Flange thickness for MOV (Motor Operated Valve)

[fatherjoe]

I need to determine the appropriate thickness for an FA16 flange for mounting an electric actuator capable of 740 ft-lbs of torque. I've measured cast flanges on Velan valves at 1.25". I've got a supplier who say's 1" is adequate when welded

I've established my preliminary standards based upon Manufacturer's Standardization Society of the Valve and Fittings MSS SP-101-1989 and MSS SP-102-1989 documents. While providing critical info, there are no specifications for flange thickness.

Thanks

Joe

 

[EdDanzer]

FEA would be the sure way. What size are the bolts and how many are there?

 

[fatherjoe]

Thanks for your prompt response.

I'm a newbie to mechanical, coming from a programming/instrumentation background. I'm not familiar with FEA. What is it?

Are there any resource you can suggest to get me up to speed?

Joe

 

[fatherjoe]

The FA16 flange has a 6.5" BC using 3/4"-10 Grade 5 Bolts per MSS.

Thanks

Joe

 

[EdDanzer]

FEA is for finite element analysis. You probably don’t need to go to that level. Typically the flange should be thicker than the bolt diameter. 1” thick will work but 1 1/4” would deform less when clamped. If deflection can cause sealing problems you may need to go thicker, the valve body will make the flange stiffer than a flat plate bolted to it.