SMC Networks KE Series User manual

Doc. No. DOC1023894
Product Name
Residual Pressure Release Valve
with One-touch Fitting
Model/ Series/ Product Number
KE series
Model/ Series/ Product Number
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Contents
1. Safety Instructions 2 ～ 3
2. Specific Product Precautions 4 ～ 9
3. Specifications 10
4. Product outline 10
5. Troubleshooting 11
6. Construction and parts 11 ～ 12
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Safety Instructions
These safety instructions are intended to prevent hazardous situations and/or equipment damage.
These instructions indicate the level of potential hazard with the labels of “Caution,” “Warning” or “Danger.”
They are all important notes for safety and must be followed in addition to International Standards
(ISO/IEC)
*1)
, and other safety regulations.
*1) ISO 4414: Pneumatic fluid power -- General rules relating to systems.
ISO 4413: Hydraulic fluid power -- General rules relating to systems.
IEC 60204-1: Safety of machinery -- Electrical equipment of machines .(Part 1: General requirements)
ISO 10218: Manipulating industrial robots -Safety.
etc.
Caution
Caution
indicates a hazard with a low level of risk which, if not avoided, could result
in minor or moderate injury.
Warning
Warning
indicates a hazard with a medium level of risk which, if not avoided, could
result in death or serious injury.
Danger
Danger
indicates a hazard with a high level of risk which, if not avoided, will result
in death or serious injury.
Warning
1. The compatibility of the product is the responsibility of the person who designs the equipment or
decides its specifications.
Since the product specified here is used under various operating conditions, its compatibility with specific
equipment must be decided by the person who designs the equipment or decides its specifications based on
necessary analysis and test results.
The expected performance and safety assurance of the equipment will be the responsibility of the person who
has determined its compatibility with the product.
This person should also continuously review all specifications of the product referring to its latest catalog
information, with a view to giving due consideration to any possibility of equipment failure when configuring the
equipment.
2. Only personnel with appropriate training should operate machinery and equipment.
The product specified here may become unsafe if handled incorrectly.
The assembly, operation and maintenance of machines or equipment including our products must be
performed by an operator who is appropriately trained and experienced.
3. Do not service or attempt to remove product and machinery/equipment until safety is confirmed.
1.The inspection and maintenance of machinery/equipment should only be performed after measures to
prevent falling or runaway of the driven objects have been confirmed.
2.When the product is to be removed, confirm that the safety measures as mentioned above are implemented
and the power from any appropriate source is cut, and read and understand the specific product precautions
of all relevant products carefully.
3. Before machinery/equipment is restarted, take measures to prevent unexpected operation and malfunction.
4. Contact SMC beforehand and take special consideration of safety measures if the product is to
be used in any of the following conditions.
1. Conditions and environments outside of the given specifications, or use outdoors or in a place exposed to
direct sunlight.
2. Installation on equipment in conjunction with atomic energy, railways, air navigation, space, shipping,
vehicles, military, medical treatment, combustion and recreation, or equipment in contact with food and
beverages, emergency stop circuits, clutch and brake circuits in press applications, safety equipment or
other applications unsuitable for the standard specifications described in the product catalog.
3. An application which could have negative effects on people, property, or animals requiring special safety
analysis.
4.Use in an interlock circuit, which requires the provision of double interlock for possible failure by using a
mechanical protective function, and periodical checks to confirm proper operation.
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Safety Instructions
Caution
1. The product is provided for use in manufacturing industries.
The product herein described is basically provided for peaceful use in manufacturing industries.
If considering using the product in other industries, consult SMC beforehand and exchange
specifications or a contract if necessary.
If anything is unclear, contact your nearest sales branch.
Limited warranty and Disclaimer/Compliance Requirements
The product used is subject to the following “Limited warranty and Disclaimer” and “Compliance
Requirements”.
Read and accept them before using the product.
Limited warranty and Disclaimer
1.The warranty period of the product is 1 year in service or 1.5 years after the product is delivered
whichever is first.  2)
Also, the product may have specified durability, running distance or replacement parts. Please
consult your nearest sales branch.
2. For any failure or damage reported within the warranty period which is clearly our responsibility,
a replacement product or necessary parts will be provided.
This limited warranty applies only to our product independently, and not to any other damage
incurred due to the failure of the product.
3. Prior to using SMC products, please read and understand the warranty terms and disclaimers
noted in the specified catalog for the particular products.

