Specific Product Precautions - SMC Networks ASR Series Manual

Warning
1. The product cannot be used as a stop valve, of
which zero leakage is required.
The specifications of the product allow a certain degree of
leakage.
2. Confirm whether PTFE can be used.
The sealing compound contains PTFE (tetrafluoroethylene resin)
powder. Make sure that it will not cause any problem in operation.
3. Keep the set pressure range of the outlet pressure
of the pressure valve within 85% that of the inlet
pressure.
If the value exceeds 85%, the pressure may become unstable,
affected by the fluctuation of the inlet pressure.
Warning
1. Confirm that the lock nut is not loose.
If the lock nut is loose, there may be dangerous changes in
actuator speed.
2. The number of opening and closing rotations of the
needle valve and adjustment screw should be
adjusted within the range of the specifications.
Since it has a pull-out stop mechanism, it will not rotate past the
limit. Confirm the number of rotations for the product being used,
as excessive turning of the needle will cause damage.
3. To adjust the speed, start with the needle in the
completely closed position, and then adjust by
opening gradually.
When the needle valve is opening, the actuator may jerk suddenly
creating a dangerous situation.
Moreover, the needle valve is closed by turning clockwise, and
opened by turning counterclockwise. Therefore, the actuator
speed is reduced by turning clockwise and increased by turning
counterclockwise.
When the product is used for an actuator operating vertically, the
actuator may lurch depending on the load. For the adjustment
method, please refer to "Selection and Adjustment" on page 3
and 4.
4. For installation and removal, tighten the body B by
applying an appropriate wrench to the two opposite
sides of the hexagon.
Using other parts may destroy the valve. For alignment after
installation, rotate body A manually.
5. Do not use universal type fittings at a position
where they are constantly rotated.
The fittings may be damaged.
6. The valve cannot be used if there are fluctuations of
the load.
The piston rod may jerk during operation.
7. In case a closed-center solenoid valve is used,
switch to the center position only after pressure
charge inside the cylinder at the stroke end is com-
pleted.
If the pressure charge is insufficient, the piston rod may jerk after
restart.
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Series
Pressure Valve

Specific Product Precautions

Be sure to read before handling.
Selection
Installation
ASR
/
Flow Valve
Caution
1. The proper tightening torque for pipe fittings is as
shown in the table. As a rule, they should be tightened
2 to 3 turns with a tool after first tightening by hand.
Be careful not to cause damage by over-tightening.
Male Proper tightening torque
thread
1/4 12 to 14
3/8 22 to 24
1/2 28 to 30
Handling of One-Touch Fittings
Caution
1. nstallation and Removal of Tubing for One-Touch
Fittings
1) Installation of tubing
(1) Using tube cutters TK-1, 2 or 3, take a tube having no flaws on
its periphery and cut it off at a right angle. Do not use pinchers,
nippers or scissors, etc. The tubing might be cut diagonally or
flattened, making installation impossible or causing problems
such as disconnection and leakage. Allow extra length for the
tubing.
(2) Hold the tubing and push it in slowly, inserting it securely all the
way into the fitting.
(3) After inserting the tubing, pull on it lightly to confirm that it will
not come out. If it is not installed securely all the way into the
fitting, problems such as leakage or disconnection of the tubing
can occur.
2) Removal of tubing
(1) Push in the release button sufficiently, pressing the collar
evenly around its circumference.
(2) Pull out the tubing while holding down the release button so
that it does not pop out. If the release button is not pressed
down sufficiently, there will be increased bite on the tubing and
it will become more difficult to pull it out.
(3) When the removed tubing is to be used again, first cut off the
section of the tubing which has been chewed. Using the
chewed portion of the tube as it is can cause problems such as
leakage or difficulty in removing the tubing.
Caution
1. The valve cannot be used if the same pressure is required for
both the working and return strokes.
The pressure valve and flow valve are designed to save air by
the difference in the operating pressure.
2. Install a flow valve on the working side which requires the
cylinder output and a pressure valve on the return side. The
cylinder may not operate if the valves are installed on the wrong
sides.
Working stroke
Return stroke
3. If a closed-center, exhaust-center, pressure-center or perfect
solenoid valve is used and the solenoid valve is set at the
center position, the cylinder may move to the position where
the pressure balance and load balance are achieved.
ASQ
Series
Tightening Torque
Width across flats Nominal size of adjustable
N m mm angle wrench mm
•
17
21
25
Operating
Pressure Valve Flow Valve
Series ASR Series ASQ
200
200
250
12
800-999-7378