Hydraulic Pumps for High Pressure Non-Flammable Fluids

Design considerations that 8000 psi and non-flammable fluids have upon an aircraft inline piston hydraulic pump are presented. The influence of the major physical properties of one non-flammable fluid, chlorotrifluoroethylene (CTFE), are discussed as well as the influence of the hydraulic system.

Hydraulic pump pressure, based on experience with the U.S. Navy Lightweight Hydraulic System (LHS), can be increased to 8000 psi without encountering major problems. Utilization of CTFE as a hydraulic fluid shows considerable promise.

The performance characteristics of an 8000 psi pump, are presented. The paper includes a summary of the high pressure operating experience.

The paper concludes with a summary of the Wright Patterson Air Force Base Contract for three 40 gpm 8000 psi CTFE pumps.