
13
Relay Valves
Midland
KN28130X
2 Port Delivery
Used to apply and release service brakes
on tractor or trailer. Can be used to con-
trol application and release of spring
brakes on tractor. Incorporates anti-com-
pounding feature to prevent simultaneous
service and spring brake application.
Midland
KN28300X
FAB (Fast Air & Balancing)
Relay Valve
2 Port Delivery
Used on converter dollies and long wheel base
towing trailers to speed the tractor control sig-
nal to the rear trailer(s) service brakes. Origi-
nal manufacturer claims a 0 psi crack pressure
and 0 psi differential.
Delivery
Supply
Control
Control
Delivery
Control
Supply
Supply
Part No. Supply Ports
Delivery
Ports
Control
Ports
Crack
Pressure
Wght.
Core
Class
Core
Grp.
Minor
Maint. Kit
Comments
KN28130X 1 - 1/2" PT 1 - 3/8" PT 2 - 1/2" PT 2 - 1/4" PT 4.0 ±1 PSI 3 lbs. VG V6 VK1016M
Part No.
Supply
Ports
Delivery
Ports
Control
Ports
Crack
Pressure
Wght.
Core
Class
Core
Grp.
Minor
Maint. Kit
Comments
KN28300X 2 - 1/2" PT 2 - 1/2" PT 1 - 3/8" PT 0 PSI 3 lbs. VF V5 VK1016M
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