BENDIX QR-1C DBL CHECK QUICK RELEASE VALVE User Manual

1
FIGURE A
SD-03-904
DESCRIPTION
The Bendix
®
QR-1C
™
is a dual function valve. The valve’s
primary function is to serve the emergency side of a spring
brake actuator as a quick release valve. In addition, it
functions as an anti-compound device. The double check
valve prevents a service and emergency brake application
from occurring simultaneously.
The QR-1C
™
valve is generally mounted on the axle and
serves two spring brake actuators. The air connections to
the QR-1C
™
valve are as follows:
1. QR-1C
™
valve delivery port (2) connected to emergency
port of spring brake.
2. QR-1C
™
valve balance port (1) connected to delivery of
brake valve or relay valve. NOTE: If relay valve is installed
on vehicle, it should be connected to the delivery side
(not service or signal side).
3. QR-1C
™
valve supply port (1) connected to delivery of
park control valve.
In its standard configuration the valve is designed to deliver
within 1 psi of control pressure. However, for special
applications the valve is available with greater differential
pressure or zero hysteresis. QR-1C
™
valves also come with
optional noise reducing foam crosses or silencers. Some
QR-1C
™
valves can also come with biased double check
valves. These double check valves contain a beaded seat
cap nut (Figure B). The bias design minimizes low differential
leakage.
Bendix
®
QR-1C
™
Double Check and Quick Release Valve
Mounting Holes
Delivery (2)
Supply
Port(1)
Body
Quick Release
Diaphragm
Delivery
Sealing Ring
Exhaust
Cover
Sealing Ring
Double Check
Diaphragm
Balance Port(1)
Cap Nut
Beaded
(Biased) Seat
Non-Beaded
Identification
Mark
FIGURE B

BENDIX QR-1C DBL CHECK QUICK RELEASE VALVE Specifications

General

Brand	BENDIX
Model	QR-1C DBL CHECK QUICK RELEASE VALVE
Category	Control Unit
Language	English

Summary

Bendix QR-1CT Double Check and Quick Release Valve Overview

Valve Description and Connections

Explains the dual function of the QR-1CT™ valve, its anti-compound feature, mounting, and air connections.

Biased vs. Non-Biased Seat

Illustrates and describes the difference between beaded (biased) and non-beaded valve seats.

Valve Operation and Functionality

Spring Brakes Released Operation

Details how air flows and diaphragms flex when spring brakes are released.

Spring Brakes Applied Operation

Explains air exhaustion and diaphragm flex when spring brakes are applied.

Anti-Compounding Function

Describes how the valve prevents simultaneous service and spring brake applications.

Maintenance and Service Procedures

Preventive Maintenance Guidelines

Provides guidelines for inspecting the QR-1CT™ valve for proper operation every 12 months or 3600 hours.

Valve Removal Steps

Lists the steps required to remove the QR-1CT™ valve from the vehicle.

Disassembly Procedure

Outlines the procedure for disassembling the QR-1CT™ valve, including parts removal.

Cleaning and Inspection

Details cleaning methods for metal and rubber parts and inspection for wear.

Assembly Instructions

Provides step-by-step instructions for reassembling the QR-1CT™ valve, including torque specs.

Operating and Leakage Tests

Describes tests to verify valve operation and check for air leaks using soap solution.

Installation and Safety Guidelines

Installation Instructions

Specifies how to mount the valve and reconnect air lines.

General Safety Precautions

Lists essential safety instructions to avoid personal injury or death when working on the vehicle.