Are the 0923 series PVC ball valves suitable for chlorinated pool water?

Yes, the 0923 Series PVC ball valves are manufactured with P.T.F.E. seats and VITON Stem O-Rings, all of which are suitable for chlorine water.

PVC Chemical Compatibility - Chlorine Water -A - Excellent (Satisfactory to 120°F (48°C))

https://www.calpaclab.com/pvc-polyvinyl-chloride-chemical-compatibility-chart/

PTFE Chemical Compatibility - Chlorine Water - A - Excellent

https://www.calpaclab.com/teflon-ptfe-compatibility/

VITON Chemical Compatibility - Chlorine Water - A - Excellent

https://www.calpaclab.com/viton-chemical-compatibility-chart/

WARNING - PVC ball valves are not suitable for dry chlorine or anhydrous liquid chlorine (see link below) as these chlorine variations are rated D - Severe Effect on PVC.

Anhydrous Definition in Chemistry:

https://www.thoughtco.com/anhydrous-chemistry-definition-603387

Additional Resources:

https://support.boshart.com/where-can-i-find-chemical-compatibility-information

https://support.boshart.com/strength-/-pressure-derating-factors-increased-operating-temperatures-thermoplastic-piping

https://support.boshart.com/do-the-terms-schedule-40-and-schedule-80-apply-to-pvc-ball-valves