Generator motor flow control valve

A flow control manifold apparatus for use with a hydraulic drive motor, wherein the flow control manifold apparatus receives a supply of high pressure hydraulic fluid and delivers a constant flow of the high pressure hydraulic fluid to a drive motor, the flow control manifold apparatus comprising:

• a) a manifold housing defining a first flow path from a flow input port to a flow output port, wherein said flow input port is fluidly coupled to the supply of high pressure hydraulic fluid and said flow output port is fluidly coupled to said drive motor and a second flow path from a return inlet port to a return outlet port, wherein said return inlet port is fluidly coupled to said drive motor and said return outlet port is fluidly coupled to the supply of high pressure hydraulic fluid;
• b) a first flow regulating valve inline said first flow path to regulate a flow rate of the high pressure hydraulic fluid through said flow output port to said drive motor;
• c) a pilot operated relief valve circuit comprising:
• i) an excess flow path fluidly coupling said first flow path to said second flow path;
• ii) an excess pressure valve inline said excess flow path wherein said excess pressure valve is configured to be in a closed orientation when said first flow regulating valve is open whereby all of the high pressure hydraulic fluid exits through said flow output port to said drive motor, and wherein said excess pressure valve is configured to be in a partially open orientation when said first flow regulating valve is partially closed whereby a first portion of the high pressure hydraulic fluid exits through said flow output port to said drive motor and a second portion of said high pressure hydraulic fluid exits through said return outlet port to the supply of high pressure hydraulic fluid;
• and
• iii) a relief valve, wherein when a fluid pressure of said high pressure hydraulic fluid exceeds a predetermined threshold, said relief valve causes said excess pressure valve to open to direct fluid through said return outlet port to the supply of high pressure hydraulic fluid;
• and
• d) a spin down flow path coupling said first flow path to said second flow path downstream said first flow regulating valve, wherein said spin down flow path includes a first check valve configured to open when a return fluid pressure of the fluid entering said return inlet port from said drive motor is greater than a flow fluid pressure of the fluid exiting said flow output port to said drive motor.