QRV 9100 (PDF FORMAT)
2
©
Copyright Eaton Corp. 2006, All Rights reserved.
1.0 INTRODUCTION
Throughout this manual there are a number of
HAZARD WARNINGS
that must be read and
adhered to in order to prevent possible personal
injury and/or damage to equipment. Three sig-
nal words
“DANGER”, “WARNING”
and
“CAUTION”
are used to indicate the severity of
a hazard, and are preceded by the safety alert
symbol
Denotes the most serious hazard, and is
used when serious injury or death WILL
result from misuse or failure to follow spe-
cific instructions.
Used when serious injury or death MAY
result from misuse or failure to follow spe-
cific instructions.
Used when injury or product/equipment
damage may result from misuse or failure to
follow specific instructions.
It is the responsibility and duty of all personnel
involved in the installation, operation and main-
tenance of the equipment on which this device
is used to fully understand the:
procedures by which hazards can be avoided.
1.1
Description
The Airflex
®
QRV is a quick release valve that
facilitates the release of air from a pressurized
chamber i.e., air cylinders, clutches, brakes or
other pneumatic devices. In essence it provides
an exhaust port at the chamber rather than
exhausting through long supply lines and con-
trol components. The function they perform is
especially important in high speed cycling
equipment. They prevent sluggish operation,
overlap and excessive wear. Their importance
in an air control system cannot be overempha-
sized.
QRV’s are available in four sizes for direct con-
nection to 3/8, 1/2, 3/4 and 1 inch pipe. Models
are also available which permit 1/2, 5/8 and 3/4
inch outside diameter tubing connections to the
QRV inlet port.
Exhaust noise from the valve can be reduced
by using a muffler, which threads into the
tapped hole in the end cap.
1.2
How It Works
Figure 2
The Airflex QRV contains a diaphragm
designed to function on a pressure differential.
Air pressure at the valve inlet seats the dia-
phragm on the end cap, closing the exhaust
port. Applied pressure, acting on the outer
unsupported diaphragm area, deflects it and
allows air to flow to the cylinder port. See
Fig-
ure 2
.
When a pressure drop occurs in the air supply,
the pressure differential lifts the diaphragm from
the exhaust port and seats it on the inlet port.
Air from the pressurized device can now flow
freely to atmosphere through the valve’s
exhaust port.
If the cylinder pressure falls below the inlet
pressure, the pressure differential on the dia-
phragm will close the exhaust port, preventing
further exhaust.
