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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 one (1) psi of control
pressure to the controlled device; however, for special
applications the valve is available with greater differential
pressure designed into the valve.
Reference Figure 1, two styles of Quick Release Valves are
available and are functionally the same; the QR valve, which
is of older design and utilizes a spring and spring seat, and
the QR-1 valve, which in its standard configuration does not
employ a spring or spring seat.
(Note: AR-1 Valves with a pressure differential employ a spring
and spring seat. )
Porting consists of one (1) brake valve port, two (2) delivery
ports and one ( 1 ) exhaust port.
OPERATION
When a brake application is made, air pressure enters the
brake valve 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 port.
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 brake valve
application is released; the air pressure above the diaphragm
is released back through the brake valve exhaust; air pres-
sure beneath the diaphragm forces the diaphragm to rise,
opening the exhaust, allowing air in the chambers to ex-
haust.
PREVENTIVE MAINTENANCE
Every 12 months, 100,000 miles or 3600 operating hours;
disassemble valve, wash metal parts in mineral spirits, wipe
rubber parts dry. It is recommended that all rubber parts be
replaced. Inspect all parts and replace any part showing
signs of wear or deterioration.
OPERATING AND LEAKAGE TESTS
While holding a foot brake valve application:
FIGURE 1
QR AND QR-1 QUICK RELEASE VALVES
*Formerly SD-03-69
QR-1 VALVE
QR VALVE
Brake Valve
Port
Brake Chamber
Port
Brake Chamber
Port
Exhaust Port
Diaphragm
O-Ring
Cover
Spring
Brake Valve
Port
Brake Chamber
Port
Brake Chamber
Port
O-Ring
Cover
Body
QR-1 Valve
Diaphragm
QR Valve
Exhaust Port
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