Description

Overview

This air brake relay valve two delivery port unit is designed for heavy trailer brake systems that use two tank, three valve layouts and similar tractor applications. It helps deliver faster, more even brake application across multiple axles. By moving air closer to the chambers, it reduces lag time from the foot valve to the spring brake actuators. As a result, it supports consistent control on loaded and unloaded trailers.

Features

• Two delivery port relay valve layout suited to two tank, three valve trailer systems
• Factory installed 1/2″ x 3/8″ nipple on the primary supply port for straightforward plumbing
• 3/8″ NPT delivery ports and 1/4″ NPT control port for common air brake fittings
• Nominal 6 PSI crack pressure to bring brakes on in a predictable, repeatable way

Specifications and Materials

Part number: AB8461P.
The supply side uses an A port configured with a 1/2″ x 3/8″ nipple installed at the factory, while the B supply port is plugged for systems that only require a single live feed. Delivery ports are 3/8″ NPT, which suits most standard trailer brake hose fittings. The control port is 1/4″ NPT, allowing a compact signal line to trigger the valve. Crack pressure is set at approximately 6 PSI so the valve opens only once a stable control signal is present. For more technical background on trailer relay valves, refer to manufacturer relay valve reference from a recognised OEM.

Compatibility and Fitment

This cross-reference listing means this valve is a suitable replacement for the part numbers and applications shown. Some changes in air line plumbing may be required. N30110A, N30110, KN28550, 767653010809, RG-5.

Compliance and Safety

This relay valve is intended for use in air brake circuits that comply with relevant heavy vehicle standards and codes of practice. Installers should always isolate and drain air tanks before removing any existing valve. Additionally, all fittings must be cleaned, correctly sealed and tightened to the recommended torque so leaks are avoided. After installation, perform a full leak down and function test so the system meets workshop or fleet procedures before the trailer returns to service.

Trailer Applications

The valve suits general freight, tanker, tipper and other heavy trailer combinations that use two tank, three valve brake layouts. It can also be used on some tractor applications where a separate relay valve is required near the drive axles. In addition, it is appropriate for maintenance programs that replace older valves as a preventative measure rather than waiting for a failure. Fleet operators should match port sizes, crack pressure and mounting arrangement to the existing valve before final selection.

Cross-reference and Suitability

This part cross-references to or suits the following equivalent part numbers and compatible alternatives:

Use this cross-reference information as a guide and confirm port sizes, mounting and crack pressure against the original component before installation.

Why Choose ICS Trailers

ICS Trailers focuses on supplying dependable air brake components that match real world fleet requirements. Each valve is selected so workshops can service trailers efficiently with commonly used port threads and layouts. Furthermore, our team can assist with identifying suitable replacements when the original part number is unclear. For more air brake components, browse Air Brake Parts at ICS Trailers