Patent ID: 8561921

Claim:
A plural-component mixing system, comprising: a reservoir containing a first liquid component; a reservoir containing a second liquid component; a mixing assembly for mixing and applying the first and second liquid components; a supply system for supplying the liquid components from the reservoirs to the mixing assembly; a programmable logic controller connected to the supply system to control the supply system and record information about use of the system a first bleed valve associated with the first liquid component; a second bleed valve associated with the second liquid component; a first pressure sensor for sensing a pressure of the first component, the first pressure sensor being in communication with the programmable logic controller; a second pressure sensor for sensing a pressure of the second component, the second pressure sensor being in communication with the programmable logic controller; and wherein the programmable logic controller is programmed to compare the pressure at the first pressure sensor with the pressure at the second pressure sensor and to open the first bleed valve if the pressure at the first pressure sensor exceeds the pressure at the second pressure sensor by at least a specified amount and to open the second bleed valve if the pressure at the second pressure sensor exceeds the pressure at the first pressure sensor by at least the specified amount.