 2)
Vacuum pads are excluded from this 1 year warranty.
A vacuum pad is a consumable part, so it is warranted for a year after it is delivered.
Also, even within the warranty period, the wear of a product due to the use of the vacuum
pad or failure due to the deterioration of rubber material are not covered by the limited
warranty.
Compliance Requirements
1. The use of SMC products with production equipment for the manufacture of weapons of mass
destruction (WMD) or any other weapon is strictly prohibited.
2. The exports of SMC products or technology from one country to another are governed by the
relevant security laws and regulation of the countries involved in the transaction. Prior to the
shipment of a SMC product to another country, assure that all local rules governing that export
are known and followed.
Caution
SMC products are not intended for use as instruments for legal metrology.
Measurement instruments that SMC manufactures or sells have not been qualified by type approval tests
relevant to the metrology (measurement) laws of each country.
Therefore, SMC products cannot be used for business or certification ordained by the metrology
(measurement) laws of each country.
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2. Specific Product Precautions (1)
Warning
(1) Check the specifications.
The product in this catalog is designed to be
used in compressed air systems (including
vacuum) only.
If the product is used in an environment where
pressure or temperature is out of the specified
range, damage and/or malfunction may result.
(Refer to the specifications.)
Please consult with 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 specification
range.
(2) Do not disassemble the product or make
any modifications, including additional
machining.
It may cause human injury and/or an accident.
(3) When operating at a high temperature, the
fittings and tubing will also become very
hot.
Touching the product may result in burns, so
be sure to take safety measures before
coming into direct contact with the product.
Caution
(1) Keep the connection part of fittings and
tubing from rotating or oscillating
movement. Use Rotary One-touch Fittings
(KS or KX Series) in these cases.
The fittings may be damaged if they are used in
the above manner.
(2) The tubing bending radius in the vicinity of
the fitting should be at least the minimum
bending radius of the tubing.
If the bending radius is less than the minimum
value, fittings may damage, or tubing may crack
or be crushed. The minimum bending radius of
the FR soft nylon tubing (TRS series), FR
double layer tubing (TRB series), antistatic soft
nylon tubing (TAS series), polyolefin tubing
(TPH series), and soft polyolefin tubing (TPS
series) is measured as following in accordance
with JISB8381.Tubing deformation ratio at the
minimum bending radius is obtained through
the following formula, based on tubing diameter
and mandrel diameter by winding the same
radius mandrel tube.
Tube deformation ratio at the
minimum bending radius
Here, η: Deformation ratio (%)
d: Tubing diameter (mm)
L: Measured length (mm)
D: Mandrel diameter (mm)
(Twice against the minimum
bending radius)
Test temperature: 20  5oC
Relative humidity: 65  5 (%)
(3) Do not use fluids other than listed on the
specifications.
Applicable fluid is air. Please consult with SMC
if using other fluids.
(4) Depending on the storage or operating
environment and the period of storage or
use, the surface of the brass (C3604) may
blacken. If the discoloration of the brass is a
problem, we recommend selecting
electroless nickel-plated brass instead.
Example) KEC-02-X2
(5)
The dimensions shown in the dimension drawings
are merely reference dimensions. The actual
dimensions will vary depending on the tolerance.
Be sure to provide sufficient clearance around the
fitting for piping. Please contact SMC if you are
planning to mount the product in a narrow space
Warning
(1) Operation Manual
Install the products and operate them only after
reading the operation manual carefully and
understanding its contents. Also, keep the
manual where it can be referred to as
necessary.
(2) Ensure sufficient space for maintenance
activities.
When installing the products, allow access for
maintenance.
(3) Adhere to the thread tightening method.
When installing the products, refer to
"Connection Thread Tightening Method".
(4) There may be cases of the tubing detaching
from the fitting and thrashing around
uncontrollably due to tubing degradation or
fitting breakage.
To prevent the situation from becoming
uncontrollable, fit the tubing with a protective
cover or fix it in place.
Caution
(1) Preparation before piping
Before piping is connected, it should be
thoroughly blown out with air (flushing) or
washed to remove chips, cutting oil and other
debris from inside the pipe.
(2) Winding of sealant tape
When screwing together pipes and fittings, etc.,
be certain that chips from the pipe threads and
sealant does not get inside the pipe. Also, when
the sealant tape is used, leave approximately 1
thread ridges exposed at the end of the threads.
Design/Selection
Mounting/ Piping
Design/Selection
Mandrel
100
2d
D-L
1
η







