Zero Emission Displacer-Based Liquid Level Control

A dump valve system for controlling the level of a liquid inside a vessel that includes a liquid discharge, the dump valve system comprising:

• an automatic dump valve connected downstream from the liquid discharge and configured to adjust the flow rate of the liquid through the liquid discharge;
• a float assembly, wherein the float assembly comprises:
• a float inside the vessel;
• and
• a float arm connected to the float;
• a level controller, wherein the level controller comprises:
• a linear position sensor assembly configured to output an electric signal;
• and
• an internal drive mechanism between the float arm and the linear position sensor assembly, wherein the internal drive mechanism translates a rotational movement of the float arm into a linear movement of the linear position sensor assembly;
• a flow meter configured to measure the flow rate of liquids discharged from the automatic dump valve and output a signal representative of the measured flow rate;
• and
• a control module, wherein the control module is configured to adjust the automatic dump valve to change a dump rate of fluids passing through the automatic dump valve based on the output from the linear position sensor assembly and the output from the flow meter.

A dump valve system for controlling the level of a liquid inside a vessel that includes a liquid discharge, the dump valve system comprising:

• an automatic dump valve connected downstream from the liquid discharge and configured to adjust the flow rate of the liquid through the liquid discharge;
• a float assembly, wherein the float assembly comprises:
• a float inside the vessel;
• and
• a float arm connected to the float;
• a level controller, wherein the level controller comprises:
• a housing;
• a primary shaft inside the housing, wherein the float arm is coupled to the primary shaft such that float arm pivots about the primary shaft;
• a linear position sensor assembly configured to output an electric signal, wherein the linear position sensor assembly comprises:
• a body;
• and
• a plunger that extends from and retracts into the body;
• and
• an internal drive mechanism between the float arm and the linear position sensor assembly, wherein the internal drive mechanism translates a rotational movement of the float arm into a linear movement of the linear position sensor assembly and wherein the internal drive mechanism comprises:
• a reaction linkage connected to and rotatable with the primary shaft;
• a torque bar pivotable about the primary shaft;
• a flapper bar in contact with the plunger of the linear position sensor assembly;
• and
• a sensitivity fulcrum positioned between the flapper bar and the torque bar.