Preferred Velocities for Check Valves

Could you give more details? A valve cut away will help since the function and fluttering are depending on valve design. Fluttering will occur when the valve as flow at limit pressure is not matched to the flow which limited in pressure. It is usually due to the effect of flow forces which try to close in some uncompensated designs.

You may be able to approximate with the formula for tilting disc checks from Flowserve:

http://www.flowserve.com/vgnfiles/Files/Literature/ProductLiterature/FlowControl/AnchorDarling/ADAMS8007-00.pdf

min vel (ft/s) = 24·√

where is the the specific volume of the fluid (ft³/lbm)

This is a typical problem with DDCV's. To resolve this, the valve manufacturer can supply replacement springs that will meet your service conditions. Just contact one of their Application Engineers to select the spring that you need. It will be a lot easier to replace the spring than to play around with adjusting flow and line pressure.

Dear Mr.Pete,

The Viscosity and Density of fluid plays a vital role.

The opening force is derived from the kinetic energy of the fluid used, during flow due to pumiing. The valve has to open against the pressure due to Static Head and hence the STIFFNESS of the spring should match the pressure created by Static Head.

Thanks,

DHAYANANDHAN.S