Description

Overview

The Sealco Emergency Trailer Relay Valve delivers fast, consistent control of trailer air brakes in demanding road freight service. It suits Australian operating conditions and daily linehaul. As a result, fleets gain reliable braking across multi-axle trailers and dollies.

Features

• Four delivery ports enable flexible plumbing on tandem or tri-axle trailers
• 3/8 NPT delivery and control ports, plus a 3/4 NPT reservoir port
• Nominal crack pressure of 4.5 psi supports responsive brake application
• Robust construction suits heavy vehicles and FMVSS 121-type systems

Specifications and Materials

Part number: AB8301.

For technical background on charging-style relay emergency valves, see the Sealco technical guide.

Compatibility and Fitment

This valve suits heavy trailer air brake systems using 3/8 NPT service plumbing and a 3/4 NPT reservoir connection. For best response, install it in a protected location close to the service chambers.

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.
229434, 277446, 110200, RE045, REO45, ESL110205, 11675, 12350, A99036, AF71890, KN30000, KN30010, KN30400, N3714J, 55110205, 39540285, 110402

Compliance and Safety

Use approved fittings and torque values, then pressure-test the system to confirm no leaks. After installation, perform a full brake function test and confirm the trailer meets ADR and FMVSS-style performance checks.

Trailer Applications

This valve works well on general freight semi-trailers, B-double sets, dollies, and tipper combinations that require a dependable service and emergency relay function with four delivery ports.

Cross-reference and Suitability

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

Why Choose ICS Trailers

We supply proven brands and provide practical technical support to minimise downtime. Additionally, our parts align with common Australian trailer brake layouts and our team backs you with responsive customer service. Browse Air Brake Parts at ICS Trailers