9732980050 is a genuine Wabco relay valve with a 1:1 regulating ratio and a 3.92 psi opening pressure, sold by Pro Gear and Transmission. A relay valve acts as a switch for the air brakes: when the driver presses the pedal, the control signal opens the valve and air flows on to the brake chambers, and on release it exhausts that air so the brakes reset for the next stop.
It is rated for a maximum operating pressure of 159.54 psi across a -40°C to +94°C temperature range, with dry seal NPTF ports. Brakes that are slow to engage or wear unevenly are typical signs of a tired relay valve.
Features
Relay valve with 1:1 regulating ratio
Opening pressure 3.92 psi, maximum operating pressure 159.54 psi
Three dry seal NPTF ports
Operating temperature range -40°C to +94°C
Compact body, 105 x 105 x 97 mm
Slow brake engagement or uneven brake wear can point to a worn relay valve
Tech Specs
- Version: Pressure reduction
- Regulating ratio: 1:1
- Opening pressure: 3.92 psi
- Max. operating pressure: 159.54 psi
- Temperature range: -40°C to +94°C
- Port thread 11/2" - 14 Dry Seal NPTF
- Port thread 21/2" - 14 Dry Seal NPTF
- Port thread 41/4" - 18 Dry Seal NPTF
- Exhaust: Snap-on contour JED - 463
- Mounting: 2x 24.5x10 mm
- Calculated volume: 1.069 dm³
- Size (mm x mm x mm): 105 x 105 x 97
- Technical specification: OE specification
