Norgren 4000 Series User Manual

Quick exhaust valve (fastbrake, 4000 series, Performance

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Performance

Application

The Fastbrake valve was designed to be mounted at the tractor’s glad-hand on heavy-duty truck air

brake systems, in either the service or supply line.

Function

Provides a quick exhaust of the trailer brake pressure when pedal pressure is relaxed, thereby

accelerating and coordinating trailer brakes with tractor brakes.

Forward Flow

AT 70°F, the valve shall flow at least 9.0 SCFM with 2.0 PSIG applied to the trailer end of the valve with

trailer end open to atmosphere.

Exhaust Flow

With 8.8 SCFM air flow applied to the trailer end, and the tractor end of the valve open to the atmosphere,

the pressure at the trailer end shall be 2.0 PSIG max.

Leakage

At 5 and 125 PSIG air, the valve shall not leak more than 50 cc’s per minute from the exhaust port and roll

joint when tested by submersion in liquid.

By-pass Flow

With tractor end of valve at a constant pressure of 10 PSIG, the flow through the valve from the trailer

side shall be 1.0 SCFM or more, with pressure differentials of 0.2 PSIG and 1.0 PSIG measured across

the valve. The valve may actuate prior to obtaining 1.0 PSIG across the valve (flow requirement may not

be achieved in this condition); this is acceptable performance.

Minimum Pressure for Actuation

With the trailer side of the valve attached to a 50 cubic inch volume, and the tractor side connected to a

standard treadle valve by means of a standard coiled air brake hose with no other restrictions, the valve

shall actuate (exhaust air to atmosphere) when treadle is released to its spring return position from an

equilibrium pressure in the above system of 10 PSIG or greater.

Part Number

4000-1, Trailer side, nipple/male thread

4000-8D, Tractor side, nipple/male thread

Features

The Norgren GT Development 4000 Series
Fastbrake quick exhaust valve enables vehicle
OEM’s to comply with brake timing regulations,
enhances vehicle performance, and reduces
installation time. The valves are made from
durable zinc alloy die-castings, which provide
excellent flow characteristics and ensure long life
in the harsh back-of-cab environment.
The Fastbrake will speed up release of the
trailer’s service brakes (if installed in the service
side glad hand) or speed up application of the
trailer’s parking brakes (if installed in the supply
side glad hand).

Our policy is one of continued research and development. We therefore reserve the right to amend,

without notice, the specifications given in this document.

© Norgren GT Development Corporaton, 2014

Quick Exhaust Valve (Fastbrake

®

)

4000 Series

Rev. 8/14

01

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