OEM WG9000360523/1 WABCO Four-Circuit Protection Valve | 934 714 403 0 | M22×1.5 Ports | For Sinotruk HOWO / Shacman / SITRAK
OEM WABCO four-circuit protection valve for heavy-duty air brake systems.
Part Numbers: WG9000360523/1, WG9000360523/2, WG90003605232, AZ87353400100.
WABCO Reference: 934 714 403 0 (direct interchange).
Port Configuration: M22 × 1.5 (Port 1, 21, 22, 23, 24); M16 × 1.5 auxiliary ports.
Opening Pressure: 6.9 bar (Ports 21, 22, 24); 7.0 bar (Port 23).
Max. Operating Pressure: 13.0 bar.
Products Description
The WG9000360523/1 Four-Circuit Protection Valve is a genuine WABCO air brake component engineered for the pneumatic braking systems of Sinotruk HOWO, HOWO A7, T7H, SITRAK, Shacman, and other heavy-duty commercial vehicles. As the central air distribution hub, this valve receives compressed air from the air dryer and safely distributes it to the vehicle's four independent pneumatic circuits: front service brakes, rear service brakes, parking/emergency brakes, and auxiliary circuits.
The valve's primary function is fault isolation and pressure protection. If one air line bursts, disconnects, or develops a severe leak, the internal check valve and spring mechanism automatically seals the affected outlet once pressure drops to approximately 6.4 bar. This preserves air pressure in the remaining three intact circuits, preventing a single-point leak from causing a complete brake failure.
The valve also provides priority pressurization: front and rear service brake circuits are filled first, ensuring the most safety-critical brakes are operational before the parking brake and auxiliary circuits receive air. This valve is a direct replacement for the original factory unit, making it ideal for fleet maintenance and heavy-truck parts distribution
Key Features & Benefits
- Genuine WABCO Quality: Manufactured to exact WABCO specifications. Reference Number: 934 714 403 0. OEM Part Numbers: WG9000360523/1, WG9000360523/2, WG90003605232.
- Four-Circuit Protection: Safely distributes compressed air to front brakes, rear brakes, parking/trailer brakes, and auxiliary systems.
- Automatic Fault Isolation: Seals a leaking circuit at approximately 6.4 bar, preserving pressure in the remaining three circuits.
- Priority Pressurization: Service brake circuits are charged first for maximum safety.
- Precision Port Threads: M22 × 1.5 JED-388 on main ports; M16 × 1.5 auxiliary ports for accessory connections.
- High-Strength Die-Cast Housing: Withstands vibration and pressure cycling in harsh operating environments.
- Direct Bolt-On Replacement: Factory-matched mounting and port positions for straightforward installation.
- 12-Month Warranty: Backed by a comprehensive warranty against manufacturing defects.
Application & Compatibility
| Brand | Models | Note |
|---|---|---|
| Sinotruk (CNHTC) | HOWO, HOWO A7, T7H, T5G, TX | Full compatibility |
| SITRAK | C7H, C5H | Full compatibility |
| Shacman | Delong F3000, X3000 | Full compatibility |
| Others | FOTON, JAC, King Long, Beiben, SUNWIN | Compatible with WABCO 934 714 403 0 applications |
Note: This valve is designed for 1.0 MPa (10 bar) nominal system pressure. Please verify your original part number and port thread specifications before ordering.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | WG9000360523/1 |
| Alternate Part Numbers | WG9000360523/2, WG90003605232, AZ87353400100 |
| WABCO Reference | 934 714 403 0 |
| Product Type | Four-Circuit Protection Valve |
| Port 1 Thread | M22 × 1.5 JED-388 |
| Port 21 Thread | M22 × 1.5 JED-388 |
| Port 22 Thread | M22 × 1.5 JED-388 |
| Port 23 Thread | M22 × 1.5 JED-388 |
| Port 24 Thread | M22 × 1.5 |
| Auxiliary Ports | M16 × 1.5 |
| Opening Pressure 21 | 6.9 bar |
| Opening Pressure 22 | 6.9 bar |
| Opening Pressure 23 | 7.0 bar |
| Opening Pressure 24 | 6.9 bar |
| Dynamic Closing Pressure | 6.4 bar (all circuits) |
| Charging Pressure | 3.5 bar |
| Max. Operating Pressure | 13.0 bar |
| Operating Temperature | -40°C to +90°C |
| Dimensions | 119 × 111.6 × 100 mm |
| Net Weight | 0.765 kg |
| Place of Origin | China |
| Warranty | 12 Months |
Cross Reference Numbers
| Brand / Source | Reference Part Numbers |
|---|---|
| WABCO | 934 714 403 0 |
| Sinotruk (CNHTC) | WG9000360523/1, WG9000360523/2, WG90003605232, AZ87353400100 |
| Shaanxi (Shacman) | 81521516094 |
| FOTON | 1525835685010, 1612135600003, L0356502003A0 |
| JAC | 59480-Y43G6 |
| King Long | 235500350 |
| Beiben | 5204310306 |
| SUNWIN | SWB563050138 |
| C&C Trucks | 100353400016AB0 |
Packaging & Shipping
Customer Feedback
Installation & Maintenance Notes
- Safety First: Park on level ground, stop the engine, and drain all air pressure from the system before beginning work.
