Technical product record

Relay Emergency Valve

Service-brake relay and emergency response when trailer supply is interrupted.

TCS part number9001302930

Portfolio familyPneumatic Control

System role

Transmit brake demand rapidly and manage supply-line failure response.

Typical application

Conventional air-brake trailer circuits.

Reference specification

Known product data.

Values shown are portfolio references for enquiry preparation. Confirm the released specification, variant and interfaces before ordering.

MediumCompressed air

FunctionService relay and emergency control

PortsConfirm circuit and thread arrangement

System context

Where this product sits in the control chain.

Route, relay, limit, isolate or exhaust compressed air so the intended trailer function occurs with the required response.

Upstream inputs

Supply reservoir pressure, service or parking control signal and circuit protection devices.

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Selected recordRelay Emergency ValveTransmit brake demand rapidly and manage supply-line failure response.

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Downstream effect

Controlled delivery pressure to chambers, auxiliary valves or protected pneumatic branches.

Application decision record

What must be confirmed.

The review separates selection, installation and field evidence so responsibility and open points remain clear.

Selection inputs

Exact valve function and behaviour during supply loss
Port numbering, thread family, size and flow direction
Operating-pressure range and any fixed or adjustable setting
Mounting orientation, exhaust path and response requirement

Installation review

Match every circuit line to the marked port—not physical position alone
Prevent sealant, swarf, moisture and line contamination
Keep exhaust openings clear and protected from direct spray
Leak-test the complete circuit in every operating state

Service evidence

Supply, control and delivery pressure readings
Leak location and operating state when leakage occurs
Application and release timing observation
Port map, installed orientation and current part label

Verification focus

Four checks that deserve an explicit record.

01Port logic

02Leakage

03Crack or limiting pressure

04Emergency response

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