Inside the Checkball Hydraulic Pump: Design and Operating Advantages

Dynex checkball hydraulic pumps use two check valves in each piston pumping-chamber to direct flow from the inlet side of the pump to the pump outlet port. This pump design operates reliably with a wide range of fluids at high pressures. The positive-seating check valves provide better wear and higher volumetric efficiency, especially with low-viscosity, low-lubricity fluids. Operating benefits include: VERTICAL MOUNTING: Unlimited pump orientation provides circuit flexibility. BI-DIRECTIONAL ROTATION: Constant flow direction regardless of drive shaft rotation. PRESSURES TO 20,000 PSI: The design provides a high horsepower-to-weight ratio handling higher loads than other pumps. WIDE RANGE OF FLUIDS: The check valves provide better wear and higher volumetric efficiency with low-lubricity/low-viscosity fluids. NO LUBRICATING OIL REQUIRED: Only the pumped fluid is required for internal lubrication, eliminating a secondary lubrication circuit and reducing maintenance. CONTAMINATION TOLERANT: A large flow path into pistons, and output through the outlet check valves, allows contamination to be flushed through the pump. RESISTANT TO CAVITATION: The outlet checks do not unseat until pumped fluid reaches load pressure, providing reduced decompression shock and resistance to cavitation damage. SPLIT-FLOW: Multiple outlet pumps simplify multiple-function circuits using only one pump, and provide greater output-flow accuracy than flow dividers for synchronized movement. To learn more, visit http://www.dynexhydraulics.com