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2. Specific Product Precautions
Design/ Selection
Warning
(1) Confirm the specifications.
The products are designed to be used in
compressed air systems (including vacuum)
only.
Do not operate at pressures, temperatures, etc.,
beyond the range of specifications, as this can
cause damage or malfunction. (Refer to the
specifications.)
Please contact SMC when using a fluid other
than compressed air (including vacuum).
We do not guarantee against any damage if the
product is used outside of the specifications
range.
(2) Do not disassemble the product or make any
modifications,
machining.
Doing so may cause human injury and/or an
accident.
(3) Sonic conductance (C) and critical pressure
ratio
(b)
values
representative values.
(4) Check if PTFE can be used in application.
PTFE powder (Polytetrafluoroethylene resin) is
included in the seal material of the male thread
type piping taper thread. Confirm that the use of
it will not cause any adverse effect on the system.
Please contact SMC if the Safety Data Sheet
(SDS) is required.
(5) The pilot check valve is a product aimed at
the control of the actuator via a temporary
intermediate stop.
The pilot check valve is used for temporarily
stopping the actuator. Until a pilot signal is input,
the valve shuts off the flow path from 2 to 1 and
the actuator stops. When a pilot signal is input,
the flow path from 2 to 1 is opened. When the
residual pressure exhaust button is operated, all
flow paths (2 to 1, 21, and exhaust port) are
opened.
Residual pressure
exhaust button (ø2.9)
including
additional
for
products
Exhaust Port
Exhaust
Port
Design/ Selection
Warning
(6) The product cannot be used for accurate and
precise intermediate stop of the actuator.
Due to the compressibility of air as a fluid, the
actuator will continue to move until it reaches a
position of pressure balance, even though the
pilot check valve closes with an intermediate
stop signal.
(7) The product cannot be used for retention of
the stop position for long hours.
Pilot check valve and actuators are not
guaranteed for zero air leakage. Therefore, it is
sometimes not possible to hold a stop position
for extended period of time. In the event that
holding for an extended time is necessary, a
mechanical means for holding should be
devised.
(8) When "AKP-*-M5" or "AKP-*-U10" is used,
pay attention to the residual pressure on the
port 1 side.
Due to the residual pressure on the port 1 side,
the responsiveness of the intermediate stop of
are
the actuator may become slower. Use "AKP-*-
M5" or "AKP-*-U10" in a circuit in which an
exhaust center valve is used so that no residual
pressure is generated on the port 1 side.
(9) Pay attention to the residual pressure within
the actuator at the time of intermediate stop.
When the actuator is stopped at the intermediate
position by this product, there may be pressure
contained inside the actuator, therefore the
actuator may suddenly move when the residual
pressure is released. Before operating the
residual pressure exhaust button, confirm that
the surrounding area is secure from any
potential hazards or accidents occurring.
(10) Use this product after checking the
surrounding areas in advance before the
release of residual pressure.
The actuator may move at a speed quicker
than the intended speed from the original circuit
set up when exhausting from the residual
pressure release. Confirm this speed will not
create additional hazards and pay attention to
the air discharged from the exhaust port.
-4-
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