Hose rupture valve

Claim 1

A hose rupture valve adapted to be located in a pressure fluid line and comprising a housing having inlet and outlet openings, a perforated flow restriction disc arranged within said housing substantially transversely of the flow direction of the pressure fluid through said housing between said inlet and outlet openings, a spring normally biasing said disc in a direction towards said inlet opening, said housing including a stop device for limiting the spring biased movement of said disc, said housing defining restricted by-pass passages around the outer peripheral edges of said disc, said disc being movable against the force of said biasing spring in a direction towards said outlet opening into abutment against a peripheral seat defined within said housing which surrounds and defines a flow cross section in the valve which is smaller than the area of said restriction disc to thereby close said valve in response to the condition when the inlet pressure exceeds the outlet pressure by more than a predetermined limit which is normally exceeded upon rupture of a hose connected to said outlet opening, said valve housing including means for adjustably varying the cross section of said by-pass passages to thereby determine the fluid flow rate through said by-pass passages at which the inlet pressure exceeds the outlet pressure by said predetermined limit to move said disc and close said valve, said means for adjustably varying the cross section of said by-pass passages comprising a blocking member which is movable in a plane extending transversely of the flow direction of the pressure medium to adjustably block the by-pass passages more or less in response to the transverse movement thereof.