Milking machine claw

In a milk claw for milking machines, the combination of a housing forming a milk manifold and adapted for connecting said manifold to the teat cups of a milking machine, the housing having an outlet from said manifold, a valve for controlling said outlet and including a valve seat in the housing and a valve member coacting with said seat to open and close the valve, there being a leak opening which allows a small flow through said valve in the closed position thereof, and a pneumatic operating member structurally supported in the housing and connected to the valve for operating the same, said operating member comprising two flexible diaphragms which define between the diaphragms a working chamber separated from the milk manifold, one of said diaphragms having a larger area than the other diaphragm, both of said diaphragms being exposed outside said working chamber to the pressure in the milk manifold, whereby said operating member is actuated by variations in the difference between the pressures in said manifold and said working chamber.