Manual

6 © 2009, ROSS CONTROLS
®
. All Rights Reserved.
Installation and Troubleshooting
INSTALLATION
• Locate the check valve as close to the cylinder as possible.
This will minimize cylinder bounce and drift.
• Use non-expandable hose between check valve and cylinder.
The expandability of thin-wall flexible hose can magnify cylinder
bounce and drift.
• To install threaded pipe or fittings, engage threads one turn,
apply thread sealant (tape not recommended) to threads, and
tighten pipe or fitting fully.
• After system is pressurized, check all connections with soapy
water to ensure that there are no leaks. Drifting can occur if
leaks are present between the check valve and the cylinder.
• Pressure at port P must be equal to or greater than the pressure
in the cylinder and greater than the minimum operating pressure
of the control valve.
• Do not restrict the exhaust of the control valve.
• In a circuit using a solenoid pilot check valve, the check valve
solenoid and a control valve solenoid must be energized
simultaneously.
TROUBLESHOOTING TIP
The most common cause of unsatisfactory performance is leaky
connections. Always check for leaks with before undertaking any
other repair procedures.
TYPICAL APPLICATIONS: Control of rodless cylinders, double-rod cylinders, air motors
on transfer systems, and part loaders.
CIRCUIT FEATURES:
• When the air supply is turned on, the EEZ-ON
®
valve (see below) slowly pressurizes
the cylinder to provide soft start recharging.
• Allows cylinder to be jogged in either direction.
• L-O-X
®
valve (see below) provides lockable shutoff of supply air, and exhausting of
trapped downstream air.
• Prevents runaways due to loss of air pressure.
Circuit for Control of Rodless Actuators
3-Position,
Pressure Center
Control V alve
Rodless
Cylinder
L-O-X
®
Valve
Flow
Control
Valves
Flow
Control
Valve
EEZ-ON
®
Valve
Other ROSS Valves Used in the Circuits
EEZ-ON
®
Valves
An EEZ-ON
®
valve allows a gradual
buildup of downstream air pressure after
the supply is turned on. Rate of buildup
is adjustable. This controlled action lets
cylinders move slowly and more safely
into normal working positions.
A 3/2 EEZ-ON
®
valve
which has a shutoff-and-
exhaust feature is also
available.
Flow Control Valves
A ROSS flow control valve provides a high
air flow rate into a cylinder, and a precisely
controlled flow rate out of the cylinder. The
adjustable flow can range from near zero
to full flow. A non-rising adjustment knob
turns clockwise to reduce controlled flow.
Flow control valves in
other configurations
are also available
from ROSS.
L-O-X
®
Valves
A ROSS L-O-X
®
valve is an energy isolation valve,
generally the first valve in the air supply line. Air
can be shut off with a push of the red handle, and
downstream air is exhausted at the same time. For
safety, the handle should be padlocked in the closed
position when system maintenance
is being performed.
The manually controlled
L-O-X
®
valve is shown here,
but piloted models to control
the flow of air remotely are
also available.
Port Flow Control Avg. C
v
Size Model Numbers (Fully open)
1/4 1968E2007 2.3
3/8 1968E3007 2.6
1/2 1968E4007 7.5
3/4 1968E5007 8.3
1 1968E6007 17
1¼ 1968E7007 22
Port 2/2 Model Avg.
Size Number C
v
1/4 2781A2007 2.3
3/8 2781A3007 3.8
1/2 2781A4017 4.0
1/2 2781A4007 7.7
3/4 2781A5007 9.0
1 2781A6017 9.0
1 2781A6007 24
1¼ 2781A7007 29
1½ 2781A8017 29
ROSS
®
Port Sizes L-O-X
®
Valve Avg. C
v
In-Out Exh. Model Numbers In-Out Out-Exh
1/4 1/4 Y1523C2002 1.9 1.9
3/8 3/8 Y1523C3012 2.5 2.6
3/8 3/4 Y1523C3002 6.0 8.0
1/2 3/4 Y1523C4002 7.1 8.3
3/4 3/4 Y1523C5012 8.6 9.5
3/4 1¼ Y1523C5002 13 12
1 1¼ Y1523C6002 13 14
1¼ 1¼ Y1523C7012 20 14
1½ 2 Y1523C8002 38 47
2 2 Y1523C9012 38 47