Integrated firefighting fluid supply mechanism and methods thereof

An additive supply system for a fire fighting mechanism, comprising:

• an additive supply line connected to an additive source with a fire fighting fluid line;
• a balanced pressure valve capable of throttling a recirculating line, the balanced pressure valve is connected to an orifice tube and the recirculating line;
• a high pressure sensor, a low pressure sensor and the recirculating line connected to the orifice tube;
• an additive pump comprising an additive pump controller, the additive pump connected to the additive supply line;
• and
• a controller comprising a processor and computer-readable instructions that when executed by the processor, cause the processor to:
• determine a high pressure outputted by the high pressure sensor;
• determine a low pressure outputted by the low pressure sensor;
• determine an additive pump displacement outputted by the additive pump controller;
• and
• control the additive pump to adjust a flow from the additive pump based on one or more of the high pressure outputted by the high pressure sensor, the low pressure outputted by the low pressure sensor and the additive pump displacement outputted by the additive pump controller;
• wherein, when the system is in use, a portion of an additive pumped around the additive pump is capable of being recirculated through the recirculating line to balance pressure between a portion of the additive supply line and a portion of the fire fighting fluid line, and
• wherein the controller varies a rate of change of the flow of the additive pump based on one or more of the high pressure outputted by the high pressure sensor or the low pressure outputted by the low pressure sensor such that when changing the rate of change of the flow such that the rate of change is non-zero, a first magnitude of a first rate of change of the flow at a first time is different than a second magnitude of a second rate of change of the flow at a second time.