Patent ID: 8739825

Claim:
A hydraulic fuse, comprising: a housing with an inflow and an outflow; a closing element mounted in a movable manner in the housing with a front face facing the inflow and a closing surface facing the outflow; at least two flow channels extending from the inflow to the outflow; at least one orifice, arranged in the flow channels to create a pressure drop in a fluid flowing from the inflow to the outflow; and at least one retainer element arranged between the outflow and the closing element; wherein an inflow pressure of the fluid at the inflow acts on the front face of the closing element and an outflow pressure of the fluid at the outflow acts on the closing surface of the closing element; wherein the retainer element is dimensioned in such a way that, at a predetermined minimum difference between the inflow pressure and the outflow pressure, the closing element moves against a retaining force from the retainer element towards the outflow into a closing position; and wherein the hydraulic fuse further comprises at least one test closure for in-situ testing of the hydraulic fuse, the at least one test closure biased in an opening position, and the at least one test closure closes at least one of the flow channels in a closing position, so that the flow speed in the other flow channels is increased, the pressure drop through the orifice increases, and a movement of the closing element is thus induced.