Piston Diaphragm Pumps Operating Principle: The energized solenoid pulls the piston and diaphragm up, drawing fluid into the pump. A spring forces the piston back to its original position when the solenoid is de-energized, forcing fluid of the pump, and the cycle is repeated. Valves are utilized to prevent backflow and to maintain prime. A diaphragm prevents leaking into the pump. Standard models are constructed with 24-volt DC solenoids. A switch is required to supply pulse voltage to the pump. Can this metering pump be used to evacuate air from a system? Yes, up to the self-priming limit. Can the piston diaphragm pump be cycled faster than recommended? What are the down sides to doing this? The pump can cycle up to 32 Hz and can both evacuate air and pump liquid. Repeatability and head may not reach catalog listings, so please contact GRI. Are higher flow rates possible? Yes, we can supply diaphragm pumps that flow over 500 microliters per stroke. Please contact GRI. Are 115V models available? Yes, but you will need to supply a device that cycles the voltage off and on. One cycle per second is the maximum recommended rate. Are 12V models available? Yes. Registered Trademark Names ©2005, Gorman-Rupp Industries
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