版权说明:本文档由用户提供并上传,收益归属内容提供方,若内容存在侵权,请进行举报或认领
文档简介
1、阀门流量计算方法如何使用流量系数How to use Cv阀门流量系数(Cv)是表示阀门通过流体能力的数值。Cv越大,在给定压降下阀门能够通过的流体就越多。Cv值1表示当通过压降为1 PSI时,阀门每分钟流过1加仑15oC的水。Cv值350表示当通过压降为1 PSI时,阀门每分钟流过350加仑15oC的水。Valve coefficient (Cv) is a number which represents a valves ability to pass flow. The bigger the Cv, the more flow a valve can pass with a given
2、pressure drop. A Cv of 1 means a valve will pass 1 gallon per minute (gpm) of 60oF water with a pressure drop (dp) of 1 PSI across the valve. A Cv of 350 means a valve will pass 350 gpm of 60oF water with a dp of 1 PSI.公式1FORMULA 1流速:磅/小时(蒸汽或水)FLOW RATE LBS/HR (Steam or Water)在此:Where:dp=压降,单位:PSIdp
3、=pressure drop in PSIF=流速,单位:磅/小时F=flow rate in lbs./hr.=比容积的平方根,单位:立方英尺/磅(阀门下游)=square root of a specific volume in ft3/lb.(downstream of valve)公式2FORMULA 2流速:加伦/分钟(水或其它液体)FLOW RATE GPM (Water or other liquids)在此:Where:dp=压降,单位:PSIdp=pressure drop in PSISg=比重Sg=specific gravityQ=流速,单位:加伦/分钟Q=flow r
4、ate in GPM局限性LIMITATIONS上列公式在下列条件下无效:Above formulas are not valid under the following conditions:a. 对于可压缩性流体,如果压降超过进口压力的一半。For compressible fluids, where pressure drop exceeds half the inlet pressure. b. 对于不可压缩性流体,如果压降产生空穴或闪蒸。For non-compressible fluids, where pressure drop causes cavitation or flas
5、hing. c. 对于双相流体,如蒸汽-水混合流体。For dual-phase flow such as steam-water mixtures. 例子EXAMPLE1. 通过DN350, 压力等级Class 900的压力密封闸阀,水温400oF,压力为1500 PSIG,流速为5,000,000磅/小时的压降是多少?What is the pressure drop through a 14 Class 900 pressure seal gate valve with 400oF water, 1500 PSIG, and 5,000,000 lbs/hr flow rate?解:采用
6、公式1Solution: Use formula 1. F=5,000,000=0.137 (从水温为400oF的表中得到)=0.137 (from chart for water at 400oF)Cv=9150 (来自本页)Cv=9150 (from page 26)2. DN350 x DN300 x DN350,压力等级Class 900缩喉管压力密封闸阀,其它条件与例1相同,求压降。What is the pressure drop through a 14x12x14 Class 900 Venturi pressure seal gate valve with the same
7、conditions as example 1.解:采用公式1Solution: Use formula 1.Cv = 6285 (来自本页)Cv = 6285 (from page 26)3. 温度900oF, 压力1200 PSI,流速500,000磅/小时的蒸汽应用中压降小于5 PSI的压力等级Class 2500闸阀的最小通径是多少?What is the smallest Class 2500 gate valve that will have less than a 5 PSI pressure drop in 900oF, 1200 PSI steam service at a
8、flow rate of 500,000 lbs/hr?解:采用公式1Solution: Use formula 1. F=500,000=0.785 (来自900oF, 1200 PSIG蒸汽表)=0.785 (from chart for steam at 900oF, 1200 PSIG)= 2.24最接近的、较大的Cv是DN250压力等级Class 2500闸阀,其Cv是3130。这里是压降小于5 PSIG的最小的阀门。The closest higher Cv is a 10 Class 2500 gate with a Cv of 3130. This is the smalles
9、t valve with a pressure drop less than 5 PSIG.水和蒸汽的备选特性Selected Properties of Water and Steam水的(下游)For Water (Downstream)所有压力等级AllPressures温度(oF)Temperature (oF)1002003004005006000.1270.1290.1320.1370.1430.154蒸汽的(下游)For Steam (Downstream)压力PSIG PressurePSIG温度(oF)Temperature (oF)Sat500600700800900100
10、0110010020030040050060070080090010001100120013001400160018002000250030004000500060001.971.461.211.060.9500.8650.8010.7470.7010.6620.6280.5980.5700.5452.201.611.301.110.9790.8952.321.681.381.191.060.9600.8800.8150.7590.7100.6700.6290.5900.5592.441.771.461.261.121.020.9410.8750.8210.7730.7320.6950.662
11、0.6330.580.540.500.410.310.170.160.162.541.851.521.321.181.080.9940.9260.8700.8160.7810.7450.7100.6830.630.590.550.480.420.320.240.192.641.951.601.381.231.131.040.9720.9140.8650.8230.7850.7520.7230.670.630.590.520.460.380.320.282.742.001.651.431.281.171.081.010.9550.9170.8720.8130.7890.7520.700.660.
