wrote in message

The problem with gate valves is that if you leave them partially open for
long
periods, the gate corrodes away into oblivion. You can turn the stem all
you
want, but there is no longer anything connected to it. Gate valves should
only
be used in the wide open, or completely closed positions.



Actually, gate valves are often used for throttling of the material in the
pipes. They are better than others because they require more turns from
open to close allowing more precise control. Yes, they do wear and corrode,
but that is a normal maintenance function in a process situation. Home use
is entirely different so, as you point out, full open or closed is best.