SMC Networks VND Series User manual

Doc.no.VN-OMA0013-D
Steam Valve
PRODUCT NAME
VND Series
MODE / Series

VN-OMA0013-D
Contents
Safety Instructions ----------------------------------------------------------------------------------- 2,3
Precautions on Design ---------------------------------------------------------------------------- 4
Selection ----------------------------------------------------------------------------------------------- 4
Mounting ----------------------------------------------------------------------------------------------- 4
Piping --------------------------------------------------------------------------------------------------- 5
Operating Environment ----------------------------------------------------------------------------- 5
Maintenance ------------------------------------------------------------------------------------------- 5
Precautions -------------------------------------------------------------------------------------------- 5
Specific Product Precautions ---------------------------------------------------------------------- 6
Troubleshooting -------------------------------------------------------------------------------------- 7
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VN-OMA0013-D
Safety Instructions
These safety instructions are intended to prevent hazardous situations and/or e uipment 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 e uipment of machines .(Part 1: General re uirements)
ISO 10218-1992: 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
e uipment must be decided by the person who designs the e uipment or decides its specifications based on
necessary analysis and test results.
The expected performance and safety assurance of the e uipment 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 e uipment failure when configuring the
e uipment.
2. nly 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 e uipment 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/e uipment 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/e uipment 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 e uipment in conjunction with atomic energy, railways, air navigation, space, shipping,
vehicles, military, medical treatment, combustion and recreation, or e uipment in contact with food and
beverages, emergency stop circuits, clutch and brake circuits in press applications, safety e uipment 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 re uiring special safety
analysis.
4.Use in an interlock circuit, which re uires 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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VN-OMA0013-D
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
Re uirements”.
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 regulations 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.

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VN-OMA0013-D
Warning
Warning
Warning
Design
1. Cannot be used as an emergency shutoff
valve, etc.
The valves presented in this catalog are not designee for safety
applications such as an e ergency shutoff valve. If the valves
are used in this type of syste , other reliable safety assurance
easures should also be adopted.
2. Ensure sufficient space for maintenance ac-
tivities.
When installing the products, allow access for aintenance.
3. iquid rings
In cases with a flowing liquid, provide a by-pass valve in the
syste to prevent the liquid fro entering the liquid seal circuit.
4. Actuator drive
When an actuator, such as a cylinder, is to be driven using a
valve, take appropriate easures to prevent potential danger
caused by actuator operation.
5. Pressure (including vacuum) holding
It is not usable for an application such as holding the pressure
(including vacuu ) inside of a pressure vessel because leakage
is entailed in a valve.
6. When an impact, such as water hammer, etc.,
caused by the rapid pressure fluctuation is
applied, the valve may be damaged. Give an
attention to it.
Selection
1. Confirm the specifications.
Give careful consideration to the operating conditions such as
the application, fluid and environ ent, and use within the
specified operating ranges in this catalog.
2. Fluids
1) Type of fluids
Before using a fluid, confir whether it is co patible with the
aterials fro each odel by referring to the fluids listed in
the catalog.
If there is so ething you do not know, please contact SMC.
2) Corrosive gas
Cannot be used since it will lead to cracks by stress corrosion
or result in other incidents.
3) When a bronze body is used, then depending on water quality,
corrosion and internal leakage ay occur. If such abnor ali-
ties occur, exchange the product for a stainless steel body.
3. Fluid quality
The use of a fluid that contains foreign atter can cause prob-
le s such as alfunction and seal failure by pro oting wear of
the valve seat, and by transfor ation of valve ele ent, etc.
Install a suitable filter (strainer) i ediately upstrea fro the
valve. As a general rule, use 80 to 100 esh.
When used to supply water to boilers, substances such as
calciu and agnesiu which generate hard scale and sludge
are included. Since this scale and sludge can cause the valve to
alfunction, install water softening equip ent, and a filter
(strainer) directly upstrea fro the valve to re ove these
substances.
4. Air quality
1) Use clean air.
Do not use co pressed air that contains che icals, synthetic
oils including organic solvents, salt or corrosive gases, etc.,
as it can cause da age or alfunction.
2) Install air filters.
Install air filters close to valves at their upstrea side. A
filtration degree of 5μ or less should be selected.
3) Install an aftercooler or air dryer, etc.
Co pressed air that contains excessive drainage ay cause
alfunction of valves and other pneu atic equip ent. To
prevent this, install an aftercooler or air dryer, etc.
4) If excessive carbon powder is generated, eliminate it by
installing mist separators at the upstream side of valves.
If excessive carbon powder is generated by the co pressor,
it ay adhere to the inside of the valves and cause
alfunction.
Refer to SMC’s Best Pneu atics catalog for further details on
co pressed air quality.
5. Ambient environment
Use within the operable a bient te perature range. Confir
the co patibility between the product’s co position aterials
and the a bient at osphere. Be certain that the fluid used does
not touch the external surface of the product.
6. ow temperature operation
1) The valve can be used in an a bient te perature of -5
o
C.
However, take easures to prevent freezing or solidification
of i purities, etc.
2) When using valves for water application in cold cli ates, take
appropriate counter easures to prevent the water fro free-
zing in tubing after cutting the water supply fro the pu p, by
draining the water, etc. Installation of a dryer, heat retaining of
the body is reco ended to prevent a freezing condition in
which the dew point te perature is high and the a bient
te perature is low, and the high flow runs.
7. Do not disassemble the product or make any
modifications, including additional machining.
It ay cause hu an injury and/or an accident.
Mounting
1. If air leakage increases or equipment does not
operated properly, stop operation.
After ounting is co pleted, confir that it has been done
correctly by perfor ing a suitable function test.
body only. They can cause the coil to burn out.
2. Secure with brackets, except in the case of
steel piping and copper fittings.
3. Avoid sources of vibration, or adjust the arm
from the body to the minimum length so that
resonance will not occur.
4. Painting and coating
Warnings or specifications printed or labeled on the product
should not be erased, re oved or covered up.
VND Series
Valves for Fluid Control
Precautions 1
Be sure to read
this
before handling.

