- Special Notes
- Product Description
- Manufacturer: Bendix
- Part Number: 800479
- Condition: New
- Crack pressure: 4 psi
- Delivery ports: 1/2" NPT
- Includes mounting bracket
Cross References: 800479, 060-800479, 5004631, BW800479, 745-800479, BEN800479, BX800479,
800479BXW, ZAC800479, TWDBEN800479
A cross reference listing means that this item should be a suitable replacement
for the part numbers listed. You should check the description to be sure it will work in your application.
Relay valves are primarily used on vehicles to apply and release rear axle(s) service or parking brakes.
When the driver applies the brakes, air travels through the delivery (in this case signal) line to
the relay valve and moves an internal piston down. This closes the exhaust and opens the delivery
of air to the brakes. The primary benefits of using a relay valve is that the high capacity of air
needed for braking is delivered directly and does not have to travel up to the brake valve and then
all the way to the brakes. The brake force is adjustable and when released the relay valve exhausts
to atmosphere. Relay valves are generally mounted close to the chambers they serve and are available
in both remote and reservoir mount designs.