Grade A Hermetically Sealed Hydraulic Servo System 650337
The paper discusses the techniques which successfully achieved Grade A hermetic sealing of a complete hydraulic servo system. Design concepts are set forth; actual hardware is illustrated; and supporting data are noted. The system that was sealed included the motor pump, servo valves, relief valve, dump valve, the hydraulic side of the actuator, the filter, and all O-rings. All these components were immersed in the oil reservoir and then sealed from the atmosphere by Grade A hermetic seals.