Control valve ppt
-
Upload
tarit-mahata -
Category
Documents
-
view
2.173 -
download
2
Transcript of Control valve ppt
![Page 1: Control valve ppt](https://reader034.fdocuments.us/reader034/viewer/2022052218/556133fbd8b42a92358b47fc/html5/thumbnails/1.jpg)
TODAY’S TOPIC
CONTROL VALVEcontroller
Inst Air
![Page 2: Control valve ppt](https://reader034.fdocuments.us/reader034/viewer/2022052218/556133fbd8b42a92358b47fc/html5/thumbnails/2.jpg)
What is control valve?Control valves are such type of valves which are controlled remotely to maintain
flow rate, Level, pressure and temperature directly or indirectly as per requirement.
Application of CONTROL VALVE:
Flow rate controlLevel controlPressure control
Temperature control
![Page 3: Control valve ppt](https://reader034.fdocuments.us/reader034/viewer/2022052218/556133fbd8b42a92358b47fc/html5/thumbnails/3.jpg)
Control valve in FLOW CONTROL
controller
Inst Air
dP Flow measurement
![Page 4: Control valve ppt](https://reader034.fdocuments.us/reader034/viewer/2022052218/556133fbd8b42a92358b47fc/html5/thumbnails/4.jpg)
Control valve in LEVEL CONTROL
controller
Inst Air
![Page 5: Control valve ppt](https://reader034.fdocuments.us/reader034/viewer/2022052218/556133fbd8b42a92358b47fc/html5/thumbnails/5.jpg)
Control valve in PRESSURE CONTROL
controller
Inst Air
Pressurized vessel
![Page 6: Control valve ppt](https://reader034.fdocuments.us/reader034/viewer/2022052218/556133fbd8b42a92358b47fc/html5/thumbnails/6.jpg)
Control valve in Temperature Control
controller
Inst Air
Super heated Steam in
Steam outCold water in
Hot water out
![Page 7: Control valve ppt](https://reader034.fdocuments.us/reader034/viewer/2022052218/556133fbd8b42a92358b47fc/html5/thumbnails/7.jpg)
Relationship of major components of a control valve
Control valve
![Page 8: Control valve ppt](https://reader034.fdocuments.us/reader034/viewer/2022052218/556133fbd8b42a92358b47fc/html5/thumbnails/8.jpg)
Classification of control valve on the basis of actuator action
![Page 9: Control valve ppt](https://reader034.fdocuments.us/reader034/viewer/2022052218/556133fbd8b42a92358b47fc/html5/thumbnails/9.jpg)
Classification of control valve on the basis of valve action
![Page 10: Control valve ppt](https://reader034.fdocuments.us/reader034/viewer/2022052218/556133fbd8b42a92358b47fc/html5/thumbnails/10.jpg)
Failure mode
Actuator action
Valve bodyaction
Control valveaction
Failure mode Valve Color
Direct Direct Air to close FAIL OPEN Green
Direct Reverse Air to open FAIL CLOSE Red
Reverse Direct Air to open FAIL CLOSE Red
Reverse Reverse Air to close FAIL OPEN Green
![Page 11: Control valve ppt](https://reader034.fdocuments.us/reader034/viewer/2022052218/556133fbd8b42a92358b47fc/html5/thumbnails/11.jpg)
Characteristic of control valve
![Page 12: Control valve ppt](https://reader034.fdocuments.us/reader034/viewer/2022052218/556133fbd8b42a92358b47fc/html5/thumbnails/12.jpg)
Characterized valve plugs
![Page 13: Control valve ppt](https://reader034.fdocuments.us/reader034/viewer/2022052218/556133fbd8b42a92358b47fc/html5/thumbnails/13.jpg)
Characterized cages for glove style valve bodies
![Page 14: Control valve ppt](https://reader034.fdocuments.us/reader034/viewer/2022052218/556133fbd8b42a92358b47fc/html5/thumbnails/14.jpg)
Pictures ofFew typical valves
![Page 15: Control valve ppt](https://reader034.fdocuments.us/reader034/viewer/2022052218/556133fbd8b42a92358b47fc/html5/thumbnails/15.jpg)
Glove valve
![Page 16: Control valve ppt](https://reader034.fdocuments.us/reader034/viewer/2022052218/556133fbd8b42a92358b47fc/html5/thumbnails/16.jpg)
Angle valve and two port valve
![Page 17: Control valve ppt](https://reader034.fdocuments.us/reader034/viewer/2022052218/556133fbd8b42a92358b47fc/html5/thumbnails/17.jpg)
Cage valve and aerodynamic noise reduction
![Page 18: Control valve ppt](https://reader034.fdocuments.us/reader034/viewer/2022052218/556133fbd8b42a92358b47fc/html5/thumbnails/18.jpg)
Butter fly valve
![Page 19: Control valve ppt](https://reader034.fdocuments.us/reader034/viewer/2022052218/556133fbd8b42a92358b47fc/html5/thumbnails/19.jpg)
Ball valve
![Page 20: Control valve ppt](https://reader034.fdocuments.us/reader034/viewer/2022052218/556133fbd8b42a92358b47fc/html5/thumbnails/20.jpg)
Control valve used as a shutdown valve
![Page 21: Control valve ppt](https://reader034.fdocuments.us/reader034/viewer/2022052218/556133fbd8b42a92358b47fc/html5/thumbnails/21.jpg)
….and same arrangement with redundant.
![Page 22: Control valve ppt](https://reader034.fdocuments.us/reader034/viewer/2022052218/556133fbd8b42a92358b47fc/html5/thumbnails/22.jpg)
Valve leakage refers to flow through a valve which is set in the 'off' state
In the United States, the American National Standards Institute specifies six different leakage classes, with "leakage" defined in terms of the full open valve capacity:
Class I, or 'dust-tight' valves, are intended to work but have not been tested
Class II valves have no more than 0.5% leakage with 50psi (or less if operating pressure is less) of air pressure at the operating temperature
Class III valves have no more than 0.1% leakage under those conditions; this may require soft valve seats, or lapped metal surfaces
Class IV valves have no more than 0.01% leakage under those conditions; this tends to require multiple graphite piston rings or a single Teflon piston ring, and lapped metal seats.
Class V valves leak less than 5/10^12 cubic meters, per second, per bar of pressure differential, per millimeter of port diameter, of water when tested at the service pressure.
Valve leakage
![Page 23: Control valve ppt](https://reader034.fdocuments.us/reader034/viewer/2022052218/556133fbd8b42a92358b47fc/html5/thumbnails/23.jpg)
Valve leakage
Class VI valves are slightly different in that they , and are required (at 50psi or operating pressure, whichever is less) to have less than a specified leakage rate in milliliters of air per minute:
1 inch 0.15 ml/min1.5 inch 0.30 ml/min 2 inch 0.45 ml/min2.5 inch 0.60 ml/min 3 inch 0.90 ml/min 4 inch 1.70 ml/min 6 inch 4.00 ml/min 8 inch 6.75 ml/min10 inch 9 ml/min12 inch 11.5 ml/min
![Page 24: Control valve ppt](https://reader034.fdocuments.us/reader034/viewer/2022052218/556133fbd8b42a92358b47fc/html5/thumbnails/24.jpg)