Pneumatic booster with solenoid auxiliary control, particularly

Details Pneumatic booster with solenoid auxiliary control, particularly Pneumatic booster with solenoid auxiliary control, particularly

1995-02-03

1996-01-16

Lopez, F. Daniel

Motors: expansible chamber type

Working member position feedback to motive fluid control

Plural input signal means for single motor valve

91376R, F15B 1316

Patent

active

054838665

ABSTRACT:
In a booster housing (10) two chambers (12, 14) separated from each other by a movable wall (16) are connectable to each other by a control valve (20) having a valve body (22) axially movable in common with the wall (16), said valve body having a first valve seat (24), a sealing element (60) axially movable in said valve body and pretensioned in the direction of said first valve seat and a valve barrel (30). The valve barrel (30) has a second valve seat (32) and is pretensioned in the direction of the sealing element (60), is couplingly connected for movement by means of a piston (42) movable by an actuator element (44) in the direction away from the sealing element (60) and is movable by means of a solenoid (40) also independently of the piston (42). On the piston (42) a third valve seat (72) is formed spaced apart from the sealing element (60) by a distance (B) when valve barrel (30) and piston (42) are in rest position, but is in contact with the sealing element (60), thus preventing the inflow of air into the first chamber (12), when the actuator element (44) is released whilst the valve barrel (30) is maintained by the solenoid (40) in a position distant from the sealing element (60).

REFERENCES:
patent: 5172964 (1992-12-01), Levrai et al.

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