500AR hydraulic diaphragm metering pump

The 500AR hydraulic diaphragm metering pump is designed with an automatic air-release (AR) valve for use with chemicals that off-gas at room temperature, such as sodium hypochlorite. A polyvinyl chloride (PVC) head design minimizes internal space and eliminates areas where gas can accumulate. All ports slope upward to vent gas through the top of the pump and away from the polytetrafluoroethylene (PTFE; Teflon) diaphragm. The PVC AR head can be specified on any of 500E series pump with capacties up to 9 gal/h (higher-capacity pumps purge gas naturally). All Series 500 models have a micrometer dial that allows manual adjustment over a 10:1 turndown range. Automatic control options include pneumatic or electric stroke-length adjustment and variable-speed drives.