T: +8615609213525
E: 15829336298@139.com
E: 15829336298@139.com
Room 1212-G107, Unit 2, Building 1, Block A, Shenglong Plaza, No. 80 Weiyang Road, Weiyang District, Xi'an City, Shaanxi Province
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WG9000360524
Sinotruk HOWO
| Attribute | Description |
|---|---|
| Part Name | Relay Valve / Air Brake Relay Valve / Quick Release Valve |
| Common Names | Secondary Control Valve, Fast-Acting Relay Valve, Rear Axle Brake Control Valve |
| OE Number (Original Equipment) | WG9000360524 |
| Alternate OE No. | AZ9014360047 |
| Manufacturer | China National Heavy Duty Truck Group (Sinotruk / CNHTC), often co-developed with WABCO technology |
| Function | Amplifies brake signal pressure from the foot valve to rapidly supply or exhaust air to/from the rear brake chambers, significantly reducing brake response and release time |
| Valve Type | Pneumatically controlled 3-port relay valve with quick-release function |
| Mounting Location | Mounted near the rear axle(s), close to the spring brake chambers on the chassis frame |
| System Role | Acts as an "amplifier" between the brake control circuit and high-volume brake actuators |
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| Parameter | Specification |
|---|---|
| Maximum Working Pressure | 10 bar (≈145 psi) – Suitable for standard heavy vehicle air brake systems |
| Operating Medium | Clean, dry compressed air (oil-free preferred) |
| Port Configuration | • Port 1 (Supply In): From air reservoir (main tank) • Port 2 (Delivery Out): To brake chamber (service brake) • Port 3 (Exhaust): Atmosphere vent (quick release) • Port 4 (Control In): Signal from foot valve or ABS modulator |
| Connection Type | • M22×1.5 Voss Thread (for Ports 1, 2, and 4) • Snap-on Contour / Push-in Fitting (for Port 3 exhaust) |
| Body Material | High-strength die-cast aluminum alloy or low-carbon steel with anti-corrosion paint coating |
| Internal Components | Precision piston, rubber diaphragm, return spring, sealing rings (NBR or EPDM) |
| Weight | Approx. 2.5 kg (varies slightly by material variant) |
| Flow Capacity | High-flow design for rapid charging/discharging of large brake chambers |
| Protection Level | Resistant to dust, moisture, vibration, and mechanical impact |
| Quality Standards | Complies with ISO 9001, IATF 16949 (formerly ISO/TS 16949), GB/T standards |
| Service Life | Designed for over 1 million operational cycles under normal conditions |
⚠️ WARNING: Work involves high-pressure air systems. Ensure system is depressurized before servicing.
Park vehicle securely and apply parking brake.
Turn off engine and release all air pressure via manual drain valves.
Close isolation valve (if equipped) upstream of the relay valve.
Locate the relay valve near the rear axle brake chamber.
Clean surrounding area to prevent dirt entry.
Label each hose according to port number:
Port 1: Supply (from main reservoir)
Port 2: Output (to brake actuator)
Port 4: Control signal (from brake pedal or ABS unit)
Port 3: Exhaust (open to atmosphere)
Carefully disconnect all fittings using proper tools — do not pull hoses directly.
Unscrew mounting bracket bolts.
Gently remove the old valve — inspect for corrosion or damage on mounting surface.
Position new valve correctly (ensure exhaust port faces downward if possible).
Secure with original or compatible hardware.
Torque to ~10–15 N·m (avoid over-tightening aluminum housing).
Reattach lines to correct ports:
Use thread sealant (if required) on M22×1.5 Voss threads.
Ensure snap-on exhaust fitting is fully seated.
Double-check connections are tight and free of kinks.
Recharge air system until full pressure is reached (~10 bar).
Apply service brake slowly — listen for rapid air flow to rear brakes.
Release brake — confirm quick exhaust sound and full release within seconds.
Check for leaks using soapy water at all joints.
