valves are a common variety of pool valve found on pool plumbing.
Relatively inexpensive to purchase, and simple to use. Good
replacement valve for old brass gate valves.
The disadvantage to these valves is that
they are not serviceable, that is, they cannot be opened up to
make repairs or clear clogs from the valve. The handles on ball
valves tend to break rather easily, and they can also be somewhat
difficult to turn, especially if installed in an awkward
Their advantage is their cost ($10 - $15), and ball
valves tend to be easier to understand for novice pool operators
than the three way type valve. Broken valve handles
are common, so grab this valve near the center of the handle. If
pliers are needed, use a large channel lock type, again grabbing
near the center of the handle while turning.
Here is a rather complicated look at a
pool/spa system using both ball valves and 3 ways valves, with
Ball Valves for sale >>here<<