SINOTRUK WABCO WG9000360523 four circuit protection valve

Description

SINOTRUK WABCO WG9000360523 four circuit protection valve introduce:

The WABCO WG9000360523 four circuit protection valve of Sinotruk heavy trucks is usually used in conjunction with the air dryer. WABCO WG9000360523 four circuit protection valve is a key component in the pneumatic braking system, mainly used to distribute compressed air to four separate circuits. This ensures that if one circuit fails (such as air leakage or blockage), the other circuits can still operate normally, thereby ensuring driving safety.

The function of WABCO WG9000360523 four circuit protection valve:

1. Improving braking reliability: The compressed air from the air compressor is divided into four independent circuits, which are respectively supplied to the front axle braking, rear axle and mid-axle braking, parking braking and auxiliary gas systems (such as clutches, air suspensions, etc.). When one circuit fails, the other circuits can still continue to operate, providing sufficient braking force to ensure the vehicle stops safely.
2. Fault protection: Each circuit can be independently adjusted according to actual needs. When there is a leakage in one circuit, the four circuit protection valve will automatically close or limit the pressure loss of that circuit to prevent the entire braking system from failing and ensure that other circuits still maintain a safe pressure. This improves the flexibility and adaptability of the braking system.
3. Pressure regulation: The partial four circuit protection valve also has a pressure reduction function, which can provide different working pressures for different systems (such as air suspension and braking systems). This significantly improves the braking performance and driving safety of the truck, providing a more reliable guarantee for drivers and passengers.

The structure of WABCO WG9000360523 four circuit protection valve:

This WABCO WG9000360523 four circuit protection valve is usually a five-way valve with a diaphragm internal structure. It has one intake port and four outlet ports. The compressed air from the pressure regulating valve enters the four circuit protection valve through the intake port and then passes through the bypass hole and the one-way valve to enter the four circuits of the system.

Intake port (1 port): Connects to the WABCO air dryer or air reservoir.

Four exhaust ports (21, 22, 23, 24 ports):

• 21 port: Front axle braking circuit
• 22 port: Middle and rear axle braking circuit
• 23 port: Parking brake circuit (also emergency brake)
• 24 port: Auxiliary air supply circuit (such as clutch, exhaust braking, etc.).

Internal components:

• Diaphragm: Used to sense changes in air pressure and control valve opening and closing.
• One-way valve: Prevents gas backflow and ensures independent circuits.
• Pressure regulating spring: Sets the opening and closing pressure of the valve.

The working principle of WABCO WG9000360523 four circuit protection valve:

1. Normal inflation: Compressed air enters through the inlet and passes through the bypass hole and the one-way valve to enter the four circuits. When the air pressure reaches the set value (such as 0.65 MPa), the valve opens and the gas enters the gas storage tanks of each circuit.
2. Fault protection: If there is a leak in one circuit (such as the front axle braking circuit at port 21), the compressed air in other circuits will be briefly replenished. However, when the dynamic closing pressure is reached, the valve closes to prevent further loss of air pressure. For example, if the parking brake circuit (port 23) leaks, the four circuit protection valve will prioritize ensuring the air pressure of the driving brake circuits (ports 21 and 22), preventing the vehicle from losing braking force.

WABCO WG9000360523 Four Circuit Protection Valve Common Faults and Maintenance:

One circuit fails to inflate or leaks air: This could be due to moisture in the air passage, prolonged exposure causing extensive corrosion of the inner cavity, blocking the air valve, or the detachment of corrosion debris affecting the diaphragm rupture, resulting in air leakage. It could also be that the opening pressure of each branch of the four circuit protection valve during factory assembly was not properly adjusted, possibly due to damage or deformation of the diaphragm, valve seat, or piston assembly, or improper adjustment after maintenance and replacement of related components.

The pressure gauge shows pressure imbalance: Usually, this is caused by the valve or one-way valve being stuck, or the diaphragm breaking, resulting in air leakage. These problems are mostly caused by excessive moisture in the air passage and severe corrosion of the inner cavity.

Why do heavy trucks need four circuit protection valve?

Safety requirements: According to the braking safety standards, heavy vehicles must adopt at least two independent braking circuits to prevent complete braking failure due to a single point failure.

Enhance reliability: The four-circuit design ensures that even if one braking circuit fails (such as being punctured by stones and damaging the pipeline), the other circuits can still provide sufficient braking force, avoiding major accidents.

Maintenance of WABCO WG9000360523 four circuit protection valve:

• Regular inspection: Regularly inspect the appearance of the four-circuit protection valve to check for any signs of damage, air leakage, etc., and also check if the connecting pipelines are firmly attached.
• Cleaning maintenance: Keep the four-circuit protection valve clean to prevent dust, oil, and other substances from entering the valve and affecting its normal operation. For moisture and rust in the air passages, use a dedicated cleaner for cleaning and ensure the air passages are dry.
• Pressure test: Regularly conduct pressure tests on the four-circuit protection valve to check if its opening pressure and closing pressure are within the specified range. If there are deviations, adjustments or replacement of valve cores, springs, etc. are necessary.

The WABCO WG9000360523 four circuit protection valve is the “safety hub” of the braking system for heavy trucks. Through shunting, isolation, and fault protection mechanisms, it ensures the braking reliability of the vehicle in complex working conditions. Regularly checking the working condition of this valve (such as whether the air pressure is normal and if there is any air leakage) is crucial for driving safety.