Clock or counterclockwise helix direction

[maccosvg]

Has helix direction any influence in unscrewing a threaded element? Would appreciate advise in this matter. Has to design a compression spring for a valve disk, whose cage is threaded to the valve seat body. Do not want to lock the cage to the valve seat due to disassembly difficulties.

 

[desertfox]

Hi maccosvg

The simple answer is yes but it doesn't matter which way you wind the spring because depending on whether the deflection of the spring is small or large, the compression spring coils will wind up for the former and for the latter unwind.In addition any axial force acting on two components screwed together will have a tendency rotate one relative to the other due to the thread helix. Can you give more details of the spring and valve parts and any (sketches which can be provided which can be placed in here using the
"process TGML" option at the bottom of the message box)so we may help you further.

regards desertfox

 

[maccosvg]

Desertfox:
Thanks for the information. However, since it is a compression spring of a moving valve, if the helix tryes to unscrew the cage (it is threaded to the valve seat)the spring will do so all a time of the opening and closing of the valve (450 times/minute)
That is why I need to know if the spring is made counterclockwise, and since it is always in compression state, which direction it tends to turn the supporting memeber (the cage). I do not have a sketch now but will have one available tomorrow.

Regards

 

[desertfox]

Hi maccosvg

It is against site policy to enter into private email, can you enter spring information here ie all dimensions and spring rate, number of turns how much is the spring compressed on installation and after the valve operates.
You can place images on here use the process TGML at the bottom of the message box.


regards desertfox