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Hydraulic and pneumatic pump construction, performance (controls and operation), and application notes from the field.

Hydraulic Pumps for Skydrol Test Stands

Product Announcement from Dynex/Rivett Inc.

Hydraulic Pumps for Skydrol Test Stands-Image

Dynex hydraulic checkball pumps provide exceptional performance in the harsh conditions required for testing aerospace components. Pumps are available for operation at pressures to 20,000 psi, using a wide range of fluids including Skydrol and various MIL-SPEC fluids.

It is critical that test pumps operate efficiently and reliably under the same harsh conditions as the test components. To ensure completion of the testing, checkball pumps withstand high pressures, extreme temperatures, and continuous duty cycles. These pumps operate reliably with low-viscosity, low-lubricity fluids, including Skydrol, HyJet and other phosphate ester fluids, and various MIL-SPEC fluids.

Longer Service Life

The checkball pump design provides consistently longer service life than other test pump designs. Two check valves in each piston-pumping chamber direct the flow from the inlet side of the pump to the pump outlet port. The stationary barrel and optimum piston/bore clearances facilitate low-leakage.

The increased seating, and sealing, of the checkball valves at higher pressures ensures higher volumetric efficiency, especially with low-viscosity fluids. The checkball rotates and reseats during each pumping cycle, providing even wear for extended pump life and constant volumes. These pumps offer low-noise and low ripple-pressure characteristics, operating with little heat buildup to maintain stable temperatures.

Multiple-Outlet Models

The output from each piston in a checkball pump can be isolated from the other pistons. This allows one multiple-outlet pump to supply up to ten output flows, for example, with a ten-piston pump. Test systems use these Split-Flow® models for simultaneous testing of multiple components with only one pump.


Dynex offers a range of pumps for use in R&D and production testing. Because of the wide-range of fluid characteristics, any application using non-petroleum-based fluids should be reviewed.

Models are available with maximum output flows from 0.68 gpm to 54.0 gpm, at 1800 rpm at rated pressures to 15,000 psi, with maximum pressures to 20,000 psi.

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