Technical product record

Double Check Valve

Selects an available pneumatic input while isolating parallel control signals.

TCS part number9001800220

Portfolio familyPneumatic Control

System role

Allow two signal sources to serve a common downstream circuit.

Typical application

Trailer control circuits with alternative signal paths.

Reference specification

Known product data.

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

FunctionPneumatic signal selection

InputsDual

SelectionConfirm flow direction and ports

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 recordDouble Check ValveAllow two signal sources to serve a common downstream circuit.

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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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