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

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...

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

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

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...

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...

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...

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 &...

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...

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

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...

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

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...

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

This ventury flow model is built in ball valve

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 ...

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

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

bogiedreame, How about Turcon.. John

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