Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1990-06-26
1991-10-15
Look, Edward K.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
F15B 910
Patent
active
050564137
ABSTRACT:
In a valve housing (30) a first and a second valve seat (32, 34) are arranged to which a common valve body (40) can be applied. In one position of an actuating member (38) the valve body (40) is lifted only from the first valve seat (32), two chambers (24, 26) of the brake booster (10) thereby being connected together and both separated from an air inlet (50). In another position of the actuating member (38) the valve body (40) is lifted from the second valve seat (34), the two chambers (24, 26) thereby being separated from each other and one of them connected to the air inlet (50). The valve assembly (28) comprises an additional venting channel (80) which opens into the chamber (26) of the brake booster (10) adapted to be connected to the air inlet (50) and is controlled by an additional valve (66, 72). The additional valve (66, 72) is adapted to be opened by a movement of the actuating member (38) which exceeds the movement necessary for lifting the valve body (40) from the second valve seat (34).
REFERENCES:
patent: 3780620 (1973-12-01), Gardner
patent: 4587884 (1986-05-01), Tsubochi
patent: 4944214 (1990-07-01), Briggs
Look Edward K.
Lopez F. Daniel
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