Two-stage valve

Details Two-stage valve Two-stage valve

1992-09-16

1993-08-10

Look, Edward K.

Power plants

Pressure fluid source and motor

Pulsator

60581, 60588, B60T 1108

Patent

active

052338355

ABSTRACT:
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.

REFERENCES:
patent: 4072012 (1978-02-01), Kawakami
patent: 4455831 (1984-06-01), Maehara
patent: 4732001 (1988-03-01), Belart
patent: 4738109 (1988-04-01), Miller et al.
patent: 4963692 (1990-10-01), Halabiya

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