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Shacman Truck Parts Four Circuit Protection Valve DZ96189360005

The DZ96189360005 Four-Circuit Protection Valve is a vital safety component in the air brake system of modern SHACMAN and other Chinese heavy-duty trucks. It ensures that a failure in one brake circuit — such as a burst hose or tank leak — does not compromise the entire braking capability of the vehicle.
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  • DZ96189360005

  • Shacman

Attribute Specification
OEM Number DZ96189360005
Alternative Names Quad Circuit Valve, Air Divider Valve, Brake System Isolation Valve
Number of Circuits 4 Independent Outputs:
- Front Brake Circuit
- Rear Brake Circuit
- Parking Brake Circuit
- Auxiliary/Service Circuit (e.g., suspension, clutch assist)
Valve Type Mechanical check-valve design with internal pistons and springs
Operating Pressure Range 0.6 MPa to 1.0 MPa (6–10 bar / 87–145 psi)
Inlet Port 1 x G1/2" or 16mm air inlet (from air compressor via dryer)
Outlet Ports 4 x G1/2" or 16mm threaded ports (ISO 1502 standard)
Material High-strength alloy steel or cast aluminum body; corrosion-resistant internal components
Seals Nitrile rubber (NBR) or Viton® O-rings for long-term sealing performance
Connection Type Threaded pipe connections (typically brass or steel fittings with PTFE tape required)
Operating Temperature -40°C to +90°C
Compliance Standards GB12676, ECE R27, ISO 15365, WABCO-style functionality
Warranty Typically 6 to 12 months (varies by supplier)
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Usage & Installation Notes

  1. Verify Compatibility Before Purchase
    Confirm:

    • Exact truck model and year

    • Presence of quad-circuit air system

    • VIN and existing valve label photo if possible

  2. Professional Installation Required

    • The air brake system is a safety-critical system.

    • Must be installed and tested by certified technicians familiar with pneumatic systems.

  3. Fully Depressurize System Before Work

    • Release all compressed air from the system by opening drain valves on air tanks.

    • Never disconnect lines under pressure — risk of injury or damage.

  4. Disconnect Battery (Optional but Recommended)

    • Prevents accidental activation of solenoids or ABS modules during work.

  5. Inspect All Air Lines and Fittings

    • Replace cracked, swollen, or aged hoses.

    • Clean metal debris or sludge from old lines before connecting new valve.

  6. Use Proper Thread Sealant

    • Apply PTFE thread tape or anaerobic pipe sealant on threaded connections.

    • Avoid over-tightening — can crack housing or strip threads.

  7. Check Directional Flow (If Marked)

    • Some valves have arrows indicating correct airflow direction.

    • Install accordingly to ensure proper operation.

  8. Test for Leaks After Installation

    • Recharge the air system and bring to full pressure (~8–10 bar).

    • Use soapy water to inspect all connection points for bubbles (indicating leaks).

  9. Perform Functional Brake Test

    • Simulate failure of one circuit (e.g., slightly loosen one outlet) — observe that other circuits retain pressure.

    • Test foot brake, parking brake, and auxiliary functions.

  10. Include in Routine Brake Inspections

  • Check every 10,000 km or during PM service.

  • Listen for hissing sounds (early sign of internal leakage).

  1. Replace Entire Unit If Internally Damaged

  • This valve is non-serviceable — do not attempt to disassemble.

  • Internal spring or piston failure requires full replacement.


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