Fluid-pressure and analogous brake systems – Automatic – Equalizing valves
Patent
1982-09-08
1986-02-18
Reger, Duane A.
Fluid-pressure and analogous brake systems
Automatic
Equalizing valves
303 37, B60T 1522
Patent
active
045710082
ABSTRACT:
A control valve arrangement adapted to produce and maintain a pilot signal comprises a number of standard modules. The basic element has two standard modules, each of which includes a diaphragm-controlled on-off valve. An input signal is applied to a first valve against a reference pressure such that when the valve is on, a signal is generated and held as a pilot pressure. A second valve responds to a fall in input signal pressure to cancel out pilot pressure. The two valves together constitute a bistable operator. A particular use of this operator is in a railway braking system in which the first valve is used as an application valve and the second valve is used as a release valve. A third module may be used as a pilot pressure-maintaining valve. The pneumatically-operated diaphragm assembly shown in FIG. 1, comprises three modules, 1, 2 and 3. Module 1 is the brake application module, module 2 is the release module and module 3 is an optional pilot pressure-maintaining module. Each module includes a ball valve 8, 21, 30, operated by respective diaphragms 5, 19, 26. Modules 1 and 2 act as a bistable operator producing the pilot pressure and module 3 acts to maintain the pilot pressure.
REFERENCES:
patent: 4161340 (1979-07-01), Hart
patent: 4169490 (1979-10-01), Taplin
patent: 4339155 (1982-07-01), Hart
Oberley Alvin
Reger Duane A.
Westinghouse Brake & Signal Company
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