Fabbrica Italiana Magneti Marelli, S.p.a.

Bruno Zoppi

A valve to shut off leakage from a damaged section of a pneumatic braking system: the valve comprises a spring biased movable shutter which is spring biased against a fixedly positioned annular seat and a second annular seat coaxial with the first annular seat; the second annular seat is spring biased to move a controlled maximum distance toward the shutter; a plenum defined between the first and second seats and the shutter; a small flow rate leakage passage from the high pressure concuit into the plenum. Pneumatic pressure enters the plenum and raises the shutter off the fixed valve seat while the movable valve seat follows the motion of the shutter and finally the shutter lifts off the movable valve seat, also; upon leakage, the shutter re-engages the movable and then the fixed valve seats. A valving assembly including the aforesaid valve plus other valves in the passages leading to the aforesaid valve, and each of these valves servicing a unit of the braking system.

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Milan, Italy

Bruno Zoppi