Quick Release Valve Tech Specs0 pages

Quick Release Valve Description
Description
The Airflex quick release valve (QRV) is a pneumatic in-line, three-way valve designed to automatically close upon pressurization and open to
exhaust when a pressure drop occurs in the
supply line. The valve provides an exhaust port
close to the pressurized chamber of the device
being controlled rather than exhausting through
long supply lines and/or control components.
The end result is a reduction in lag time between
the signal to exhaust and response. The benefits
derived include:
•
Faster cyclic rates
•
Reduction or elimination of overlap
•
Reduced wear of drive components
Four basic valve sizes are available, identified by
the American National Pipe Thread on the cylinder port: 3/8, 1/2, 3/4 and 1. Models are available with inlet ports suitable for either pipe or
tubing connections. Mufflers are also available
to reduce exhaust noise.
Quick release valve sizes 3/8, 1/2 and 3/4 utilizes a diaphragm in their design. Air pressure,
at the inlet, seats the diaphragm on the end cap,
closing the exhaust port. Pressure on the outer
unsupported diaphragm area causes it to deflect, allowing air to flow to the cylinder port.
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 exhaust port.
The 1 quick release valve utilizes a
plunger in its design. The spring-biased
plunger is guided during its travel by the
fit between its stem and the house. When
sufficient pressure is developed on the
stem’s diametrical area to overcome the
spring force, the plunger shifts, seats on
the seal washer closing the exhaust port.
The unbalance in the exposed plunger
pressurized area favors the inlet side;
thereby, keeping the exhaust port closed.
Air flows through the radial holes in the stem to
the cylinder port.
When a sufficient pressure drop occurs on the
inlet side of the plunger, the spring force shifts
the plunger, opening the exhaust port and blocking the inlet port. Air is now free to flow from
the cylinder to exhaust. Blockage of the inlet
forces the air in the supply line to exhaust back
through the control valve.
Inlet
Exhaust
Cylinder
Plunger
Spring
Seal Washer
Inlet
Exhaust
End Cap
Diaphragm
Valve Pressurized
Cylinder
Valve Open to Exhaust
Inlet
Exhaust
Inlet Side
Exhaust Side
Cylinder
Valve Pressurized
J - 19
Cylinder
Valve Open to Exhaust
Plunger Pressure Unbalance for Closed Valve
Copyright Eaton Corporation, 1997, All rights reserved.