Patent ID: 8113486

Claim:
A component-feed nozzle for the use in a reaction mixing head of a reaction injection device, comprising: a housing having a component inlet and a component outlet; a closing and flow restriction member arranged in the housing and defining a first area and a second area which are exposed to a substantially same component pressure, wherein the first area, when acted upon by the component pressure, produces a force in opening direction, and the second area, when acted upon by the component pressure, produces a force in closing direction, wherein the first and second areas are sized such that the force in opening direction and the force in closing direction substantially offset one another; and an electric linear drive operatively connected to the closing and flow restriction member for moving the closing and flow restriction member between a first position in which the component outlet is closed and a second position in which the component outlet is open, thereby forming a flow communication between the component inlet and the component outlet, wherein the closing and flow restriction member has a flow channel which fluidly connects the component inlet with an action space and terminates in an outlet channel to generate a force in the opening direction as a result of the component pressure.