12、620.550.490.420.360.322.842.071.711.471.331.221.121.050.990.940.900.860.830.790.740.690.650.580.520.440.390.35阀座端口流速计算Calculating Seat Port Velocity下列公式可以用来计算任何阀门的阀座流速:The following formulas can be used to calculate seat portvelocity in any valve:流量(磅/小时): 流速: (英尺/秒)= F()225AFlow (lbs/hr): vel: (fps
13、) = F()225A流量(加仑/分钟): 流速: (英尺/秒)= 0.32QAFlow (GPM): vel: (fps) = 0.32QA在此:Where:F=流量(磅/小时)F=flow (lbs/hr)=比容积的平方根=square root of specific volumeA=阀座端口面积 (英寸2)A=seat port area (in2)Q=流量 (加仑/分钟)Q=flow (gpm)例:DN300型号58809 (压力等级Class 900)止回阀,流体介质为温度500 oF,压力200 PSIG的蒸汽,流速为90,000磅/小时,求阀座端口的流速? Example:Wh
14、at is the seat port velocity in a 12 Figure 58809 (Class 900) check valve with a flow rate of 90,000 lbs/hr of steam at 500 oF and 200 PSIG?解:从蒸汽表得为1.61,从阀座端口面积表A得阀座端口面积为78.5英寸2。Answer:From the steam tables is 1.61, and from the seat port area table A is 78.5 in2.流速: (英尺/秒)= F()225A=90,000 (1.61)225
15、 (78.5)= 118.8 英尺/秒Vel (fps) = F()225A=90,000 (1.61)225 (78.5)= 118.8 fps例:DN300型号180 (压力等级150)旋启式止回阀,流体介质为温度500oF,压力200 PSIG的蒸汽,流速为90,000磅/小时,求阀座端口流速?Example:What is the seat port velocity in a 12 Figure 180 (Class 150) Swing Check Valve with a flow rate of 90,000 lbs/hr of steam at 500oF and 200 P
16、SIG?解:查表得为1.61,A为 113.1英寸3.Answer:From the tables is 1.61 and A is 113.1 in3.流速: (英尺/秒)= F()225A=90,000 (1.61)225 (113.1)= 82.5英尺/秒Vel (fps) = F()225A=90,000 (1.61)225 (113.1)= 82.5 fps局限性LIMITATIONS流速公式在下列条件下无效:Velocity formulas are not valid under the following conditions:a. 对于可压缩性流体,如果压降超过进口压力的一半
17、。For compressible fluids, where pressure drop exceeds half the inlet pressure. b. 对于不可压缩性流体,如果压降产生空穴或闪蒸。For non-compressible fluids, where pressure drop causes cavitation or flashing. c. 对于双相流体,如蒸汽-水混合流体。For dual-phase flow such as steam-water mixtures. 注意NOTE在确定止回阀通径时,最适宜的工作流速应该位于这些范围内:When determi
18、ning sizing for check valves, the optimum operating velocities should fall within these ranges:BB旋启式止回阀:55 至115或135至240BB截止止回阀:40 至120 PS提升式阀瓣止回阀:55至200 PSY形止回阀:148 至200 BB Swing Check Valves - 55 to 115 or 135 to 240BB Stop Check Valves - 40 to 120 PS Tilt Disc Check Valves - 55 to 200 PS Stop Chec
19、k Valves - 40 to 180PS Y- Stop Check Valves - 148 to 200 阀座端口面积“A”(英寸2)适用于螺栓阀帽阀门SEAT PORT AREA A FOR BOLTEDBONNET VALVES (in2)阀门通径Valve Size压力等级Pressure Class150300600900150011/2221/23468101214161820243036 1.83.14.97.112.628.350.378.5113.1137.9182.7233.7291.0424.5671.9969.01.83.14.97.112.628.350.378
20、.5113.1137.9182.7227.0283.5424.5672.0942.01.83.17.112.628.348.774.7108.4130.2170.9213.8261.6380.1590.9851.21.83.14.96.511.826.044.271.0100.0117.91.52.84.06.010.322.738.560.084.5101.6阀座端口面积(英寸2)适用于压力密封闸阀,截止阀,提升式阀瓣止回阀SEAT PORT AREA FOR PRESSURE SEAL GATE,GLOBE, TILT DISC CHECK VALVES (in2)阀门通径Valve Si
