Vacuum limiting arrangement

Details Vacuum limiting arrangement Vacuum limiting arrangement

1985-12-02

1987-03-24

Nilson, Robert G.

Fluid handling

Self-proportioning or correlating systems

Self-controlled branched flow systems

123409, 123568, 137907, G05D 1606

Patent

active

046517669

ABSTRACT:
A vacuum limiting arrangement uses a three-port, two-position valve in conjunction with a vacuum sustaining valve to limit the vacuum applied to a vacuum driven device. A source of vacuum, such as engine intake manifold vacuum, is connected to one of two end ports. The device is connected to a central port, and the other end port is vented. The device can thus be connected either to the vacuum source in one position of the control valve or to vent. A control port that is effective to switch the control valve is connected into a vacuum line between the control valve and the device. The sustaining valve allows free flow of air from the device to the control valve, but only a restricted flow in the opposite direction to provide a hysterises to the system for controlling the shifting of the control valve, which is accomplished automatically as a function of the vacuum level at the device and in the control port.

REFERENCES:
patent: 2950730 (1960-08-01), Svensson
patent: 3606871 (1971-09-01), Gropp
patent: 4106452 (1978-08-01), Mizutani
patent: 4195605 (1980-04-01), Weathers et al.
patent: 4359034 (1982-11-01), Mase et al.

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