Piston Diaphragm Pumps

Piston diaphragm pumps are positive displacement pumps designed to economically transfer small volumes of fluid at low discharge pressures. The lightweight, compact pumps are self-priming, corrosion resistant and can handle viscous fluids. These features make the pumps ideal for high volume copy machines, scientific and laboratory instruments and other chemical dispensing applications.

Operation:
Standard models are constructed with 12 or 24 volt DC solenoids. A switch is required to supply pulsed voltage to the pump. 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 out of the pump, and the cycle is repeated. Valves are utilized to prevent back-flow into the pump and to maintain prime.

Specifications:

• Flow Rate — Range to 250 microliters per stroke
• Max Discharge Pressure — Range to 2.6 psi (6')
• Self-Priming — To 3 feet
• Max Fluid Viscosity — To 300 centistokes
• Max Fluid Temperature — To 200°F (93°C)
• Typical Duty Cycle — 1 cycle/second (1⁄2 sec. on - 1⁄2 sec. off). Higher frequency operation achievable with external driver.
• Metering Accuracy — ±2% stroke-to-stroke (for a stationary setup)
• I.D. Tubing Size — 3⁄16"
• Approximate Weight — .265 lb.

Note: Positive suction head above 6" requires tight valves; consult factory for availability.

Features:

• Economical
• Self-priming
• No dynamic seals
• No backflow
• Continuous duty rated
• Corrosion resistant
• Dry run capability                           

Piston Diaphragm Pumps Overview (PDF)

Registered Trademark Names

©2005, Gorman-Rupp Industries