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Caution
(3) Check the model, type and size before
installation.
Also, confirm that there are no scratches,
gouges or cracks on the product.
(4) When connecting the tubing, take pressure or
possible changes to the tubing length into
account, and allow a sufficient margin.
Failure to do so may result in fitting breakage or
detachment of the tubing. Refer to the
recommended piping conditions.
(5) Do not apply unnecessary forces such as
twisting, pulling, moment loads, vibration and
impact, etc. on fittings or tubing.
This will cause damage to fittings and will crush,
burst or release tubing.
(6) Tubing, with the exception of coiled tubing,
requires stationary installation. Do not use
standard tubing (non-coiled) in applications
where tubing is required to travel inside the
flexible protection tube. Tubing that travels
may sustain abrasion, extension, or severance
due to tensile force, or may result in removal of
tubing from fitting. Use caution prior to use for
proper application.
(7) To install the fitting, screw the fitting into the
hexagonal face of the body, and tighten with
an appropriate wrench.
Affix the wrench at the base of the thread. If the
size of hexagonal face and wrench do not match,
or tightening takes place near the tube side, it may
cause collapse or deformation of the hexagonal
face, or damage to the equipment. After installing,
confirm that there is no damage to the fitting, etc.
Warning
(1) Type of fluids
Please consult with SMC when using the product
in applications other than compressed air.
Regarding products for general fluids, please
contact SMC concerning applicable fluids.
(2) When there is a large amount of drainage.
Compressed air that contains a large amount of
drainage can cause malfunction of pneumatic
equipment. An air dryer or water droplet separator
should be installed upstream from filters.
(3) Drain flushing
If condensation in the drain bowl is not emptied on
a regular basis, the bowl will overflow and allow
the condensation to enter the compressed air
lines. It causes malfunction of pneumatic
equipment. If the drain bowl is difficult to check
and remove, installation of a drain bowl with an
auto drain option is recommended.
For details on the above compressed air quality,
refer to SMC's Best Pneumatics catalog.
(4) Use clean air.
Do not use compressed air that contains
chemicals, synthetic oils including organic
solvents, salt or corrosive gases, etc., as it can
cause damage or malfunction.
Caution
(1) Install an air filter.
Install an air filter at the upstream side of valve.
Select an air filter with a filtration degree of 5μm
or finer.
(2) Install an after cooler, air dryer or water
droplet separator, etc.
Compressed air that contains a large amount of
drainage can cause malfunction of pneumatic
equipment. Therefore,take appropriate measures
to ensure air quality, such as by providing an
aftercooler, air dryer or water droplet separator.
(3) Ensure that the fluid and ambient temperature
are within the specified range.
If the fluid temperature is 5
o
C or less, the
moisture in the circuit could freeze, causing
damage to the seals and leading to equipment
malfunction. Therefore, take appropriate
measures to prevent freezing.
For details on the above compressed air quality,
refer to SMC's Best Pneumatics catalog.
Warning
(1) Do not use in an atmosphere having corrosive
gases, chemicals, sea water, water, water
steam, or where there is direct contact with
any of these.
Refer to each construction drawing on the
Residual Pressure Release Valve with One-touch
Fitting material.
(2) Do not expose the product to direct
sunlight for an extended period of time.
(3) Do not use in a place subject to heavy
vibration and/or shock.
(4) Do not mount the product in locations
where it is exposed to radiant heat.
(5) Do not use the ordinary fittings and tubing
in locations where static electricity would
be problematic.
It may result in the system failure and trouble.
(6) Do not use the ordinary fittings and tubing
in locations where spatter is generated.
Spattering may result in a fire hazard.
(7) Do not use in an environment where the
product is directly exposed to cutting oil,
lubricant, coolant oil, etc.
Please contact SMC if using for an
environment exposed to cutting oil, lubricant or
coolant oil, etc.
Air Supply
Operating Environment
Mounting/ Piping
Air Supply
2. Specific Product Precautions (2)
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Warning
(8) Take note that if nylon tubing and soft
nylon tubing are used in a clean room.
The antioxidant on the surface of the soft
nylon tubing may come off, thereby lowering
the cleanness level.
(9) Do not use in environments where foreign
matter may stick to the product or get
mixed in the product's interior.
This may cause leakage or disconnection of
the tubing.
Warning
(1) Perform maintenance inspection according
to the procedures indicated in the operation
manual.
If handled improperly, malfunction and damage
of machinery or equipment may occur.
(2) Maintenance work
If handled improperly, compressed air can be
dangerous. Assembly, handling, repair and
element replacement of pneumatic systems
should be performed by a knowledgeable and
experienced person.
(3) Drain flushing
Remove drainage from air filters regularly.
(4) Removal of equipment, and supply/exhaust
of compressed air
When components are removed, first confirm
that measures are in place to prevent workpiece
from dropping, run-away equipment, etc. Then,
cut the supply pressure and electric power, and
exhaust all compressed air from the system
using the residual pressure release function.
When machinery is restarted, proceed with
caution after confirming that appropriate
measures are in place to prevent cylinders from
sudden movement.
Caution
(1) Be certain to wear safety glasses at all times
during periodical inspections.
(2) Replace fittings or tubing having the
following problems.
a) Cracks, gouges, wearing, corrosion
b) Air leakage
c) Twists or crushing of tubing
d) Hardening, deterioration or softening of tubing
(3) When replacing tubes or fittings, do not try
to mend or repair and then reuse them.
Caution
(1) Installation and removal of tubing for
One-touch fittings
a) Installation of tubing
1. Cut the tubing perpendicularly, being careful
not to damage the outside surface. Use an
SMC tube cutter TK-1, 2, 3, 5 or 6. Do not cut
the tubing with pliers, nippers, scissors, etc.,
otherwise, the tubing will be deformed and
trouble may result.
2) The outside diameter of the polyurethane
tubing swells when internal pressure is
applied to it. Therefore, it may be possible that
the tubing cannot be re-inserted into the
One-touch fitting. Check the tubing outside
diameter, and when the accuracy of the
outside diameter is +0.07mm or larger for ø2,
+0.15mm or larger for other sizes, insert into
the One-touch fitting again, without cutting the
tubing to use it. When the tubing is re-inserted
into the One-touch fitting, confirm that the
tubing goes through the release button
smoothly.
3. Grasp the tubing, slowly push it straight (0 to
5
o
into the One-touch fitting until it comes to a
stop. Refer to the table below for the length
for inserting the tube.
4. Pull the tubing back gently to make sure it has
a positive seal. Insufficient installation may
cause air to leak or the tubing to release.
As a guide for checking the tubing is not
pulled out, refer to the following table.
Tubing size Insertion length [mm]

