The Midland Haldex KN28510 is an RG2 fast-acting relay valve designed to apply and release service brakes on tractor or trailer air brake systems. The control port is 1/4" NPT, positioned at 90 degrees, and the valve delivers through two 3/8" delivery ports (C and D). Supply A is 3/8" and Supply B is 1/2"; plugs for both sizes are included. Cracking pressure is 5.6 plus or minus 1.0 PSI. The valve mounts via two holes, each 0.34" diameter on 1.50" centers, and measures 3-1/2" wide by 3-1/2" long by 3-5/8" tall. The cover can be rotated without affecting performance. OEM part number N30108BK. A genuine Midland Haldex part, sold by Pro Gear and Transmission. Call us to confirm fit for your specific application.
Cross-reference part numbers include: KN28510, KN28500, KN28520, N30108BK, N30108AC, N30108BD, N30108BG, N30108BJ, N30108BL, N30108BM, N30108BP, 279180, 28510, 110197, 110228, 110275, 110410, 110412, 110416, 9125, 9125X, AE78889, AE86319, A78889, RB28510, and others. Contact Pro Gear and Transmission to verify the correct part for your application.
Features
RG2 fast-acting relay valve - applies and releases service brakes on tractor or trailer
Control port: 1/4" NPT at 90-degree position (0-degree locates port in line with delivery port D)
Two delivery ports (C and D), each 3/8"; Supply A 3/8", Supply B 1/2"
Cracking pressure: 5.6 plus or minus 1.0 PSI
Mounting: two holes, 0.34" diameter on 1.50" centers
Includes plugs: one 1/2" and one 3/8"; cover is rotatable without affecting performance
Tech Specs
- Supply A 3/8"
- Supply B 1/2"
- Delivery C 3/8"
- Delivery D 3/8"
- Control Position 90 degrees
- Control Port 1/4" NPT
- Cracking Pressure 5.6 +/- 1.0 PSI
- Plugs Included 1 @ 1/2", 1 @ 3/8"
- OEM Part Number N30108BK
- Core Group 225
- Width 3-1/2"
- Length 3-1/2"
- Height 3-5/8"
- Mounting Holes (2) 0.34" diameter on 1.50" centers
Additional Information
Repair kit: use part number RN10HM.Cross-reference part numbers include: KN28510, KN28500, KN28520, N30108BK, N30108AC, N30108BD, N30108BG, N30108BJ, N30108BL, N30108BM, N30108BP, 279180, 28510, 110197, 110228, 110275, 110410, 110412, 110416, 9125, 9125X, AE78889, AE86319, A78889, RB28510, and others. Contact Pro Gear and Transmission to verify the correct part for your application.
