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- Relay_valve abstract "A relay valve is an air-operated valve. It is used in air brake systems to remotely control the brakes at the rear of a heavy truck or semi-trailer in a tractor-trailer combination. Relay valves are necessary in heavy trucks in order to speed-up rear-brake application and release, since air takes longer to travel to the rear of the vehicle than the front of the vehicle, where the front service brakes, foot-valve, parking-control valve, and trailer-supply valve (if applicable) are located.Without relay valves, it would take too long for sufficient air to travel from the brake pedal valve to the rear of the truck or trailer in order to apply the rear service brakes concurrently with the front service brakes, resulting in a condition known as brake lag. To correct this condition on a long-wheel-base vehicle, a relay valve is installed near the rear service brake chambers. In tractors as well as straight-trucks, a remote air-supply is provided in the form of a small diameter pipe connected between the primary reservoir and the relay valve for remote service brake application.".
- Relay_valve wikiPageID "1494488".
- Relay_valve wikiPageRevisionID "603694427".
- Relay_valve hasPhotoCollection Relay_valve.
- Relay_valve subject Category:Valves.
- Relay_valve type BodyPart105220461.
- Relay_valve type Part109385911.
- Relay_valve type PhysicalEntity100001930.
- Relay_valve type Structure105225602.
- Relay_valve type Thing100002452.
- Relay_valve type Valve105395286.
- Relay_valve type Valves.
- Relay_valve comment "A relay valve is an air-operated valve. It is used in air brake systems to remotely control the brakes at the rear of a heavy truck or semi-trailer in a tractor-trailer combination.".
- Relay_valve label "Relay valve".
- Relay_valve sameAs m.055sq_.
- Relay_valve sameAs Q7310899.
- Relay_valve sameAs Q7310899.
- Relay_valve sameAs Relay_valve.
- Relay_valve wasDerivedFrom Relay_valve?oldid=603694427.
- Relay_valve isPrimaryTopicOf Relay_valve.