ball valve torque 4

[jars0]

Hi, I am new in this field so snybody can tell me how to calculate the torque for ball valves?
thanks in advance.

 

[hsbcn]

This site will be of help:

http://www.cheresources.com/valvezz.shtml

My focus: Alloy Valves Super Duplex Valves Monel Valves Incoloy Valves [link titanium-valves.com]Titanium Valves[/url] Hastelloy Valves

 

[PeterIgg]

Again???

Ask the manufacturer of the valve(s) you intend to use. There is no reliable, generic method that I am aware of of predicting torques as the number of variables is huge. In fact I would be getting the manufacturer to size the actuator and take responsibility for the package. Depending on the lengths you wish to go to and the criticality you can get proving tests &c.
Major factors that will affect the torque are (but not limited to):
Size;
Class;
Construction type;
Seat material;
Full/Reduced bore;
Line media;
Line pressure (upstream and downstream);
Temperature;
Frequency of operation / how long sat in one position;

Get the picture? If you have not designed and made the valve you have no chance other than by empirical methods. If you have made the valve you will have done the testing!

 

[NGiLuzzu]

I agree with Peter: the first option should be contacting the valve Manufacturer.

I'd just add that many of them have their own "sizing software" that may also include a torque calculation part (in addition to the valve selection and flow calculation sections).
See, for instance:

- thread408-131262 within this Forum;

-

http://sizing.tycovalves.com/Pages/default.aspx;

-

http://www.kalsi.com/kvap.htm;

- etc...


Hope this helps,
'NGL
_______________________

 

[skuntz]

Here is another good resource:

http://www.flowserve.com/files/File...owControl/WorcesterControls/WCENSS0001-01.pdf