303.02.0087 4-circuit protection valve
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303.02.0087 KNORR-BREMSE 4-circuit protection valve

303.02.0087

Summary

●Port 1: M22x1,5 ●Port 21: M16x1,5 ●Port 22: M16x1,5 ●Port 23: M16x1,5 ●Port 24: M16x1,5 ●Opening Pressure 21: 5,5 BAR ●Opening Pressure 22: 5,5 BAR ●Opening Pressure 23: 5,5 BAR ●Opening Pressure 24: 5,5 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

EAN Code8683457009462
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Description

The heavy-duty 4-circuit protection valve is a critical component within the pneumatic brake system of heavy commercial vehicles. This part ensures the distribution and isolation of air pressure across multiple circuits to maintain braking performance during pressure fluctuations or leaks. Built with high-strength components, it provides the necessary reliability required for demanding transport environments.

303.02.0087 is the OE-equivalent of the KNORR-BREMSE AE 4191 4-circuit protection valve used in heavy commercial vehicle brake systems. This component is specifically engineered to meet the precise technical requirements of compatible pneumatic systems, ensuring seamless integration and consistent pressure regulation.

For workshop technicians, this unit features a standardized port configuration including Port 1 (M22x1,5) and four auxiliary ports (M16x1,5). The valve operates with an opening pressure of 5,5 BAR and a closing pressure of 4,5 BAR across all four circuits (Ports 21, 22, 23, and 24). Regular inspection of the port seals and pressure thresholds is recommended during routine maintenance to ensure optimal system safety.

Proper installation requires checking the thread compatibility for the M22x1,5 and M16x1,5 connections to prevent pneumatic leaks. This component is essential for maintaining the integrity of the air supply in complex heavy vehicle brake architectures.

Technical Specifications

Port 1M22x1,5
Port 21M16x1,5
Port 22M16x1,5
Port 23M16x1,5
Port 24M16x1,5
Opening Pressure 215,5 BAR
Opening Pressure 225,5 BAR
Opening Pressure 235,5 BAR
Opening Pressure 245,5 BAR
Closing Pressure 214,5 BAR
Closing Pressure 224,5 BAR
Closing Pressure 234,5 BAR
Closing Pressure 244,5 BAR

Other OEMs

KNORR-BREMSE

  • AE 4191
  • AE4191

Vehicles Used

BrandModelEngine
KNORR-BREMSE

FAQ

What is the opening pressure for this 4-circuit protection valve?
The opening pressure for all four circuits (Ports 21, 22, 23, and 24) is set at a constant 5,5 BAR.
Which OEM codes is this part compatible with?
This product is a direct replacement for the KNORR-BREMSE AE 4191 system.
What are the thread specifications for the ports?
The main port (Port 1) is M22x1,5 and the four auxiliary ports (Ports 21-24) are M16x1,5.
Is this part suitable for heavy commercial vehicles?
Yes, it is specifically designed for heavy commercial vehicle brake systems requiring high-strength components.
What is the closing pressure threshold?
The closing pressure for all four circuits (Ports 21 through 24) is exactly 4,5 BAR.