Tractor protection valve – SGI
When the trailer-supply valve is open, air passes through the bottom of the valve and charges the trailer, while spring pressure closes the service line port to protect the application air pressure in the truck.
How is the tractor protection valve operation?
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 known as the emergency line), and the tractor protection valve’s service line port opens when the pressure in the supply line reaches 45 psi.
What’s the purpose of a tractor protection valve?
The tractor protection valve keeps air in the tractor or truck brake system if the trailer breaks away or develops a leak in a combination vehicle with air brakes.
What happens when the tractor protection valve closes?
When the tractor protection valve closes, it prevents any air from leaving the tractor and lets air out of the trailer emergency line, causing the trailer emergency brakes to engage, potentially resulting in a loss of control. (Emergency brakes will be discussed later.)
What is another name for the tractor protection valve?
Any truck designed to tow a trailer with air brakes will have a tractor protection system, which consists of the tractor protection valve–just to confuse you [CHCUCKLING], the system and the valve are the same thing–and the red, eight-sided trailer air supply valve.
Where are the shut off valves on a tractor trailer?
Shut-off Valves These valves allow you to shut off the air lines when another trailer isn’t being towed; make sure all shut-off valves are open, except those at the back of the last trailer, which must be closed.
What color is the tractor protection valve?
The TSV, also known as a ‘towing vehicle’ protection valve, is controlled by the driver and has a red colored, eight-sided knob. The driver opens (pushes in) the TSV when a trailer is being towed and closes it (pulls out) when no trailer is present.
What color is the tractor air supply valve?
The tractor protection valve is controlled by the trailer air supply control, which is a circular orange knob on older vehicles and an eight-sided red knob on newer vehicles.
At what pressure must the tractor protection valve operate to pass inspection?
Breakaway and emergency braking are addressed in Title 49, Section 393.43, which establishes an “explicit requirement that the tractor protection valve or similar device operate when the air pressure u2013 both primary and secondary reservoirs u2013 on the towing vehicle is between [20 and 45 psi].”
What keeps the air in the tanks?
The one-way check valve keeps the air in the tank if the air compressor develops a leak. Air brakes take longer to activate than hydraulic brakes because air takes longer to flow through the lines.
What is the function of a trailer pressure protection valve?
In the event of a leak or failure in the air suspension system, the air brake system is protected.
What is the purpose of a tractor?
Tractors are agricultural machines that can be used to pull a variety of farm implements for plowing, planting, cultivating, fertilizing, and harvesting crops, as well as hauling materials and personal transportation.
What position should the tractor protection valve?
The tractor protection valve is situated beneath the tractor’s frame, where the flexible airlines leading to the trailer are connected by glad hands coupling devices.
Which valve keeps air in the tractor or truck if the trailer breaks away or develops a bad leak?
The tractor protection valve closes and keeps air in the tractor or truck if the trailer breaks away or develops a bad leak. The tractor protection valve is controlled by the trailer air supply control in the cab, which allows you to open and shut the tractor protection valve.
When not pulling a trailer Why is it a good idea to lock the glad hands together or to a dummy coupler?
When you’re not towing a trailer, why should you lock the tractor glad hands (or dummy couplers) to each other? A The connected brake circuit acts as a backup air tank. B If you didn’t, you’d never be able to build system pressure.