| 摘要 |
A protective device for a hydraulic system includes a block which forms a housing with at least one fluid flow inlet into the housing and at least one fluid flow outlet. A plurality of fluid flow channels within the housing connect the inlet and the outlet. Each of the fluid flow channels contain a hydraulic fuse adapted to close its associated fluid flow channel when a selected flow rate of hydraulic fluid is exceeded, each of the fuses having a different selected fluid flow rate which causes closure thereof. A valve in each of the fluid flow channels provides for selectively opening and closing the fluid flow channels so that a selected one of the channels is open and all others of the channels are closed. The valves may be integral with single rotatable valve stems, or of various alternative designs, for example, maunually, mechanically or electronically controlled valves.
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