3 Port Direct Operated Solenoid Valve VT307 Series

3 Port Direct Operated Solenoid Valve VT307 Series
Doc. No.VT307∗∗-OMH0001-C
3 Port Direct Operated Solenoid Valve
VT307 Series
MODEL/ Series
Safety Instructions -------------------------------------------------------------------------------
Precautions on Design / Selection -----------------------------------------------------------
Wiring ------------------------------------------------------------------------------------------------
Lubrication ------------------------------------------------------------------------------------------ 5
Air Supply ------------------------------------------------------------------------------------------- 6
Operating Environment -------------------------------------------------------------------------- 6
Maintenance ---------------------------------------------------------------------------------------- 6
Specific Product Precautions
------------------------------------------------------------------- 7,8
Troubleshooting ------------------------------------------------------------------------------------ 9
Remedy ---------------------------------------------------------------------------------------------- 10
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 10218-1992: Manipulating industrial robots -Safety.
Caution indicates a hazard with a low level of risk which, if not avoided, could result
Warning indicates a hazard with a medium level of risk which, if not avoided, could
in minor or moderate injury.
result in death or serious injury.
Danger indicates a hazard with a high level of risk which, if not avoided, will result
in death or serious injury.
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
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
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.
Safety Instructions
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
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
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
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 govemed 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 goveming that export
are known and followed.
VT307 Series
Precautions for 3 Port Solenoid Valve ①
Be sure to read before handling.
Design / Selection
10. Extended periods of continuous energization
・If a valve will be continuously energized for an extended
period of time, the temperature of the valve will increase due to
the heat generated by the coil. This will likely adversely affect
the performance of the solenoid valve and any nearby
peripheral equipment. Therefore, when it is continuously
energized or the energized period per day is longer than the
de-energized period use low power consumption specification,
or continuous energization type..
Also, please contact SMC because depending on the
application, there may be additional valves not mentioned
above that may be used (especially in DC specification).
In addition, it is possible to shorten the energized time by
making a valve with an N.O. (normally open) specification.
・ If valves are mounted on a control panel, please take
measures to release heat so that the temperature would fall
within the temperature specified for the valve.
Please note in particular that the temperature rise will be large
if three or more adjoining valves are continuously energised on
a manifold at the same time for an extended period of time.
1. Confirm the specifications.
Products represented in this manual are designed only for use
in compressed air systems (including vacuum).
Do not operate at pressures or 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 specification range.
2. Actuator drive
When an actuator, such as a cylinder, is to be driven using a
valve, take appropriate measures (cover installation or
approach prohibition) to prevent potential danger caused by
actuator operation.
3. Effect of back pressure when using a manifold
Use caution when valves are used on a manifold, because an
actuator may malfunction due to back-pressure.
For single acting sylinder, take appropriate measures to
prevent malfunction by using it with an individual exhaust
11. Do not disassemble the product or make any
modifications, including additional machining.
It may cause human injury and/or an accident.
4. Holding pressure (including vacuum)
1. Leakage voltage
Since the valves are subject to air leakage, they cannot be
used for applications such as holding pressure (including
vacuum) in a pressure vessel.
Take note that the leakage voltage will increase when a
resistor is used in parallel with switching element or a C-R
circuit (surge voltage suppressor) is used for protecting a
switching device because of the passing leakage voltage
through the C-R circuit.
The suppressor residual leakage voltage should be as follows.
5. Not suitable for use as an emergency shutoff valve,
The valves listed in this manual are not designed for safety
applications such as an emergency shutoff valve. If the valves
are used for the mentioned applications, additional safety
measures should be adopted.
6. Release of residual pressure
For maintenance purposes install a system for releasing
residual pressure.
7.. Operation in a vacuum condition
DC coil
When a valve is used for switching a vacuum, take measures
to install a suction filter or similar to prevent external dust or
other foreign matter from entering inside the valve. In addition,
at the time of vacuum adsorption, be sure to vacuum at all
times. Failure to do so may result in foreign matter sticking to
the adsorption pad, or air leakage causing the workpiece to
3% or less of rated voltage
AC coil 15% or less of rated voltage
2. Solenoid valve drive for AC with solid state output
(SSR, TRIAC output, etc.)
1) Current leakage
When using a snubber circuit (C-R element) for surge
protection of the output, a very small amount of electrical
current will continue to flow even during the OFF state. This
results in the valve not returning. In the a situation where the
tolerance is exceeded, as in the above case, take measures
to install a bleeder resistor.
