Polyurethane component mixer - having chamber provided with double acting control piston operated by poly:ol component to dispense with auxiliary actuating fluid

摘要

Polyurethane component mixing device having a mixing chamber into which the components are directed by a control piston whose end facing away from the chamber is formed as an actuating piston has the component supply line provided with a multi-way valve which directs the component flow selectively to one or the other side of the piston to move the control piston into the closed or open position. Side of piston which is not acted upon by the component is vented to the component supply sump. Additional device control fluid e.g. hydraulic or compressed air is dispensed with.