303.02.0052 4-circuit protection valve
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303.02.0052 KNORR-BREMSE 4-circuit protection valve

303.02.0052

Summary

●Port 1: M22x1,5 ●Port 21: M16x1,5 ●Port 22: M16x1,5 ●Port 23: M16x1,5 ●Port 24: M16x1,5 ●Operating Pressure: 12 BAR ●Opening Pressure 21: 6,5 BAR ●Opening Pressure 22: 6,5 BAR ●Opening Pressure 23: 6,5 BAR ●Opening Pressure 24: 6,5 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 Code8683457005310
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Description

The brake system requires precise pressure management to ensure safety and reliability in heavy commercial vehicles. This high-strength component functions as a critical control element within the pneumatic circuit, managing air distribution across multiple channels to maintain consistent braking performance.

303.02.0052 is the OE-equivalent of the KNORR-BREMSE AE 4648 and K019911 4-circuit protection valve used in KNORR-BREMSE systems. This part is engineered to meet strict technical requirements for heavy-duty operation and provides seamless integration with existing pneumatic hardware.

Designed for professional workshop technicians, this part features specific port configurations including Port 1 (M22x1,5) and four M16x1,5 ports (Ports 21 through 24). It operates at a maximum pressure of up to 20 BAR with an operating pressure of 12 BAR. Maintenance professionals should ensure all connections are secure and check the opening/closing pressure thresholds (6,5 BAR and 4,5 BAR respectively) during routine system inspections to guarantee optimal pneumatic stability.

Technical Specifications

Port 1M22x1,5
Port 21M16x1,5
Port 22M16x1,5
Port 23M16x1,5
Port 24M16x1,5
Operating Pressure12 BAR
Opening Pressure 216,5 BAR
Opening Pressure 226,5 BAR
Opening Pressure 236,5 BAR
Opening Pressure 246,5 BAR
Closing Pressure 214,5 BAR
Closing Pressure 224,5 BAR
Closing Pressure 234,5 BAR
Closing Pressure 244,5 BAR
PressureMAX 20 BAR

Other OEMs

KNORR-BREMSE

  • AE 4648
  • K019911
  • AE4648

Related Products

Repair Kits

Vehicles Used

BrandModelEngine
KNORR-BREMSE

FAQ

Which OEM codes is this part compatible with?
This product is an exact technical equivalent for KNORR-BREMSE codes AE 4648 and K019911.
What are the port sizes for this protection valve?
The unit features one Port 1 (M22x1,5) and four secondary ports (Ports 21, 22, 23, and 24) all sized at M16x1,5.
What is the operating pressure range for this component?
The device operates at a standard pressure of 12 BAR and can handle a maximum pressure of up to 20 BAR.
What are the specific opening and closing pressure thresholds?
The opening pressure for ports 21 through 24 is set at 6,5 BAR, while the closing pressure is set at 4,5 BAR.
Is this part suitable for heavy commercial vehicle brake systems?
Yes, it is specifically designed for heavy commercial vehicle pneumatic brake systems compatible with KNORR-BREMSE hardware.