As those that follow this forum regularly they'd know that we've switched from brass angle valves to PVC ball valves for those areas (i.e. basball/softball fields with high speed sprinklers installed for wetting down skinned infield areas for practice/game prep) because of numerous problems with the angle valves being broken... usually from over-tightening. However, we've started experiencing pitting/scratching of the ball valves in the ball or seat areas leading to weeping. (On some of the balls you can actually see scratching marks.) We're very careful about applying the primer/glue to keep them off of these areas but sometimes doo-doo just happens. We've switched to threaded PVC ball valves now instead of the socket type where glue is applied so close to the working parts themselves. We'll install SCH 80 TOE nipples on both ends of the valves so our glue joints are 6" away from the valves themselves. Maybe this will help? At one site we've experienced vandalism where someone is leaving the ball valves partially open, thus, flooding areas of the field. That site is being changed out to brass/bronze curb stop valves (NOT cheap) with LW (locking wedge) tabs. You'll need a curb stop key to activate them and then during the off season we'll put locks on the valves so they can't be used. Here's some pics of the PVC ball valves' pitting. I'll post more on the curb stops when I return to work and we actually make the install.