Air pressure control in a hot melt liquid dispensing system

A hot melt liquid dispensing system, comprising:

• a pump configured to pump hot melt liquid to an applicator;
• an air flow path configured to supply pressurized air to the pump;
• an electronic pressure sensor associated with the air flow path;
• a pressure control assembly that includes a transducer and is configured to control an air pressure in the air flow path supplied to the pump wherein the transducer is configured to cause adjustment to an air pressure of the air flow path, wherein the transducer is configured to provide a pneumatic output to the air flow path that is proportional to an electronic signal that is transmitted to the transducer, whereby the transducer is configured to output adjusted air to the pump via the air flow path, and wherein the transducer comprises at least one of a current-to-pressure transducer or a voltage-to-pressure transducer;
• a pressure discharge valve;
• and
• a controller configured to:
• receive an electronic signal from the electronic pressure sensor indicative of the air pressure in the air flow path,
• cause adjustment to the air pressure in the air flow path based on the electronic signal from the electronic pressure sensor by transmitting an electronic signal to the pressure control assembly, wherein the controller causes adjustment to the air pressure in the air flow path by transmitting an electronic signal to the transducer,
• wherein the electronic pressure sensor is positioned in the air flow path downstream from the transducer, wherein a regulator of the pressure control assembly is configured to adjust pressure of an unregulated input air supply and output a regulated air supply to the pump via a first air line and a second air line,
• wherein the regulator and the transducer are each spaced from the pump,
• wherein the first air line is configured to fluidly connect the regulator to the pressure discharge valve, and
• wherein the second air line is configured to fluidly connect the regulator to the pump.