combination valve

[1] A brake system hydraulic control device includes a pressure differential valve, metering valve, and proportioning valve
[2] A hydraulic valve usually incorporating a pressure differential warning switch, a metering valve and a proportioning valve. Not all combination valves contain all of these control valves
[3] A pressure-regulating valve in braking systems incorporating a failure warning switch and comprising two or more of the following valves: pressure-differential valve, metering valve, and proportioning valve.

Dictionary of automotive terms. 2015.

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