6
17

8
18.5

10
21

12
22
Tubing size
Tensile force of tubing

6
12

8
20

10
30

12
35
Maintenance
Mounting/Piping
Operating Environment
One-touch Fitting
2. Specific Product Precautions (3)
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Caution
b) Removal of tubing
1. Press the release button flange evenly and
sufficiently to release the tube. Do not push
in the tubing before pressing the release
button.
2. Pull out the tubing while keeping the release
button depressed. If the release button is not
held down sufficiently, the tubing cannot be
withdrawn.
3. To reuse the tubing, remove the previously
lodged portion of the tubing. If the lodged
portion is left on without being removed, it
may result in air leakage and removal of the
tubing difficult.
(2) Connecting products with metal rods
After attaching products with attached metal
rods (KC series, old KQ series, KN series,
and KM series) to the One-touch fitting, do
not use tubes, resin plugs, or reducers, etc.
Caution
(1) Fittings with sealant: R
a) First, tighten the fitting by hand, then use a
wrench appropriate for the hexagon flats of the
body to tighten it a further two or three turns.
For a tightening torque guide, see the table
below.
b) If the fitting is tightened with excessive torque,
a large amount of sealant will seep out.
Remove the excess sealant.
c) Insufficient tightening may cause seal failure,
or loosen the threads.
d) Reuse
1. Normally, fittings with a sealant can be reused 2
to 3 times.
2. To prevent air leakage through the sealant,
remove any loose sealant stuck to the fitting by
blowing air over the threaded portion.
3. If the sealant no longer provides effective
sealing, wind sealing tape over the sealant
before reusing. Do not use the sealant in any
form other than a tape type.
4. Once the fitting has been tightened, backing it
out to its original position often causes the
sealant to become defective. Air leakage will
occur.
Caution
Use a wrench appropriate for the hexagon flats of
the body to tighten the fitting.
Affix the wrench at the base of the thread. If the size
of hexagonal face and wrench do not match, or
tightening takes place near the tube side, it may
cause collapse or deformation of the hexagonal
face, or damage to the equipment.
After installing, confirm that there is no damage to
the fitting, etc.
Connection Thread Tightening Method
Connection thread size
Tightening torque
[N ・ m]
R1/4 8
～ 12
R3/8 15 ～ 20
Tightening tool One-touch Fitting
Mounting/Piping
2. Specific Product Precautions (4)
Recommended
Recommended
Not recommended
Not recommended
Not recommended
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Caution
(1) When connecting piping to the One-touch
fitting, use pipe length with sufficient margin,
in accordance with the piping conditions
shown in Fig. 1.
Also, when using a tying band, etc., to bind
the piping together, make sure that external
force does not come to bear on the fitting
(See Fig.2).
取付ピッチ A
ストレート部
Fig.1 Recommended piping
Unit: mm
ＮＧ
Fig. 2 When using a tying band to bind the piping together
Recommended piping conditions
Recommended Piping Conditions
Tubing
size
Mounting pitch A Straight
line
length
Nylon tubing
Soft nylon
tubing
Polyurethane
tubing

