Digital closed loop proportional hydraulic pressure controller

A current to pressure converter (CPC), comprising:

• a housing defining a control port, a supply port, and a drain port fluidly coupled therethrough;
• a digital controller, configured to reduce the effects of thermal drift, enclosed within said housing;
• a 3-way rotary valve configured to alternatively couple the control port with the drain port, the supply port, or neither the drain port or supply port;
• a limited angle torque rotary actuator operatively coupled to the digital controller and drivably coupled to the 3-way rotary valve;
• and
• a pressure transducer in fluid communication with the control port, the pressure transducer providing pressure feedback to the digital controller;
• wherein the digital controller is configured to control the pressure supplied by the control port in proportion to an input analog control signal of 4-20 mA;
• and
• wherein the digital controller is configured to diagnose input signals to determine reasonableness thereof for use in controlling a position of the 3-way rotary valve.

A current to pressure converter (CPC), comprising:

• a housing defining a control port, a supply port, and a drain port fluidly coupled therethrough;
• a digital controller;
• a 3-way rotary valve configured to alternatively couple the control port with the drain port, the supply port, or neither the drain port or supply port;
• a rotary actuator operatively coupled to the digital controller and drivably coupled to the 3-way rotary valve;
• and
• wherein the digital controller is configured to periodically impart an anti-silting impulse to the 3-way rotary valve.