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Cold Temperature Hydraulic Seals for Aerospace Hydraulic Systems

Description:

OBJECTIVE: Design and demonstrate a high pressure hydraulic sealing solution for a dynamic sealing application that is compatible with Military Red Hydraulic Oils and Nitrogen gas down to temperatures of -100 degrees F. DESCRIPTION: Aircraft hydraulic systems have traditionally been required to operate down to -65 degrees F. However, with the advancement of unmanned air vehicles, operating envelopes at high altitudes are evolving. Unmanned Air vehicles are loitering at high altitudes for upwards of 24 hours. As a result, sections of the hydraulic system are becoming cold soaked and prone to leakage. The current solution is to wrap hydraulic components in heater blankets, which add complexity and weight and require electrical power. USAF and NAVAIR seek hydraulic sealing capability for components capable of operating up to 5000 psi, in Mil-PRF-83282, Mil-PRF-87257, MIL-PRF-5606 hydraulic oil and Nitrogen gas. These seals should be capable of sealing in storage down to -100 degrees F and operation from -70 degrees F up to 160 degrees F (Objective: 275 degrees F) in order to reduce or eliminate leakage experienced while operating in cold soaked environments. Proposed efforts can encompass any size seal and configuration that would be compatible with AS 4716 standard seal gland design specification. It is not anticipated Government Furnished Equipment (GFP) will be required for this effort. PHASE I: Identify, develop, and prove feasibility of concept for a high pressure hydraulic sealing solution for a dynamic sealing application that is compatible with Military Red Hydraulic Oils and Nitrogen gas down to temperatures of -100 degrees F. PHASE II: Develop a prototype sealing solution and demonstrate implementation into an AS 4716 seal gland capable of sealing in storage down to -100 degrees F and operation down to -70 degrees F. PHASE III: Perform validation and certification testing to transition the approach to the fleet and other candidate platforms. REFERENCES: 1. AS-5440 2. AS-8775 3. AS-4716 4. MIL-PRF-83282 5. MIL-PRF-87257 6. MIL-PRF-5606
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