6 84 or more 66 or more 39 or more 30 or
more

8 112 or more 88 or more 52 or more 40 or
more

10 140 or more 110 or more 69 or more 50 or
more

12 168 or more 132 or more 88 or more 60 or
more
2. Specific Product Precautions (5)
Straight line
Mounting
pitch A
Recommended
Not recommended
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Caution
(1) Push button must be vertically operated
by hand. Do not use tools or any other
methods of operation. The product may be
damaged otherwise.
(2) Make sure that no lateral load is applied.
Lateral loads may damage the product or
cause an exhaust failure.
(3) Make sure that no foreign matter enters
the product to avoid leakages and exhaust
failures.
Caution
(1) When using a tubing other than from SMC,
be careful of the tolerance of the tubing O.D.
and tubing material.
a) Nylon tubing Within +/-0.1 mm
b) Soft nylon tubing Within +/-0.1 mm
c) Polyurethane tubing Within +0.15 mm,
Within -0.2 mm
Do not use the tubing which does not satisfy the
specified tubing O.D. accuracy, or if the tubing
has a different I.D., material, hardness, or
surface roughness from those of SMC's tubing.
Please consult with SMC if there is anything
unclear.
It may cause difficulty in connecting the tubing,
leakage, disconnection of the tubing, or fitting
damage.
(2) When using fittings other than those from
SMC, be certain to confirm that operating
conditions are such that no problems will
arise.
Tubing
Design/Selection
Push Button Operation
2. Specific Product Precautions (6)
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3. Specifications
4. Product outline
Residual pressure in the cylinder can be easily released with one push of the push button.
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5. Troubleshooting
Residual Pressure Release Valve with One-touch Fitting / KE Series cannot be disassembled or
repaired in order to quality maintenance.
When failure such as "Non-removable tubing" " Air leakage " occurs, please replace the whole product.
6. Construction
No.
Part name
Material
Qty
Remarks
1 Cassette POM,Stainless steel304 2 Blue
2 Body PBT 1 Red
3 Seal NBR 2
4 Valve HNBR 1
5 Valve guide Brass 1
6 Rod Brass 1
7 Push Button POM 1 Red
8 Spring Stainless steel304-WPB 1
9 Push nut Stainless steel304 1
With One-touch fitting without a push button guard
：
KEA
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No.
Part name
Material
Qty
Remarks
1 Cassette POM,Stainless steel304 2 Blue
2 Body PBT 1 Red
3 Seal NBR 2
4 Valve HNBR 1
5 Valve guide Brass 1
6 Rod Brass 1
7 Push Button POM 1 Red
8 Spring Stainless steel304-WPB 1
9 Push nut Stainless steel304 1
With One-touch fitting with a push button guard
：
KEB
No.
Part name
Material
Qty
Remarks
1 Stud Brass 2
2 Body PBT 1 Red
3 O-Ring NBR 2
4 Valve HNBR 1
5 Valve guide Brass 1
6 Rod Brass 1
7 Push Button POM 1 Red
8 Spring Stainless steel304-WPB 1
9 Push nut Stainless steel304 1
Rc thread with a push button guard
：
KEC
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Revision history
4-14-1, Sotokanda, Chiyoda-ku, Tokyo 101-0021 JAPAN
Tel: + 81 3 5207 8249 Fax: [phone]
URL http://www.smcworld.com
NOTE: Specifications are subject to change without prior notice and any obligation on the part of the manufacturer.
© 2023 SMC Corporation All Rights Reserved
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