Patent ID: 6991180

Claim:
A spray applicator for spraying a reaction mixture, comprising: a dispensing head in fluid flow communication with a plurality of material sources that each contain a material to be dispensed and having a control fluid circuit, the dispensing head having a mixing chamber and an outlet; a valve plate disposed in the dispensing head, the valve plate having a plurality of channels, wherein each of the material sources is in fluid flow communication with a supply channel, each of the supply channels having a valve seat; a plurality of rotatable valve elements, wherein one of the valve elements is disposed in each of the valve seats, a first group of the valve elements having a material dispensing port that has a dispensing position in which material is dispensed into the mixing chamber and a recirculating position in which material is recirculated, at least one of a second group of the valve elements having a dispensing position in which material is dispensed into the mixing chamber and a shutoff position; and that is operatively connected to the control fluid circuit at a first port and a second port; and wherein the control fluid circuit is connected to a plurality of actuators, wherein each of the valve elements has one actuator port and a second port, the control fluid circuit selectively pressurizes either the first port or the second port to arcuately shift one or more of the first plurality of valve elements between the dispensing position and the recirculating position and to arcuately shift the second group between the dispensing position and the shutoff position, wherein when the valve elements are in their dispensing position the material in the one material source to which its associated supply channel is connected is provided to the mixing chamber and then to the outlet.