Two-stage valve

Details Two-stage valve Two-stage valve

B - Operations, Transporting

60

T

B60T 11/28 (2006.01) B60T 11/224 (2006.01)

Patent

CA 2078349

A two-stage brake valve includes a stepped valve bore and pressure piston defining a first stage with a large effective area and a second stage with a smaller effective area. The two stages become effective in succession so that, initially the first stage is used to fill a system and then, following a transitional phase, the second stage generates an operating pressure. A relief channel communicates the pressure chamber of the first stage with a reservoir A relief valve closes the relief channel in response to an excess pressure generated by operation of the second stage.

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