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VN-OMA0013-D
Warning
Warning
Warning
Piping
1. Preparation before piping
Before piping is connected, it should be thoroughly blow out
with air (flushing) or washed to re ove chips, cutting oil and
other debris fro inside the pipe.
Install piping so that it does not apply pulling, pressing, bending
or other forces on the valve body.
2. Wrapping of pipe tape
When connecting pipes, fittings,
etc., be sure that chips fro the
pipe threads and sealing ateri-
al do not enter the valve.
Further ore, when pipe tape is
used, leave 1.5 to 2 thread rid-
ges exposed at the end of the
threads.
3. Avoid connecting ground lines to piping, as
this may cause electric corrosion of the sys-
tem.
4. Tighten threads with the proper tightening
torque.
When attaching fittings to valves, tighten with the proper tight-
ening torque shown below.
Tightening Torque for Piping
Connection thread Proper tightening torque (
((
(N･
･･
･m)
Rc1/8 7 to 9
Rc1/4 12 to 14
Rc3/8 22 to 24
Rc1/2 28 to 30
Rc3/4 28 to 30
Rc1 36 to 38
Rc1 1/4 40 to 42
Rc1 1/2 48 to 50
Rc2 48 to 50
5. Connection of piping to products
When connecting piping to a product, refer to its operation
anual to avoid istakes regarding the supply port, etc.
6. Steam generated in a boiler contains a large
amount of drainage. Be sure to operate it with a
drain trap installed.
Operating Environment
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 .
2. Do not use in explosive atmospheres.
3. Do not use in locations subject to vibration or
impact.
4. Do not use in locations where radiated heat will
be received from nearby heat sources.
5. Employ suitable protective measures in loca-
tions where there is contact with water drop-
lets, oil or welding spatter, etc.
Maintenance
1. Removal of product
The valve will reach a high te perature when used with high
te perature fluids. Confir that the valve te perature has
dropped sufficiently before perfor ing work. If touched inadver-
tently, there is a danger of being burned.
1) Shut off the fluid supply and release the fluid pressure in the
syste .
2) Shut off the power supply.
3) Dis ount the product.
2. ow frequency operation
Switch valves at least once every 30 days to prevent
alfunction. Also, in order to use it under the opti u state,
conduct a regular inspection once a half year.
1. Filters and strainers
1. Be careful regarding clogging of filters and strainers.
2. Replace filter ele ents after one year of use, or earlier if the
pressure drop reaches 0.1MPa.
3. Clean strainers when the pressure drop reaches 0.1MPa.
2. ubrication
When using after lubricating, never forget to lubricate
continuously.
3. Storage
In case of long ter storage after use with heated water,
thoroughly re ove all oisture to prevent rust and
deterioration of rubber aterials, etc.
4. Exhaust the drainage from an air filter period-
ically.
Precautions
1. Valves will reach high temperatures from high
temperature fluids. Use caution, as there is a
danger of being burned if a valve is touched
directly.
2. For pilot type 2-port valves, when the valve is
closed, sudden pressure resulting from the
startup of the fluid supply source (pump,
compressor, etc.) may cause the momentary
valve to open and leakage to occur, so please
exercise caution.
3. When problems are caused by a water hammer,
install water hammer relief equipment
(accumulator, etc.).
Caution
VND Series
Valves for Fluid Control
Precautions 2
Be sure to read
this
before handling.
Caution

