Pump Selection

By Bob Wojcik

Hydraulic circuits have many different requirements for flow volume, pressure capability, fluid compatibility, and component life expectancy. To meet the challenges of the full range of system requirements, Quality Hydraulics & Pneumatics, Inc. can provide a vast array of the hydraulic pumps available for either the industrial or mobile market today, including gear, vane, axial piston, radial piston, and axial checkball pumps.

Each pump type performs best in specific applications. For example, gear pumps are most often used when the circuit requires constant fluid flow, constant pressure, and relatively lower system pressure such as below 2000 psi. Gear pumps can be more “forgiving” of contamination in a hydraulic system than other pump types. Quality Hydraulics provides a wide range of gear pumps from both Concentric and Bucher Hydraulics.

Vane pumps are typically used in circuits requiring either variable flow and/or variable pressure but which also require a system pressure of 3000 psi or less. For vane pumps particularly suited to these applications, Quality Hydraulics represents both the Yuken and Nachi brands.

Sometimes a particular application will require even higher system pressure. Axial and radial piston pumps are typically used in systems that operate up to 5000 psi. Quality Hydraulics’ axial piston pumps are manufactured by Yuken or Dynex, while the radial piston pumps with this higher pressure rating are available from Moog.

For those applications requiring an even higher system working pressure, up to 10,000 psi, Quality Hydraulics can specify and provide axial checkball pumps. An example of a system requiring this 10,000 highest pressure rating might be a test stand application. The highest pressure rated pumps, good for up to 10,000 psi, are manufactured by Dynex.

Nearly all of the pumps can be specified with a selection from a wide variety of operating controls including pressure compensation, load sensing, horsepower limiting, proportional pressure, and proportional flow controls. In addition the seals specified on the various pumps provide compatibility with many fluid types including mineral based hydraulic fluid, synthetic hydraulic fluid, and fire resistant hydraulic fluid.

Pump manufacturers also offer flexible mounting and porting or connection styles. These styles can meet either SAE or metric mounting and porting standards. In addition, the technical salespeople at Quality Hydraulics also evaluate and consider your requirements for economy, performance, and product life.

For additional information, we invite you to read this PDF on pulsation dampeners and pulsation cause and solutions.

Contact Quality Hydraulics & Pneumatics, Inc. for hydraulic and pneumatic component sales, customer service and certified support. Phone: (847) 680-8400 Fax: (847) 680-5325 E-mail: info@qualityhydraulics.com