Description

Overview: Sealco trailer relay valve 4 port

The Sealco trailer relay valve 4 port provides rapid, balanced control of service air to heavy trailer brake chambers. It responds quickly to the service brake signal so rear axle brakes apply and release in step with the prime mover. This helps maintain stable, predictable braking on multi-axle combinations.

Features: Sealco trailer relay valve 4 port

• Four 3/8″ NPT delivery ports to serve multi-axle trailer brake layouts efficiently.
• Factory set crack pressure of 4.5 psi to coordinate timing with other relay valves in the system.
• 3/4″ NPT reservoir port and 3/8″ NPT control port for straightforward integration into existing air piping.
• Genuine Sealco design that supports consistent performance on linehaul and local trailer work.

Specifications and Materials

This relay valve uses one 3/4″ NPT reservoir port, one 3/8″ NPT control port and an auxiliary 3/8″ NPT supply port feeding four 3/8″ NPT delivery ports. The valve is preset to a 4.5 psi crack pressure so it begins to open at a predictable control pressure level.

Part number: AB8395G.

Internal construction follows typical heavy-duty service relay valve practice with a spring-loaded internal piston, elastomeric seals and a corrosion-resistant body suitable for trailer air brake service. As a result, it suits harsh road environments where vibration and contamination are common.

Additional technical data appears in the Sealco manufacturer relay valve coding guide

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. 110143, RV045, LOV4, 110451.

Compliance and Safety

This relay valve is intended for use in correctly engineered air brake systems that follow heavy vehicle brake design practices. Therefore installers should follow OEM or engineering drawings for port allocation, mounting orientation and support brackets. After installation, always pressure test the system, check for leaks and verify that application and release timing matches axle and brake manufacturer requirements.

Trailer Applications: Sealco trailer relay valve 4 port

This Sealco trailer relay valve 4 port typically sits close to the trailer service brake chambers to reduce line length and delay. It suits multi-axle trailers where a single control signal must deliver air to four brake chambers or more. In addition, it can be used on converters, dollies and semi-trailers that require consistent service brake response across several axles.

Cross-reference and Suitability

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

Always confirm port sizes, crack pressure and mounting arrangement against the original component before finalising replacement to ensure correct brake timing and performance.

Why Choose ICS Trailers

ICS Trailers focuses on heavy vehicle trailer parts, so product selection favours proven air brake components for Australian conditions. Our team checks specifications, cross-references and typical applications so you can match valves with confidence. For more compatible valves, fittings and accessories, you can Browse Air Brake Parts at ICS Trailers