What does a pressure protection valve do?
Protects the air brake system in the event of a leak or failure within the air suspension system. Premium Valve has a serviceable replacement filter that minimizes contaminants and other debris from entering other air system accessories.
What is a tractor protection valve on a semi?
The tractor protection valve protect the tractors air supply from being depleted in the event of a trailer breakaway. Any truck or tractor designed to pull a trailer fitted with air brakes will be equipped with a tractor protection system.
Where is the tractor protection valve located?
A tractor protection valve (Fig. 38) is usually mounted on the cab or chassis of the tractor. When the trailer-supply valve is open, air passes through the bottom of the tractor protection valve and charges the trailer through the supply line (also called the emergency line).
How do you test the tractor protection valve?
Explanation You should test the tractor protection valve by allowing the air supply to properly charge, turning off the engine, then releasing air from the system by pressing the brake pedal several times. The tractor protection valve should move into its emergency position when psi drops to an unsafe level.
What controls the tractor protection valve?
trailer air supply
The tractor protection valve is controlled by the “trailer air supply” control valve in the cab. The control valve allows you to open and shut the tractor protection valve. The tractor protection valve will close automatically if air pressure is low (in the range of 20 to 45 psi).
What PSI should a tractor protection valve be set at?
Although the red button may trip at the specified pressure interval, it’s more common for it to trip instantaneously at 100-130 psi to protect the tractor service braking system.”
What is the Blue Knob for in a semi?
The yellow one controls brakes on all axles, the red is only for trailer, and the blue is only for the truck unit. It actually helps to have that blue one, because in winter time you’d want to have the trailer brakes released so that the residue water doesnt freeze in the air lines.