21、ze压力等级Pressure Class6009001500250021/23468101214161820245.45.49.623.239.961.088.7173.8310.255.95.910.321.737.758.480.597.2125.2156.7198.0287.33.34.98.318.931.948.769.082.5108.4137.9170.9247.52.43.65.912.621.734.547.258.276.697.2117.9170.9阀座端口面积(英寸2)适用于压力密封Y形截止阀SEAT PORT AREA FOR PRESSURE SEAL Y-GLOB
22、EVALVES (in2)阀门通径Valve Size压力等级Pressure Class9001500250081012141618202439.961.986.686.6135.4135.4198.1302.639.961.986.686.6135.4135.4198.1302.627.242.860.186.686.6135.4135.4198.1螺栓阀帽闸阀全开状态下的流量系数CvBolted BonnetGate Valves FULL OPEN Cv阀门通径Valve Size压力等级Pressure Class150300600900150011/2221/23456810121
23、416182024303616530749071013002090311057208935133501627521560287203576052165862351295001653074907101300311057208935133501627521560278903484051050847651258251653074907101300311055408495128001537029170262703214046710755301142506501220285050257850114751391013827040060010701600250043756840998012000图1螺栓阀帽
24、截止阀Figure 1Bolted BonnetGlobe Valves(1)当开启度小于10%时,不建议用于节流应用。(1) not recommended forthrottling at lessthan 10% Open.压力密封闸阀全开状态下的流量系数CvPressure SealGate Valves FULL OPEN Cv阀门通径Valve Size压力等级Pressure Class6009001500250021/234681012141618202435052592521503775575086001027513425172002095030850350450850192
25、5357552507550915011950155751920027675275415730167529254550657078901032513425168252415019027546011001970313045355500721092151145016575压力密封缩喉管闸阀全开状态下的流量系数CvPressure SealVenturi Gate Valves FULL OPEN Cv阀门通径Valve Size压力等级Pressure Class600900150025008 x 6 x 810 x 8 x 1012 x 10 x 1214 x 12 x 1416 x 14 x 1
26、618 x 16 x 1820 x 18 x 2022 x 20 x 2226 x 24 x 26157027954485731090001100014200168002500013852385406562857200976012185160052300011852155345056406270846511120141308151430251538554415616579609645螺栓阀盖旋启式止回阀全开状态下的流量系数CvBolted CapSwing Check Valves FULL OPEN Cv阀门通径Valve Size压力等级Pressure Class150300600900
27、150011/2221/2346810121416182024306314221735671614142961572078601041613800134201670833384545566316827539274019922340572085441946413800130291627636672546529713922724649913343359544070459840129121954035860516232508406963161113155641520螺栓阀帽截止阀全开状态下的流量系数CvBolted BonnetGlobe Valves FULL OPEN Cv阀门通径Valve S
28、ize压力等级Pressure Class150300600900塞形或球形阀瓣Plug orBallDiscV形端口阀瓣V-PortDisc塞形或球形阀瓣Plug orBallDiscV形端口阀瓣V-PortDisc塞形或球形阀瓣Plug orBallDiscV形端口阀瓣V-PortDisc塞形或球形阀瓣Plug orBallDisc11/2221/234568101223437010018529744081012601890409217027340574511502343701001854408101260189021409217040574523437010018544078018104
29、09217040590170压力密封提升式阀瓣止回阀全开状态下的流量系数Cv Pressure SealTilting Disc Check Valves FULL OPEN Cv阀门通径Valve Size压力等级Pressure Class9001500250021/2346810121416182024951462686271062172224202955394549006275929580132230536940146521102550339543655465806060941463556271020142017752355302537055465压力密封缩喉管提升式阀瓣止回阀全开状态
