303.02.0040 Compatible 4-Circuit Protection Valve
303.02.0040
Summary
This high-strength 4-circuit protection valve features M22x1.5 and M16x1.5 port configurations. Designed for heavy commercial vehicle brake systems, it manages pressure across four distinct circuits to ensure optimal pneumatic distribution. Compatible with Knorr-Bremse systems. Equivalent to OE Knorr-Bremse AE4603.
| EAN Code | 8683457005198 |
|---|
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Compatible OEM Codes
-
KNORR-BREMSE
- II36011N00
- II3601105T
- II36011004
- II36011
- AE 4603
Description
What does a 4-circuit protection valve do?
This 4-circuit protection valve plays a critical role in the pneumatic braking system of heavy commercial vehicles by isolating air circuits to prevent total brake system failure. By managing pressure distribution, it ensures that a leak in one circuit does not compromise the entire braking capability of the vehicle.Technical specifications and compatibility
The component is designed for high-pressure stability, featuring an operating pressure of up to 13 BAR and a maximum pressure capacity of 20 BAR. It is compatible with Knorr-Bremse systems and is engineered to withstand the demanding conditions found in heavy commercial vehicle braking networks.Installation and maintenance guidance
For technicians, this valve utilizes specific port sizing, including one M22x1.5 inlet and multiple M16x1.5 outlets (Ports 21, 22, 23, and 24). Maintenance should focus on checking the opening and closing pressures—specifically the 6.3 BAR and 5.8 BAR opening thresholds—to ensure the pneumatic circuit responds correctly to system demands.System performance monitoring
Regular inspection of the valve ports and pressure regulation accuracy is essential for fleet safety. Consult your authorized distributor for more information regarding fitment and installation requirements.OE cross-reference
303.02.0040 (4-circuit protection valve) is the equivalent of the Knorr-Bremse OE numbers. This part directly replaces Knorr-Bremse OE numbers AE4603, II36011, II36011004, II3601105T, II36011N00.Technical Specifications
| Port 1 | M22x1,5 |
|---|---|
| Port 21 | M16x1,5 |
| Port 22 | M16x1,5 |
| Port 23 | M16x1,5 |
| Port 24 | M16x1,5 |
| Operating Pressure | 13 BAR |
| Opening Pressure 21 | 6,3 BAR |
| Opening Pressure 22 | 6,3 BAR |
| Opening Pressure 23 | 5,8 BAR |
| Opening Pressure 24 | 5,8 BAR |
| Closing Pressure 21 | 4,8 BAR |
| Closing Pressure 22 | 4,8 BAR |
| Closing Pressure 23 | 4,8 BAR |
| Closing Pressure 24 | 3,8 BAR |
| Pressure | MAX 20 BAR |
Other OEMs
KNORR-BREMSE
- AE4603
- II36011N00
- II3601105T
- II36011004
- II36011
- AE 4603
Related Products
Repair Kits
Compatible Vehicles
| Brand | Model | Model Type | Engine |
|---|---|---|---|
| KNORR-BREMSE |
FAQ
What is the function of a 4-circuit protection valve?
It isolates different pneumatic circuits within the brake system, ensuring that a loss of pressure in one circuit does not lead to a complete failure of the entire braking system.
What are the technical port specifications for this valve?
The unit features an M22x1.5 port as the primary connection, with secondary outlets (Ports 21, 22, 23, and 24) sized at M16x1.5.
What is the maximum operating pressure?
This component is designed for an operating pressure of up to 13 BAR, with a maximum pressure threshold of 20 BAR.
How can I identify if the valve needs replacement?
Technicians should monitor for irregular opening or closing pressures, such as deviations from the standard 6.3 BAR or 5.8 BAR opening thresholds during testing.
What are the OE reference numbers of this part?
303.02.0040 directly replaces Knorr-Bremse OE numbers AE4603, II36011, II36011004, II3601105T, II36011N00.