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VN-OMA0013-D
External Pilot
Piping of pilot port [12(P1), 10(P2)]
P1 and P2 piping should be as follows according to the odel.
Port VND□0□D VND□02D
12(P1) External Pilot Bleed port
10(P2) Bleed port External Pilot
Installing a silencer to the exhaust port and the bleed port is
reco ended for noise reduction and for dust entry prevention.
Piping
To use the piping with a high te perature fluid, use heat resistant
fittings and tubing (Self-align fittings, Fluoropoly er tubing , Copper
piping, etc.).
Adiabatic Space
There is a space between body and cover (∗: approxi ate 1 )
for adiabatic effect.
Caution
Caution
Caution
12(P1) port 10(P2) port
2(B) port
1(A) port
∗
V D Series
Valves for Fluid Control
Specific Product Precautions 1
Be sure to read
this
before handling.

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VN-OMA013-D
TROUBLESHOOTING
Measures
In addition, in the case of trouble, please send it back to the supplier for repair or replace ent.
(4)
(5)
(1)
- Prohibited way of using the valve which is written at "Precautions" section in this operation anual was
carried out excluding above- entioned.
- Lubrication has been stopped inter ediately, or lubrication was suspended te porary.
- Strong i pact was given.
(5) Check the pilot air valve and pilot air pressure.
Sealing failure
(4)
Deterioration of defor ation of seals.
Air leakage at connected part.
(6)
No.
Pilot air pressure is not exhausted.
Pilot pressure is getting lower.
In case of intrusion of foreign atter, to re ove foreign atter by air blow of piping and then replace valve.
Reverses flow direction. (2)
Incorrect piping of pilot port. (3)
Ensure the hu idity at piping and the valve has declined sufficiently, and there is no pressure left in the
syste before replacing the solenoid valve.
Measures
If no i prove ent is achieved in spite of the above counter easure, inside of the valve ay have so e
abnor ality. In this case, stop using the valve i ediately.
Flow does not start.
Flow does not stop.
Possible cause
Operation failure
Content of failure
Foreign atters between the valve and valve seat.
(1)
Pressure range outside of specification.
Check the possible cause according to the content of failure in order of possibility, and take easures.
If any of followings are carried out, inside of the valve ay have so e failure. In this case, stop using
the valve i ediately.
Re edy
Check the flow direction and connect piping.
Correct piping.
Adjust the pressure within the specification.
(2)
(3)
(6) Replace valve.
Warning

VN-OMA0013-D
S
Revision history
□
B Renewal oo
□
C Safety Instructions Po
□
D Renewal RP
1st printing :oo
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Tel: + 81 3 5207 8249 Fax: [phone]
UR http://www.smcworld.com
Note: Specifications are subject to change without prior notice and any obligation on the part of the manufacturer.
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