Egr modulating valve

EGR MODULATING VALVE

The vacuum coming from the vacuum pump for the brake servo reaches the chamber (E) from the duct (F) (case I), because the force of the spring (6) acts on the moving element (4) and the valve (5) allows its passage.

The vacuum then affects the chamber (B), through the compensation port (D) and the surface of the shutter (3).

When the forces acting on the disc (3) are in equilibrium, the atmospheric pressure in the duct (A) enters the chamber (B), moving the moving element downwards (case II), so that the valve (5) shutter closes the duct (F) and places chamber (E) in contact with chamber (C) at atmospheric pressure, decreasing the value of the vacuum in the duct (E).

The decreased vacuum value or the increase in the absolute pressure in the chamber (E) raises the moving element (4) (case I), closing the passage (C) and placing the valve (5) in the ideal condition (E in contact with F) and the cycle is repeated.