2) Minimum allowable load amount(Min. load current)
When the consumption current of a valve is less than the
output’s minimum allowable load volume or the margin is small,
the output may not switch normally. Please contact SMC.
8. Regarding a vacuum switch valve and a vacuum
release valve
If a non-vacuum valve is installed in the middle of piping
system having a vacuum, the vacuum condition will not be
maintained. Use a valve designed for use under vacuum
9. Ventilation
Provide ventilation when using a valve in a confined area, such
as in a closed control panel. For example, install a ventilation
opening, etc. in order to prevent pressure from increasing
inside of the confined area.
3. Surge voltage suppressor
If a surge protection circuit contains nonstandard diodes, such
as Zener diodes or varistor, a residual voltage that is in
proportion to the protective circuit and the rated voltage will
remain. Therefore, take into consideration the surge voltage
protection of the controller. In the case of diodes, the residual
voltage is approximately 1 V.
VT307 Series
Precautions for 3 Port Solenoid Valve ②
Be sure to read before handling.
Design / Selection
3. Connection of fittings
When screwing fittings into valves, tighten as follows.
Tightening Torque for Piping
4. Operation in a low temperature condition
It is possible to operate a valve in extreme temperature, as low
as -10oC. Take appropriate measures to avoid freezing of
drainage, moisture etc. in low temperature.
5. Mounting orientation
Proper tightening Proper
tightening torque (N・・m )
Rc 1/8
Rc 1/4
Mounting orientation is free.
4. Piping to products
When piping to a product, refer to the instruction manual to
avoid mistakes regarding the supply port, etc.
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
1. Preparation before piping
When connecting power to a solenoid valve with a DC
specification and equipped with a light or surge voltage
suppressor, check for polarity.
If a mistake is mode regarding the polarity, Valve is not
2. Ensure sufficient space for maintenance activities.
When installing the products, allow access for maintenance.
3. Tighten threads with the proper tightening torque.
When installing the products, follow the listed torque
2. Applied voltage
4. If air leakage increases or equipment does not
operate properly, stop operation.
When electric power is connected to a solenoid valve, be
careful to apply the proper voltage. Improper voltage may
cause malfunction or coil damage.
Check mounting conditions when air and power supplies are
connected. Initial function and leakage tests should be
performed after installation.
3. Check the connections.
Check if the connections are correct after completing all wiring.
5. Painting and coating
Warnings or specifications printed or affixed to the product
should not be erased, removed or covered up.
Please consult with SMC before applying paint to resinous
parts, as this may have an adverse effect due to the solvent in
the paint.
1) The valve has been lubricated for life by the factory and does
not require any further.
2) If a lubricant is used in the system, use class 1 turbine oil (no
additive), ISO VG32.
Once a lubricant is used in the system, lubrication must be
continued because the original lubricant applied during
manufacturing will be washed away.
If turbine oil is used, refer to the Material Safety Data Sheet
(MSDS) of the oil.
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. Wrapping of pipe tape
When screwing piping or fittings into ports, ensure that chips
from the pipe threads or sealing material do not enter the
piping. Also, if pipe tape is used, leave 1 thread ridges
exposed at the end of the threads.
VT307 Series
Precautions for 3 Port Solenoid Valve ③
Be sure to read before handling.
Air Supply
3.Do not use in a place subject to heavy vibration
and/or shock.
4.The valve should not be exposed to prolonged
sunlight. Use a protective cover.
5.Remove any sources of excessive heat.
6.If it is used in an environment where there is
possible contact with a waterdrop, oil, weld spatter,
etc., exercise preventive measures.
7.When the solenoid valve is mounted in a control
panel or its energized for a long time, make sure
ambient temperatures is within the specification of
the valve.
1. Type of fluids
Please consult with SMC when using the product in
applications other than compressed air.
2. When there is a large amount of drainage.
Compressed air containing a large amount of drainage can
cause malfunction of pneumatic equipment. An air dryer or
water 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 compressed air quality, refer to SMC’s Best Pneumatics
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.
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.
2. Removal of equipment, and supply/exhaust of
compressed air
When components are removed, first confirm that measures
are in place to prevent workpieces from dropping, run-away
equipment, etc. Then, cut off the supply pressure and electric
power, and exhaust all compressed air from the system
using the residual pressure release function.
When the equipment is operated after remounting or
replacement, first confirm that measures are in place to
prevent lurching of actuators, etc. Then, confirm that the
equipment is operating normally.
1. When extremely dry air is used as the fluid,
degradation of the lubrication properties in side the
equipment may occur, resulting in reduced
reliability (or reduced service life) of the equipment.
