What is difference between ball valve and needle valve?


#1

Design-wise:

The operating element. A needle valve has a tapered shaft (needle) pressed against a seat. Which is lowered or raised by a screw that is connected to the wheel or handle etc the top.

A ball valve has a sphere seated between a gasket or “stuffing”. This sphere/ ‘ball’ normally has a through hole of same bore as that of inlet connection. (Called the full bore design) this ball is connected to a stem that in turn is connected to a handle.

Now, operation-wise:

needle valve is of precision or regulation application.

Ball valve on the other hand is a coarse flow control. Normally just open and close…