30、下的流量系数Cv Pressure SealVenturi Tilting Disc Check Valves FULL OPEN Cv阀门通径Valve Size压力等级Pressure Class1503006008 x 6 x 810 x 8 x 1012 x 10 x 1214 x 12 x 1416 x 14 x 1618 x 16 x 1820 x 18 x 2022 x 20 x 2256595515502175266035504410565048084513201900229530553930492032056592012751598212027253335球形止回阀,截止止回
31、阀,提升式止回阀的流量特性曲线Characteristic Flow Curves for Globe Stop, Stop-Check, Lift-Check Valves小于全开状态的估计流量系数CvEstimating Cv For Less Than Fully Open Valves图2球形止回阀,截止止回阀和提升式止回阀Figure 2Globe Stop, Stop-Check andLift-Check Valves压力密封T形球形止回阀,截止止回阀和提升式止回阀阀全开状态下的流量系数CvPressure Seal T-Globe Stop,Stop-Check and Lif
32、t-Check Valves FULL OPEN Cv阀门通径Valve Size压力等级Pressure Class9001500250021/234681012149010519545580012501820220565951703956951085158045651052654707501100压力密封Y球形止回阀,截止止回阀和提升式止回阀阀全开状态下的流量系数CvPressure Seal Y-Globe Stop,Stop-Check and Lift-Check Valves FULL OPEN Cv阀门通径Valve Size压力等级Pressure Class600900150
33、02500810121416182024202530254600430076507325118001645017502725382536506000582591251350017502725382536506000582591251350011751875265040753775662562259050表中所列流量系数仅适用于全开状态下的阀门。不是全开状态的流量系数可以采用适用于提升式阀瓣止回阀和截止阀的流量特性曲线进行估算。不建议将闸阀用在节流应用中。The flow coefficient (Cv) listed in the tables apply to fully open valv
34、es only. Flow coefficients at other than fully open may be approximated by use of the characteristic flow curves for tilting disc check and globe valves. Gate valves are not recommended for throttling service.例:DN300,压力等级Class 900的美国太平洋压力密封截止阀在开气度为1/4时的流量系数是多少?EXAMPLE:What is the Cv of a 12 inch Class 900 Pacific pressure
温馨提示
- 1. 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
- 2. 本站的文档不包含任何第三方提供的附件图纸等,如果需要附件,请联系上传者。文件的所有权益归上传用户所有。
- 3. 本站RAR压缩包中若带图纸,网页内容里面会有图纸预览,若没有图纸预览就没有图纸。
- 4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
- 5. 人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对用户上传分享的文档内容本身不做任何修改或编辑,并不能对任何下载内容负责。
- 6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
- 7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。
最新文档
- 新人教版九年级数学(上册)期末试卷及答案(必考题)
- 2022年人教版九年级物理(上册)期末试卷(附答案)
- 西师版一年级《数学》下册单元测试卷(汇编)
- 2021-2022年部编人教版四年级语文上册期末试卷(审定版)
- 新部编版五年级数学上册期末测试卷及答案一
- 《2.5茧中钻出了蚕蛾》说课稿、教案、教学设计与同步练习
- 面试核心知识导图-日语翻译
- 猎头劝退指南
- 酒泉市重点中学2024年中考生物全真模拟试卷含解析
- 焦作市重点中学2023-2024学年中考英语模拟试题含答案
- 砂卵石地基的勘测方法与承载力研究
- 国家地区中英文对照表(Excel版)
- 各级公路的竖曲线最小长度和半径规定表课件
- 苏教版二年级数学下册《简单数据的收集和整理》评课稿
- 部编2023版道德与法治六年级下册活动园问题及答案
- 电子技术说课稿公开课一等奖市赛课获奖课件
- 中学思政课建设实施方案三篇
- 高铁新城(未来之城)产业发展规划方案
- 旅游管理专业教学资源库旅游管理专业试题
- 【饭圈文化背景下娱乐周边产品销售情况调查分析报告3000字(论文)】
- 模拟电子技术基础(山东联盟)知到章节答案智慧树2023年青岛科技大学
评论
0/150
提交评论