303.02.0091 4-circuit protection valve — KNORR-BREMSE
303.02.0091
The 303.02.0091 is a precision-engineered 4-circuit protection valve designed for heavy commercial vehicle brake systems. Featuring Port 1 (M22x1,5) and four M16x1,5 ports, it ensures optimal pressure regulation. This part is a high-strength component compatible with KNORR-BREMSE systems, providing reliable pneumatic circuit protection.
| EAN Code | 8683457009509 |
|---|
Description
The heavy duty 4-circuit protection valve plays a critical role in managing pneumatic pressure across multiple braking circuits, ensuring safety and system stability in heavy commercial vehicles. This component is engineered to regulate pressure accurately, preventing total system failure in the event of a circuit leak.
This product is the OE equivalent of the KNORR-BREMSE AE 4411 4-circuit protection valve used in specialized braking systems. It features a specific configuration including Port 1 (M22x1,5), Port 21 (M16x1,5), Port 22 (M16x1,5), Port 23 (M16x1,5), and Port 24 (M16x1,5). The opening pressures are calibrated at 6,7 BAR for ports 21 and 22, 5,8 BAR for port 23, and 5,1 BAR for port 24, with a consistent closing pressure of 4,5 BAR across all ports.
Workshop technicians should ensure all connections are tightened to the specified M-thread standards to prevent pneumatic leaks. Regular maintenance checks of the pressure regulation thresholds are recommended to maintain optimal braking performance and system integrity during heavy-duty operations.
Technical Specifications
| Port 1 | M22x1,5 |
|---|---|
| Port 21 | M16x1,5 |
| Port 22 | M16x1,5 |
| Port 23 | M16x1,5 |
| Port 24 | M16x1,5 |
| Opening Pressure 21 | 6,7 BAR |
| Opening Pressure 22 | 6,7 BAR |
| Opening Pressure 23 | 5,8 BAR |
| Opening Pressure 24 | 5,1 BAR |
| Closing Pressure 21 | 4,5 BAR |
| Closing Pressure 22 | 4,5 BAR |
| Closing Pressure 23 | 4,5 BAR |
| Closing Pressure 24 | 4,5 BAR |
Other OEMs
Vehicles Used
| Brand | Model | Engine |
|---|---|---|
| KNORR-BREMSE |