- Disconnect Air Lines: Label and disconnect the air lines from ports 1, 21, 22, 23, and 24. Cap the lines to prevent contamination.
- Remove Old Valve: Remove the mounting bolts and extract the old valve from its bracket.
- Inspect Components: Check the air dryer, lines, and fittings for wear or corrosion. Replace any worn components.
- Install New Valve: Position the new valve and secure with mounting bolts. Torque to specification.
- Reconnect Air Lines: Attach lines to the corresponding ports. Tighten all fittings to the specified torque (M22 × 1.5).
- Pressurize and Test: Build air pressure and check all connections for leaks using a soap solution. Verify the system reaches the specified cut-off pressure.
- Functional Test: Confirm the valve isolates a simulated leak in one circuit while maintaining pressure in the others.
- Maintenance: Drain the air reservoir periodically. Replace the air dryer cartridge if water or oil is discharged. Inspect the valve for air leaks at regular intervals.
⚠️ Warning: Air brake systems operate under high pressure. Installation and service should be performed by a qualified mechanic with proper certification and equipment.
Frequently Asked Questions (FAQ)
Q1: What is the part number of this valve?
The primary OEM part number is WG9000360523/1. It is also referenced as WG9000360523/2, WG90003605232, and AZ87353400100. The WABCO reference is 934 714 403 0.
Q2: What is the function of a four-circuit protection valve?
It distributes compressed air from the air dryer to the vehicle's four independent pneumatic circuits and automatically isolates any circuit that develops a leak, preserving brake function in the remaining circuits.
Q3: Which trucks does this valve fit?
It fits Sinotruk HOWO, HOWO A7, T7H, T5G, TX, SITRAK C7H/C5H, Shacman Delong F3000/X3000, and other commercial vehicles with WABCO 934 714 403 0 applications.
Q4: What are the port thread sizes?
Main ports (1, 21, 22, 23, 24) use M22 × 1.5 JED-388 threads. Auxiliary ports use M16 × 1.5 threads.
Q5: What is the opening pressure?
6.9 bar for circuits 21, 22, and 24; 7.0 bar for circuit 23.
Q6: Is this a direct bolt-on replacement?
Yes, it is designed as a direct OEM replacement with factory-matched mounting and port positions.
Q7: What is the warranty period?
We provide a 12-month warranty against manufacturing defects.
Q8: Can you ship to my country?
Yes, we ship worldwide. We offer EXW, FOB, CIF, and CFR terms. Contact us for a personalized shipping quote.
Q9: Do you offer bulk pricing for fleet or distributor orders?
Yes, we offer competitive pricing for bulk orders. Please contact us with your quantity requirements.
Q10: How do I know if this valve fits my truck?
Provide us with your VIN, chassis model, or original part number. Our team will verify compatibility and recommend the correct replacement.
Q11: Can I replace just the internal seals instead of the whole valve?
Yes, WABCO offers a repair kit (9347149222) for internal seals and springs. However, if the valve body is damaged or corroded, replacing the complete assembly is recommended.
Ready to order? Contact us for pricing, bulk discounts, and shipping quotes. We respond to all inquiries within 24 hours.
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