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.

  • Availability:
  • Supplemental Notes:
    • Presented at SAE Off-Highway Vehicle Meeting and Exposition, Milwaukee, Wisconsin, 11-14 September 1978.
  • Corporate Authors:

    Society of Automotive Engineers (SAE)

    400 Commonwealth Drive
    Warrendale, PA  United States  15096
  • Authors:
    • Patel, K
  • Publication Date: 1978

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00399004
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: SAE 780747, HS-025 572U
  • Files: HSL, USDOT
  • Created Date: Aug 31 1985 12:00AM