BENDIX QRV QR-1 QUICK RELEASE VALVES User Manual

1
SD-03-901
DESCRIPTION
The function of the quick release valve is to speed up the
exhaust of air from the air chambers. It is mounted close to
the chambers it serves. In its standard configuration the
valve is designed to deliver within 1 psi of control pressure to
the controlled device; however, for special applications the
valve is available with greater differential or zero hysteresis.
QR-1
™
valves also come with optional noise reducing foam
crosses or silencers.
Reference Figure 1, two styles of quick release valves are
available and are functionally the same; the QRV
™
valve,
which is of older design and utilizes a spring and spring
seat, and the QR-1
™
valve, which in its standard configura-
tion does not employ a spring or spring seat.
(Note: QR-1
™
valves with a pressure differential employ a
spring and spring seat.)
Porting consists of one supply port, two delivery ports and
one exhaust port.
OPERATION
When a brake application is made, air pressure enters the
supply port; the diaphragm moves down, sealing the
exhaust. At the same time, air pressure forces the edges of
the diaphragm down and air flows out the delivery ports.
When air pressure being delivered (beneath the diaphragm)
equals the pressure being delivered by the brake valve (above
the diaphragm), the outer edge of the diaphragm will seal
against the body seat. The exhaust port is still sealed by
the center portion of the diaphragm when the supply air is
released; the air pressure above the diaphragm is released
back through the brake valve exhaust; air pressure beneath
the diaphragm forces the diaphragm to rise, opening the
exhaust, allowing delivery air to exhaust.
FIGURE 1
Bendix
®
QRV
™
and QR-1
™
Quick Release Valves
QR-1
™
Quick Release Valve
QRV
™
Quick Release Valve
Supply Port
Delivery Port
Delivery Port
Exhaust Port
O-Ring
Cover
Spring
Supply Port
Delivery
Port
Delivery Port
O-Ring
Cover
Body
QR-1
™
Quick
Release Valve
Diaphragm
QRV
™
Quick
Release Valve
Exhaust Port
Diaphragm

BENDIX QRV QR-1 QUICK RELEASE VALVES Specifications

General

Brand	BENDIX
Model	QRV QR-1 QUICK RELEASE VALVES
Category	Control Unit
Language	English

Summary

Description of Quick Release Valves

Function and Types

Explains the function of quick release valves and introduces QRV and QR-1 valve types.

Operation of Quick Release Valves

Valve Functionality

Details how air pressure controls diaphragm movement for exhaust and sealing.

Preventive Maintenance and Testing

Preventive Maintenance

Guidelines for inspecting QR-1 valves and determining maintenance intervals.

Operating and Leakage Tests

Procedures for testing valve operation and detecting leaks using soap solution.

Safety Guidelines and Procedures

General Safety Guidelines

Critical safety precautions to avoid injury or death when working on vehicles.

Removing and Installing Valves

Steps for safely removing and preparing for installation of quick release valves.

Valve Assembly and Disassembly

Installing Valves

Instructions for mounting valves and connecting air lines.

Disassembly of QRV and QR-1 Valves

Step-by-step instructions for taking apart QRV and QR-1 valves.

Assembly of QRV and QR-1 Valves

Procedures for reassembling QRV and QR-1 valves, including torque specs.

Cleaning and Inspection

Guidance on cleaning valve parts and inspecting for wear or deterioration.