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Quote From The CDL Manual: Shut-off valves (also called “cut-out cocks”) are used in the service and supply air lines at the back of trailers used to tow other trailers. These valves permit closing the air lines off when another trailer is not being towed.
Where are shut off valves located?
Crawl-space with no basement – the shut-off valve typically is located near the water heater or under the kitchen sink, but anywhere is possible. If it is located inside the crawl space, you may want to consider a second valve located in the living space, for example, near the water heater or under a sink.
Which shut off valves should be open and which should be closed CDL?
The rear shut-off valves should be open. All shut-off valves should be in the open position, except the rear shut-off valves.
What is a shut off valve on a trailer?
Explanation Shut-off valves are used in air supply lines to control the passage of air from one trailer to another.
What are shut off valves?
Shutoff valves are designed to control the flow of water and other materials with either full on and full off functionality or at a specific flow rate. These valves are utilized in residential, commercial, and institutional applications for handling liquids, gases, and slurry.
Where is the outside water shut off valve?
Finding the Water Shut-off Valve Look for a rectangular or round cover that will be near the edge of your property, often between the curb and the sidewalk. Some water main valves are located along an alley, rather than the street. Open the cover to the meter to find the water shut-off valve.
Where is the main water shut off valve outside?
If the water main shut off valve is located outside, it will be buried underground near the street. Look for a round or rectangular metal cover flush with the grass or sidewalk. It might be labeled “water meter” to help you identify it. Under this cover is the water shut off valve.
Where are the shut-off valves on a semi truck?
Quote From The CDL Manual: Shut-off valves (also called “cut-out cocks”) are used in the service and supply air lines at the back of trailers used to tow other trailers. These valves permit closing the air lines off when another trailer is not being towed.
Should the shut-off valves on the rear of the last trailer be open or closed?
Open the emergency line shut-off valve at the rear of the last trailer. You should hear air escaping, showing the entire system is charged. Close the emergency line valve.
Where is the water shut off valve in a trailer?
Mobile homes may have two shutoff valves. One may be located beneath the home near the back, where the water main is connected. If you spot a gate valve or ball valve here, it is a main water shutoff valve.
Where is the trailer hand valve?
Often, a hand valve is also fitted on the steering column or the instrument panel of the towing vehicle so the driver can apply the trailer service brakes independent of the towing vehicle’s brakes.
What are shut off valves used for CDL?
Shut-off valves (also called cut-out cocks) are used in the service and supply air lines at the back of trailers used to tow other trailers. These valves permit closing the air lines off when another trailer is not being towed.
How does an emergency shut off valve work?
The shut-off valve for emergency situations is located near where the water main enters your home, close to the manual valve you can use to shut off the water flow yourself. The valve automatically closes to stop continued water flow and prevent more water damage.
Where is the main gas shut off valve?
Your main shut off valve is located just before the gas meter. This is called your “street side valve”. On the inside of your house, where the pipe enters your house, you can find your “house side valve.” This ball valve is attached to a black iron pipe.
How do I turn the water off outside?
Your home’s outdoor water shut-off valve is usually located near the ceiling, on the inside of the wall where the outdoor faucet is located. If the outdoor shut-off valve is tap- or knob-style, turn it clockwise, or to the right, to shut it off (remember: righty-tighty, lefty-loosey).
How can you test the tractor protection valve CDL?
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.
How can you test that air flows to all trailers CDL?
How can you test that air flows to all trailers? Use parking brake and/or chock wheels. Wait for normal air pressure, then push “trailer air supply” knob. You just studied 5 terms!.
Which knob controls your tractor spring brakes?
The parking brake controls the spring brakes on the tractor. When you pull the knob out, it causes the trailer supply valve to pop out, applying both the tractor and trailer parking brakes.
Should the shut off valves on the middle trailer be open or closed?
When pulling two or more trailers, the shut off valves on the first trailer should be in the following positions: The service line should be closed and the emergency line should be open. Both the service line and the emergency line should be open.
Why should you pull a dolly out from under?
Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? The dolly tow bar may fly up, possibly causing injury, and making it very difficult to re-couple. 1) If spare tire is carried on converter gear (dolly), make sure it’s secured.
