The Midland Haldex KN28055 is a four-port air brake relay valve featuring anti-compounding protection and dual crack pressure. Port sizes are 1/2-inch supply (port 2), 1/2-inch delivery (port 4), and 1/4-inch control (port 2). Primary crack pressure is set at 4.6 PSI; secondary crack pressure is 9.6 PSI with primary-biased operation. This multi-application valve suits a range of heavy-duty air brake systems. A mounting bracket is not included and must be sourced separately. If you need to confirm the correct fit for your application, call Pro Gear and Transmission and we will help you work through it.
Do not substitute a single crack pressure valve when replacing this unit, replacing with a single crack pressure valve is not recommended.
Repair kit: use part number RN10JZ.
Cross-references include: 401220, 401220TRA, N30111, N30111A, N30111B, N30111C, N30111D, N30111F, RKN28055, MBIKN28055, MIDKN28055, and MDKN28055.
Features
Four-port relay valve with anti-compounding protection
Dual crack pressure: 4.6 PSI primary, 9.6 PSI secondary, primary-biased
1/2-inch supply port (port 2) and 1/2-inch delivery port (port 4)
1/4-inch control port (port 2)
Multi-application design suits a range of heavy-duty air brake systems
Mounting bracket not included
Tech Specs
- Supply (2) 1/2"
- Delivery (4) 1/2"
- Control (2) 1/4"
- Primary Crack Pressure 4.6 PSI
- Secondary Crack Pressure 9.6 PSI
- OEM Part Number Various
- Notes Bracket not included.
Additional Information
Mounting bracket not included; brackets are available separately.Do not substitute a single crack pressure valve when replacing this unit, replacing with a single crack pressure valve is not recommended.
Repair kit: use part number RN10JZ.
Cross-references include: 401220, 401220TRA, N30111, N30111A, N30111B, N30111C, N30111D, N30111F, RKN28055, MBIKN28055, MIDKN28055, and MDKN28055.
