BENDIX QR-1C DBL CHECK QUICK RELEASE VALVE Manual

Bendix ® QR-1C ™ Double Check and Quick Release Valve
Mounting Holes
Delivery (2)
FIGURE A
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
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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).
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3. QR-1C valve supply port (1) connected to delivery of
park control valve.
Sealing Ring
Cap Nut
Supply
Port(1)
Delivery
Cover
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
optional noise reducing foam crosses or silencers. Some
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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.
FIGURE B
Double Check
Diaphragm
Balance Port(1)
Quick Release
Diaphragm
Exhaust
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valves also come with
Beaded
(Biased) Seat
Non-Beaded
Identification
Mark
Body
Sealing Ring
1