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With immediate effect please select the 'replaced by' part number when entering an order for the following part numbers:
K019309B90 replaced by K019309V06N50, K019319B90 replaced by K019319V06N50, K055369B90 replaced by K055369V05N50, K055379B90 replaced by K055379V05N50, K110619B90 replaced by K110619V04N50

Knorr-Bremse will close for the Christmas holiday at midday on Friday 23rd December 2022.
Any VOR orders taken on this day will be delivered on Wednesday 28th December 2022.
Knorr-Bremse will provide VOR shipping and Technical Telephone Service during the Christmas period: Wednesday 28th December – 09:00-15:30 & Thursday 29th December – 09:00-15:30
All services resume on Tuesday 3rd January, with sales & technical lines open as usual 08:00-17:30
You cannot place an order at this time, pleaseContact Us for further assistance
  • AE4805
  • Four Circuit Prot. Valve
  • Non saleable to the IAM

999999 In Stock


Weights & Dimensions

Gross Weight
1.8 Kilogram
Net Weight
1.8 Kilogram
172.4 Millimeter
150.0 Millimeter
190.0 Millimeter
Air Inlet port(s) size
No thread - D14.17 
Air Delivery port(s) size
21,22,23,24,25,26: N10164 NG12 - M22x1,5; 27,28: M12x1,5; IP,IPM 
Circuit 1
Feedback with Bypass 
Circuit 1 - Open/close pressure [bar]
Circuit 1 - Pressure Limiting [bar]
Not included 
Circuit 2
Feedback with Bypass 
Circuit 2 - Open/close pressure [bar]
Circuit 2 - Pressure Limiting [bar]
Not included 
Circuit 3
Feedback with no Bypass 
Circuit 3 - Open/close pressure [bar]
Circuit 3 - Pressure Limiting [bar]
8,5 +0,0/-0,4 
Circuit 4
Feedback with no Bypass 
Circuit 4 - Open/close pressure [bar]
7.5 -0.3 
Circuit 4 - Pressure Limiting [bar]
8,5 +0,0/-0,4 
Bleed-back safety feature
Controlled by Circuit 1 
Circuits' supply
Internal series supply from Circuits 1 and 2 to 3 and 4 
With Electrical pressure sensing
Spares/Service Kits