:24
| 73 次阅读
A Butterfly Valve is a type of flow control device, typically used to regulate a fluid flowing through a section of pipe. The valve is similar in operation to a ball valve. A flat circular plate is positioned in the center of the pipe. The plate has a rod through it connected to a handle on the outside of the valve. Rotating the handle turns the plate either parallel or perpendicular to the flow. Unlike a ball valve, the plate is always present within the flow, therefore a pressure drop is always induced in the flow regardless of valve position.
There are three types of butterfly valve:
- Resilient butterfly valve which has a flexible rubber seat. Working pressure 232 PSI
- High performance butterfly valve which is usually double eccentric in design . Working pressure up to 725 PSI
- Tricentric butterfly valve which is usually with metal seated design. Working pressure up to 1450 PSI
Butterfly Valve wafer soft seat butterfly valve single eccentric manual wafer soft seat butterfly valve
A butterfly valve is from a family of valves called quarter turn valves. The "butterfly" is a metal disc mounted on a rod. When the valve is closed, the disc is turned so that it completely blocks off the passageway. When the valve is open, the disc is rotated a quarter turn so that it allows unrestricted passage. The position of the disc is effected from outside the valve. There are different kinds of butterfly valves, each adapted for different pressures and different usage. The resilient butterfly valve, which uses the flexibility of rubber, has the lowest pressure rating. The high performance butterfly valve, used in slightly higher-pressure systems, features a slight offset in the way the disc is positioned, which increases the valve's sealing ability and decreases its tendency to wear. The valve best suited for high-pressure systems is the tricentric butterfly valve, which makes use of a metal seat, and is therefore able to withstand a greater amount of pressure. There are three types of butterfly valve: 1. Resilient butterfly valve which has a flexible rubber seat. Working pressure up to 232 PSI 2. High performance butterfly valve which is usually double eccentric in design . Working pressure up to 725 PSI 3. Tricentric butterfly valve which is usually with metal seated design. Working pressure up to 1450 PSI The butterfly valve has a body, a resilient seat, a butterfly disk, a stem, packing, a notched positioning plate, and a handle. The resilient seat is under compression when it is mounted in the valve body, thus making a seal around the periphery of the disk and both upper and lower points where the stem passes through the seat. Packing is provided to form a positive seal around the stem for added protection in case the seal formed by the seat should become damaged. To close or open a butterfly valve, turn the handle only one quarter turn to rotate the disk 90°. Some larger butterfly valves may have a handwheel that operates through a gearing arrangement to operate the valve. This method is used especially where space limitation prevents use of a long handle. Butterfly valves are relatively easy to maintain. The resilient seat is held in place by mechanical means, and neither bonding nor cementing is necessary, Because the seat is replaceable, the valve seat does not require lapping, grinding, or machine work.
Butterfly Valves are valves with a circular body and a rotary motion disk closure member which is pivotally supported by its stem. A Butterfly valve can come in various styles including eccentric and high-performance valves. These are normally a type of valve that uses a flat plate to control the flow of water. As well as this, Butterfly valves are used on fire apparatus and typically are used on larger lines, such as front and rear suctions and tank to pump lines. A Butterfly valve is also a type of flow control device, used to make a fluid start or stop flowing through a section of pipe. The valve is similar in operation to a ball valve. Rotating the handle turns the plate either parallel or perpendicular to the flow of water, shutting off the flow. It is a very well known and well used design.
Types of Butterfly Valves
• Plastic Butterfly Valves • Wafer Style Valves • Wafer Butterfly Valves • Lug Style Valves • Lug Style Butterfly Valves
Plastic Butterfly Valves Plastic butterfly valves are available in two types or styles, wafer and lug. A different installation procedure is used for each one.
Wafer Style Valves Wafer style is the more common of the two and is less expensive than the lug style. The wafer style butterfly valve is just about the standard. It ís so common that no one even bothers to use the word "wafer" when ordering a butterfly valve. They take it for granted that if they order a butterfly valve, they will get a wafer style one.
Wafer Butterfly Valves Wafer butterfly valves are installed between two flanges using bolts or studs and nuts. This type of installation, of course, makes it impossible to disconnect just one side of the piping system from the valve. That is where the lug style valve comes in.
Lug Style Valves Lug style valves have metal inserts installed in the valve's bolt holes. These inserts are threaded on both ends. This allows them to be installed into a system using two sets of bolts and NO nuts. The valve is installed between two flanges using a separate set of bolts for each flange. This setup permits either side of the piping system to be disconnected without distributing the other side.
Lug Style Butterfly Valves Lug style butterfly valves used in dead end service generally have a reduced pressure rating. For example most sizes of Hayward butterfly valves mounted between two flanges have a 150 psi pressure rating. The same valve mounted with one flange, in dead end service, has a 75 psi rating.
注:本文由china valve由互联网上整理所得,来自Wikipedia.
biaoyivalve | 2008/10/17 23:31
| 5 次阅读
valve,also known as valves and valve. Control of fluid flow in the pipe components. Its functions are :
?(1) hoist, or cut off communication pipe fluid flow;
(2) regulatory role of the pipeline resistance to change and adjust fluid through the pipe flow;
(3) reducing expenditure, allowing fluid through the valves after great pressure drop;
(4) based on certain factors automatically open and close to control the flow of fluid to maintain pressure or other role. According to the action principle can be divided into :
(a) he valve, screw plug, cut powerful family, diaphragm valves, Gate Valve, valve disc;
?(2) automatic valves (automatic valve), Check Valve, safety, etc.
11. According to the manipulation of power, can be divided into manual control, motor control, electromagnetic control, pressure control, hydraulic control. Under the pressure valve can be divided into vacuum valves, low pressure valve, the pressure valve, high pressure valves and valve EHV.
Driven by energy, it can be divided into pneumatic, electric and hydraulic three categories; According to stem moves, the straight-type program and the corner; The pneumatic control valves films, films from the above leads to pressure signals, Film and stem the downward movement is said, on the contrary counterproductive said.
Globe Valve Pressure Sealing Globe Valve
