| 主权项 |
1. A flow divider valve for controlling fuel flow to a gas turbine engine that includes a start nozzle manifold and a run nozzle manifold, the flow divider valve comprising:
a valve body including an inlet port, a start nozzle manifold outlet port, a run nozzle manifold outlet port, and an inner surface that defines a valve chamber; a start flow orifice disposed between the inlet port and the start nozzle manifold outlet port; and a flow divider valve element disposed within the valve chamber and movable therein between a closed position and a plurality of open positions, the flow divider valve element including an inner surface, an outer surface, and a flow regulation port, the inner surface defining an internal channel, the flow regulation port extending through the flow divider valve element between the inner surface and the outer surface and providing continuous fluid communication between the internal channel and the run nozzle manifold outlet port when the flow divider valve element is in the plurality of open positions; wherein the flow divider valve element is configured such that:
when the flow divider valve element is in the closed position, the inlet port is fluidly isolated from the start nozzle manifold outlet port, the run nozzle manifold outlet port, and the internal channel, andwhen fuel pressure at the inlet port is between a first predetermined pressure and a second predetermined pressure:
the flow divider valve element is in one or more of the open positions and the inlet port is in fluid communication with (i) the start nozzle manifold outlet port via the start flow orifice and (ii) the run nozzle manifold outlet port via the internal flow channel and the flow regulation port, andfuel flow through the start flow nozzle manifold outlet port is substantially constant regardless of fuel flow into the inlet port; and wherein:
the valve body and flow divider valve element are configured to define, within the valve chamber, an inlet chamber, a run nozzle manifold chamber, and a start nozzle manifold chamber,the start nozzle manifold chamber is in fluid communication with the inlet chamber, via the start flow orifice, regardless of flow divider valve element position,the run nozzle manifold chamber is in fluid communication with the inlet chamber, via the internal flow channel and the flow regulation port, when the flow divider valve element is in the plurality of open positions, andthe start nozzle manifold chamber and the run nozzle manifold chamber are in fluid communication with each other when fuel pressure at the inlet port exceeds the second predetermined pressure. |
