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  • Users: thought2007
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  1. thought2007

    Self locking in Compound spur gear train

    Hi Everyone, Thanks for suggestions!! Indeed I started working by adopting worm gears to lock Thanks once again John
  2. thought2007

    Self locking in Compound spur gear train

    Hello, I were going through Electromechanical actuator document which is driven by DC Motor with Compound spur gear train. But the system demands self locking feature after actuator reach 90deg rotation.My Question is there any possibilities of self locking with compound spur gear train...
  3. thought2007

    AGE00003 guideline for Ball valve

    Hi hsbcn, thanks for providing good info.Indeed the document which i mentioned was generated inside my company. Thanks John
  4. thought2007

    AGE00003 guideline for Ball valve

    Hi, I am designing Fire shutoff valve used in aircraft. I come across "AGE00003 guideline" which is used for designing the Valve. Would request experts here to throw light about what "AGE00003 guideline" document contains. Thanks in advance John
  5. thought2007

    Actuation Torque Vs Pressure drop curve for BALL VALVE

    Hi, Thanks very much Itascot & gerhardI and I am sorry for delay reply as I was on vaccation for two weeks gerhardI, Size : 0.875" Fluid: Ether poly propelene(Red oil) The purpose of this analysis is I am developing Actuator to open & close the valve using DC Motor. So I need to find out...
  6. thought2007

    ball valve actuation torque estimation using CFD tool

    Industrial expert's opinion is maximum torque required to actuate ball valve is "Torque ability to open under large differential pressure and to close under high flow conditions " My objective is to determine Actuation torque Vs Pressure drop curve (through digital prototyping) using CFD...
  7. thought2007

    Actuation Torque Vs Pressure drop curve for BALL VALVE

    Industrial expert’s opinion is maximum torque required to actuate ball valve is “Torque ability to open under large differential pressure and to close under high flow conditions “ My objective is to determine Actuation torque Vs Pressure drop curve (through digital prototyping) using CFD...
  8. thought2007

    Ball valve stem sizing

    Wintechcad, To find out max torque requirement to actuate the ball is completely iterative process.I have done these calculation by considereing max breakaway toraue can be expected when the valve is in closed condition.Its power loss due to friction between kinematic elements like Ball &...
  9. thought2007

    Max pressure during closing of the ball in Ball valve

    Hello, I am estimatning theorotical torque for Ball valve actuation.Is there any empirical formula exists to find out max pressure during closing of the ball. Is follwoing formula can be used to find drop Delt P= density of fluid*Speed of sound in fluid*Velocity of fluid/gravitational force...
  10. thought2007

    Seating load for Ball valve

    bcd & JimCasey Thanks for your valuable posts. according to bcd,working on contact stress requirement using following empirical formula fc=Sqrt of (P*E/2.88*As) where P= Radial load E=Youngs modulus As = Contact surface area Once i finish will get back to you Thanks once again John
  11. thought2007

    Seating load for Ball valve

    Hi, how much seating force required to control leakage for following requirements. Allowable leakage when closed condition is 0.5cc/min. The seating material used is Teflon Operating pressure is 60psig Differential pressure when closed condition is 70psid Earlier i were trying with yeild...
  12. thought2007

    aircraft valves

    Fuzzy305 lee valves is the best choice for miniature valves & I would suggest Eaton aerospace also well known in aerospace valves John
  13. thought2007

    Analytical Ventury design approach for finding Cd (coeff.dis) value

    Hello, Would like to know whether the following analytical ventury design approach is correct or Incorrect to find Coefficient of discharge. Following are the available design data to find Cd 1.Geometry of flow path is defined (throat dia Diametrical ratio "Beta") 2.Upward flow data is...
  14. thought2007

    Pressure drop in ventury flow model

    Jimcasey, Pipe dia: .875in orifice dia:.6inch John
  15. thought2007

    Pressure drop in ventury flow model

    This ventury flow model is built in ball valve
  16. thought2007

    Pressure drop in ventury flow model

    Hi I have question on Pressure drop in ventury flow model Is pressure loss at convergence & Orifice going to regain at divergence.The flow path is horizontal,length of convergence and divergence is same Operating pressure:60psi Fluid temp : -56degF to 230degF Flow rate : 18gpm Fluid ...
  17. thought2007

    Design Books for Fire shutoff valve for aerospace application

    I am working on designing of fireshutoff valve(Motor operated ball valve)for Aerospace application.size is 7/8inch valve. would appreciate your suggestion for considering reference books for design
  18. thought2007

    Gasket material for FSOV

    Hello, What good gasket material is avaialble for Fire shutOff valve. Would appreciate lead suggestion for below requirements. Operating temp ;607degF to +230deg F Fluid : MIL-PRF-5606 Opearing pressure : 90psi John
  19. thought2007

    High Temperature Seat Seals for Ball Valves

    bogiedreame, How about Turcon.. John
  20. thought2007

    Calculating flow resistance coefficient for butterfly valve

    apf, With moody chart you can find out flow resistance John

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