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To regulate the pressure to a pre-determined amount.
A valve in the brake system which houses portioning valve metering and pressure differentional valve
the brake control valve is used to control the amount of hydrauic pressure form the hydraulic system to the brake system through the metering valve.
The purpose of a pressure relief valve in a geyser is to release the pressure created inside due to evaporation of water.
it controls the pressure
It is used to equalizer the brake pressure from front to back. So that when you hit the brakes they all work at the same time and one does not grab before the other.
the valve on the rear brake line is to limit brake force on the rear ie.loaded full pressure,empty reduced pressure to stop the rear brakes locking.
faster release of service brake
QR1 valve is the brake valve to the steer axles. Follow the service lines from the brake chambers to where they intersect, and that's the valve they're both attached to. It meters air to the brake chambers and also governs air pressure in the brake chambers.
To regulate the pressure to a pre-determined amount.
It will be mounted to a pressure port on the service (foot) brake valve
There are pressure regulator valves that exist. The purpose of these pressure regulator valves is to cut off the flow of a liquid or gas when the pressure within the valve reaches a certain level.