×

Manually operated metering valve for a fuel control

  • US 4,368,618 A
  • Filed: 10/02/1980
  • Issued: 01/18/1983
  • Est. Priority Date: 10/02/1980
  • Status: Expired due to Term
First Claim
Patent Images

1. In a fuel management system having a primary metering valve and a secondary metering valve through which fuel from a source is supplied to an engine to meet a fuel flow requirement in response to an operational signal applied to a power lever, a transfer valve connected to the power lever for shifting from the primary metering valve to the secondary metering valve on movement of the power lever should a malfunction occur in the primary metering valve, the improvement comprising:

  • sensor means for detecting the malfunction to establish a transfer signal;

    control means responsive to said transfer signal for automatically transferring the fuel flow requirement from the primary metering valve to the secondary metering valve without moving the power lever when the fuel flow requirement is below a fixed level;

    a first cam connected to said power lever, said first cam having an operational surface with a first constant rise from a starting point;

    a second cam connected to said control means, said second cam having an operational surface with a constant drop from a starting point;

    linkage for connecting the first and second cams to provide said control means with an operational input corresponding with the fuel flow requirement;

    said control means includes a plunger having a cylindrical body with a first end and a second end, said first end having a stem extending therefrom, said cylindrical body having an annular groove located between the first and second ends, said first end being connected to receive said transfer signal and said second end being connected to a reference signal andfirst resilient means connected to said cylindrical body for urging said first end toward a first seat when fuel flow requirement is above the fixed level, said second cam engaging said stem to hold the first end away from the seat when the fuel flow requirement is below the fixed level.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×