Inverse proportional pressure relief valve

A hydraulic system comprising:

• a source of fluid;
• a tank;
• and
• a valve having a first port fluidly coupled to the source of fluid, and a second port fluidly coupled to the tank, wherein the valve comprises:
• a pilot seat member comprising:
• (i) a channel that is fluidly coupled to the first port of the valve, (ii) a pilot seat, and (iii) one or more cross-holes fluidly coupled to the second port of the valve,
• a pilot check member configured to be subjected to a fluid force of fluid in the channel of the pilot seat member acting on the pilot check member in a proximal direction,
• a solenoid actuator sleeve comprising a chamber therein,
• a first setting spring disposed in the chamber within the solenoid actuator sleeve and configured to bias the solenoid actuator sleeve in a distal direction, and
• a second setting spring disposed about an exterior peripheral surface of the solenoid actuator sleeve and configured to bias the pilot check member in the distal direction, such that the first setting spring and the second setting spring cooperate to apply a biasing force in the distal direction on the pilot check member toward the pilot seat against the fluid force.

A valve comprising:

• a housing having a longitudinal cylindrical cavity therein and having one or more cross-holes disposed in an exterior peripheral surface of the housing;
• a main sleeve disposed, at least partially, in the longitudinal cylindrical cavity of the housing, wherein the main sleeve includes a first port at a distal end of the main sleeve and includes one or more cross-holes disposed on an exterior peripheral surface of the main sleeve, wherein the one or more cross-holes of the housing and the one or more cross-holes of the main sleeve form a second port;
• a piston disposed within the main sleeve and configured to be axially movable therein, wherein the piston comprises a main chamber therein, wherein the main chamber of the piston is fluidly coupled to the first port;
• a pilot seat member comprising:
• (i) a channel that is fluidly coupled to the first port of the valve, (ii) a pilot seat, and (iii) one or more cross-holes fluidly coupled to the second port of the valve, wherein the main chamber of the piston is fluidly coupled to the channel of the pilot seat member;
• a pilot check member configured to be subjected to a fluid force of fluid in the channel of the pilot seat member acting on the pilot check member in a proximal direction;
• a solenoid actuator sleeve comprising a chamber therein;
• a first setting spring disposed in the chamber within the solenoid actuator sleeve and configured to bias the solenoid actuator sleeve in a distal direction;
• and
• a second setting spring disposed about an exterior peripheral surface of the solenoid actuator sleeve and configured to bias the pilot check member in the distal direction, such that the first setting spring and the second setting spring cooperate to apply a biasing force in the distal direction on the pilot check member toward the pilot seat against the fluid force.