Patent ID: 7726344

Claim:
A device for the dynamic control of a flow comprising, in a body, an inlet fitting, an inlet chamber, an outlet chamber, a piston, which is arranged between the inlet chamber and the outlet chamber and can be moved between a first position, which is displaced to the inlet chamber, wherein the piston constricts the flow between the inlet chamber and the outlet chamber when in the first position, and a second position, which is displaced to the outlet chamber, wherein the piston does not constrict the flow between the inlet chamber and the outlet chamber when in the second position, and a return spring, which acts upon the piston to move it to the first position, wherein the inlet chamber is at least partly ring-shaped and encloses the piston, the piston comprises a cylindrical shell section arranged in the area of the inlet chamber and a transverse segment, which defines a intermediate chamber and is crossed by an axially limited passage; a flow-limiting means is arranged between the inlet fitting and the intermediate chamber, wherein the axially limited passage and the return spring are proportional to one another so that the effect of the spring is essentially equal to the force that acts to shift the piston out of the first position and into the second position, when the maximum flow allowed by the flow-limiting means is discharged, and the intermediate chamber in the body of the device is bordered by an inlet fitting in which an inlet chamber is defined and which features a transverse wall in which axial circumferential passages are formed, which open in the ring-shaped inlet chamber, which encloses the piston, while the flow-limiting means is installed in the center of the transverse wall.