AND-type control valve for a tractor-trailer braking system

Details AND-type control valve for a tractor-trailer braking system AND-type control valve for a tractor-trailer braking system

1991-11-14

1993-03-02

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Multiple fluid-receiving devices

Multiple motors

137111, 137112, 188 3H, 188 16, 188354, 303 961, 303 841, 235201ME, B60T 1120

Patent

active

051903563

ABSTRACT:
An AND-type control valve useful in a vehicle braking system to prevent application of the vehicle brakes when only the right-hand or left-hand vehicle brakes are applied for the purpose of steering the vehicle. The control valve has two input flowpaths corresponding to the hydraulic braking circuit on different sides of the vehicle and a control output port for connection to the vehicle brake valve. Each input flowpath contains a non-return valve having associated therewith a flow sensitive device to provide a restricted flowpath which gives rise to a pressure drop which will tend to close or assist in closure of the non-return valve. A device is provided to prevent simultaneous closure of both non-return valves.

REFERENCES:
patent: 1409116 (1922-03-01), Sammis
patent: 2354791 (1944-08-01), Boldt
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patent: 2847182 (1958-08-01), Mancusi, Jr.
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patent: 3338257 (1967-08-01), Ferguson
patent: 3500853 (1970-03-01), Freeman
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patent: 3889711 (1975-06-01), Hirao
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patent: 4205700 (1980-06-01), Bouteille et al.
patent: 4253481 (1981-03-01), Sarlls, Jr.
patent: 4261381 (1981-04-01), Geiling

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