Dear SND,

In my case also same situation, 24" horizontal , huge weight, that's y we also model the actuator in CAESAR as rigid by it's weight and length.

what I learn from the above discussions......

Summary:

1.If any piping system having only static analysis case, for the design of ACTUATOR--- Provide DX,DY,DZ values to vendor at the last node of valve Actuator.(STATIC ANALYSIS + MODE SHAPE-Graphics. -- From SND

2.If any piping system having dynamic analysis also, we can get the actual displacements values---- Provide a table with f, Dx,Dy,Dz, and sqrt[Dx^2+Dy^2+Dz^2] for the points considered. -- From Marig

3. Try to support the pipe upstream and downstrem of the valve to make rigid and tell the vendor negligible vibration from pipe. -- From PKU

Thanks for sharing ur valuable inforamtions.. in the above statements if any one find mistake/wrong/any suggestions ur welcome....