303.02.0031 4-circuit protection valve
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303.02.0031 4-circuit protection valve — KNORR-BREMSE

303.02.0031

Summary

●Port 1: M22x1,5 ●Port 21: M16x1,5 ●Port 22: M16x1,5 ●Port 23: M16x1,5 ●Port 24: M16x1,5 ●Opening Pressure 21: 7 BAR ●Opening Pressure 22: 7 BAR ●Opening Pressure 23: 6,5 BAR ●Opening Pressure 24: 6,5 BAR ●Closing Pressure 21: 5,4 BAR ●Closing Pressure 22: 5,4 BAR ●Closing Pressure 23: 4,9 BAR ●Closing Pressure 24: 4,9 BAR

EAN Code8699031096285
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Description

The technical function of this component is to manage pneumatic pressure distribution across multiple circuits, ensuring consistent braking performance and system safety. This high-strength component is engineered to maintain stable pressure levels even under rigorous heavy commercial vehicle operations.

303.02.0031 is the OE-equivalent of the KNORR-BREMSE AE 4434 and II16098 4-circuit protection valve used in MAN systems (81.52151-6013, 81.52151-6057, 81.52151-6066, 81.52151-6069). It provides precise regulation for heavy commercial vehicle brake systems through specialized port configurations.

Workshop technicians should ensure that the connection ports (M22x1,5 and M16x1,5) are properly aligned before installation to prevent leaks. Regular inspection of the opening and closing pressures (ranging from 7 BAR to 4,9 BAR depending on the circuit) is recommended to maintain optimal braking responsiveness in the vehicle system.

Technical Specifications

Port 1M22x1,5
Port 21M16x1,5
Port 22M16x1,5
Port 23M16x1,5
Port 24M16x1,5
Opening Pressure 217 BAR
Opening Pressure 227 BAR
Opening Pressure 236,5 BAR
Opening Pressure 246,5 BAR
Closing Pressure 215,4 BAR
Closing Pressure 225,4 BAR
Closing Pressure 234,9 BAR
Closing Pressure 244,9 BAR

Other OEMs

KNORR-BREMSE

  • AE 4434
  • II16098
  • AE4434

MAN

  • 81.52151-6013
  • 81.52151-6057
  • 81.52151-6066
  • 81.52151-6069
  • 81-52151-6013
  • 81-52151-6057
  • 81-52151-6066
  • 81-52151-6069
  • 81521516013
  • 81521516057
  • 81521516066
  • 81521516069

Vehicles Used

BrandModelEngine
KNORR-BREMSE
MAN

FAQ

Which OEM numbers are compatible with this part?
This part is compatible with AE 4434, II16098, 81.52151-6013, 81.52151-6057, 81.52151-6066, and 81.52151-6069.
What are the specific port sizes for installation?
The unit features Port 1 with M22x1,5 and Ports 2 through 24 with M16x1,5 thread dimensions.
Is this part suitable for MAN heavy commercial vehicles?
Yes, it is designed for compatibility with MAN and KNORR-BREMSE pneumatic braking systems.
What is the opening pressure for Port 23 and Port 24?
The opening pressure for both Port 23 and Port 24 is set at 6,5 BAR.
What is the closing pressure for the primary circuits?
The closing pressure for Port 21 and Port 22 is set at a stable level of 5,4 BAR.