00399004

Component

The requirement for reliable, precise positioning of functions with remote actuation promoted the development of a pressure-compensated electro-hydraulic proportional flow control valve. Lower horsepower consumption, contamination insensitivity, built-in position feedback, and manual operation in case of an emergency were the prime design criteria. The control valve consists of three major components; the first component is a compensator section and the other components are three or more electro-hydraulic proportional valve segments and an outlet section. Design criteria and advantages of using these concepts in typical, mobile hydraulic circuits are discussed. Attention is paid to the control valve's pressure compensation section, electro-hydraulic flow control segment, the control valve's driver stage or low-power electro-magnetic device, pilot stage features where contamination insensitivity and positional feedback are important, ease of over-ride operation and field flushing, operation of the control valve's electro-hydraulic segment, and typical mobile hydraulic circuits and calculations of horsepower loss.

Presented at SAE Off-Highway Vehicle Meeting and Exposition, Milwaukee, Wisconsin, 11-14 September 1978.

SAE 780747
HS-025 572U

11 p.

1978

SAE Technical Paper Series

Design; Flow control (Air traffic control); Valves

Design criteria

Design; Safety and Human Factors

HSL

Aug 31 1985 12:00AM