A.R.I. RP-500, A.R.I. RP-501, are Backflow Preventer Valves designed to provide maximum protection against backflow caused by back-siphonage or backpressure. Backflow may cause infiltration of chemicals, fertilizers and/or other pollutants into potable water systems. Comprised of two independent, easily replaceable, capsulated spring-loaded check valves. An internal ‘reduced pressure’ zone, located between the check valves, ensures optimal protection and reliable performance of the pressure-relief valve.
Product Page (PDF)
Size Unit
Connection size
Working temperature
Working temperature range
0.5° C - 45° CMax intermittent temperature
60° CEnd connection type
Threaded NPT – ANSI B1.20.1
A.R.I. RP-500/501
A.R.I. RP-501 with shut-off valves
Operation of A.R.I. RP-500
A.R.I. RP-500 in Action - Normal Flow
A.R.I. RP-500 in Action - Normal Shutoff
A.R.I. RP-500 in Action - Vacuum Upstream
A.R.I. RP-500 in Action - 1st Check Valve Leakage
A.R.I. RP-500 in Action - Vacuum Upstream, 2nd Check Valve Leakage
A.R.I. RP-500 in Action - Backpressure and 2nd Check Valve Leakage
