Vacuum advance regulating valve

A valve to prevent atmospheric contamination which automatically regulates the vacuum advance of the distributor in internal combustion engines, in which is included a passage which communicates a vacuum connection of the carburetor with a vacuum advance mechanism of the distributor, characterized in that it includes a conduit having two terminals, one of which is connected to the vacuum connection of said carburetor, and the other one is connected to the vacuum advance mechanism of the distributor, and in that the referred conduit can be obstructed by a valve closing element connected to a diaphragm confined between two principal bodies, one of which comprises said conduit and the other one is composed of a tubular body with inside threading which houses a spring that presses with one of its ends against the diaphragm and with the other end beasing against the lower portion of a threaded nipple, which screws into said inside threaded portion of said tubular body;

• said threaded nipple comprising a lengthwise bore which extends through a tube which by means of a hose is connected to the intake manifold of the carburetor, permitting the opening of the valve when the engine is working without load.