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- Relay_valve abstract "A relay valve is an air-operated valve typically 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 large diameter pipe connected between the primary reservoir and the relay valve for remote service brake application.In a truck’s air brake system, relay valves get a signal when a driver presses the treadle, which then opens the valve and allows air to enter the brake chamber via air inlet. The diaphragm gets pushed, then the rod, then the slack adjuster which twists to turn the brake camshaft. Next, it moves the disc, wedge or s-cam, which pushes the brake shoes and lining, creating friction. This friction slows and eventually stops the brake drum’s turning, which stops the wheel.".
- Relay_valve wikiPageID "1494488".
- Relay_valve wikiPageLength "8360".
- Relay_valve wikiPageOutDegree "12".
- Relay_valve wikiPageRevisionID "698367202".
- Relay_valve wikiPageWikiLink Air_brake_(road_vehicle).
- Relay_valve wikiPageWikiLink Car_controls.
- Relay_valve wikiPageWikiLink Category:Valves.
- Relay_valve wikiPageWikiLink Dashboard.
- Relay_valve wikiPageWikiLink Friction.
- Relay_valve wikiPageWikiLink Parking_brake.
- Relay_valve wikiPageWikiLink Pneumatics.
- Relay_valve wikiPageWikiLink Railway_air_brake.
- Relay_valve wikiPageWikiLink Semi-trailer.
- Relay_valve wikiPageWikiLink Semi-trailer_truck.
- Relay_valve wikiPageWikiLink Tractor.
- Relay_valve wikiPageWikiLink Transistor.
- Relay_valve wikiPageWikiLinkText "Relay valve".
- Relay_valve wikiPageWikiLinkText "relay valve".
- Relay_valve wikiPageUsesTemplate Template:Reflist.
- Relay_valve subject Category:Valves.
- Relay_valve hypernym Valve.
- Relay_valve type AnatomicalStructure.
- Relay_valve type Hydraulic.
- Relay_valve type Redirect.
- Relay_valve type Technology.
- Relay_valve comment "A relay valve is an air-operated valve typically 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 Q7310899.
- Relay_valve sameAs m.055sq_.
- Relay_valve sameAs Q7310899.
- Relay_valve wasDerivedFrom Relay_valve?oldid=698367202.
- Relay_valve isPrimaryTopicOf Relay_valve.