Please consult with SMC.
2. Install an air filter.
Install an air filter upstream near the valve. Select an air filter
with a filtration size of 5 ㎛ or smaller.
3. Low frequency operation
Valves should be operated at least once every 30 days to
prevent malfunction. (Use caution regarding the air supply.)
3. Take measures to ensure air quality, such as by
installing an
4. Manual override operation
When the manual override is operated, connected equipment
will be actuated.
Operate after safety is confirmed.
Compressed air that contains a large amount of drainage can
cause malfunction of pneumatic equipment such as valves.
Therefore, take appropriate measures to ensure air quality,
such as by providing an aftercooler, air dryer, or water
1. Drain flushing
4. If excessive carbon powder is seen, install a mist
Remove drainage from the air filters regularly.
2. Lubrication
separator on the upstream side of the valve.
In the case of rubber seals, once lubrication has been started,
it must be continued.
Use class 1 turbine oil (with no additive), ISO VG32 because if
other lubricant oil is used, it may cause malfunction.
If excessive carbon dust is generated by the compressor, it
may adhere to the inside of a valve and cause it to
For compressed air quality, refer to SMC’s Best Pneumatics
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 an environment where flammable gas
or explosive gas exists. Usage may cause a fire or
explosion. The products do not have an explosion
proof construction.
VT307 Series
Specific Product Precautions ①
Be sure to read before handling.
How to Use DIN Terminal
Light/Surge Voltage Suppressor
1. Disassembly
1) After loosening the thread (1), then if the housing (2) is
pulled in the direction of the thread, the connector will be
removed from the body equipment (solenoid, etc.).
2) Pull the screw (1) out of the housing (2).
3) On the bottom part of the terminal block (3), there’s a
cut-off part (9). If a small flat head screwdriver is inserted
between the opening in the bottom, terminal block (3) will
be removed from the housing (2). (Refer to “Figure 1”.)
4) Remove the cable gland (4) and plan washer (5) and
rubber seal (6).
2. Wiring
1) Passing through the cable (7), cable gland (4), plain
washer (5), rubber seal (6) in this order, and then insert
into the housing (2).
2) From the terminal block (3), loosen the screw (11), then
pass the lead wire (10) through, then again tighten the
screw (11).
Note 1) Tighten within the tightening torque of 0.5
Note 2) Cable (7) external; φ6 to φ8 mm
Note 3) Crimped terminal like round-shape or Y shape
cannot be used.
3. Assembly
1) Passing cable gland (4), washer (5), rubber seal (6),
housing (2) in this order through cable (7) and connect to
terminal block (3) to the housing (2).
(Push it down until you hear the click sound.)
2) Putting rubber seal (6), plain washer (5), in this order into
the cable introducing slit on the housing (2), then further
tighten the cable gland (4) securely.
3) Insert the gasket (8) between the bottom part of terminal
block (3) and a plug attached to equipment, and then
screw (1) in from the top of the housing (2) to tighten it.
Note 1) Tighten within the tightening torque of 0.5
Note 2) Connector orientation can be changed by 180
degrees depending on how to assemble the
housing (2) and the terminal block (3).
AC, 100VDC or more
48 VDC or less
Electrical Connection
Din terminal and terminal (with light/surge voltage suppressor)
are connected inside as in the figure below. Connect to the
corresponding power supply.
Terminal no.
DIN terminal
・Applicable cable O.D.
Type T:φ4.5 to φ7mm
Type E:φ2.3 to φ2.8mm
Type D:φ6 to φ8 mm
・Applicable crimp terminal
Type E/T::1.25-3, 1.25-3S
1.25Y-3N, 1.25Y-3S
(Round or “Y” shaped crimped terminals can be not used for
type “D”.)
Connector for DIN Terminal
DIN connector
Part no.
Lead Wire Color
100 VAC
200 VAC
Red (+), Black (-)
VT307 Series
Specific Product Precautions ②
Be sure to read before handling.
Continuous On Time
Changing from N.C. to N.O
On the standard and low power consumption types, when the
valve is to be continuously engergized, ensure that it is
operated for no more than 1,400 hours (equivalent to approx. 2
months) in a year. Provide at least one operation every 30
In applications where the operating time exceeds 1,400 hours,
select the long-time energizing type which has specifically been
designed for long time operation. It should be noted, however,
that even with this type, the operation must be switched over at
least once a month. Consult us for use with special application
such as emergency curcuit breaker.
This product is delivered as N.C. valve.
If N.O. valve is needed, remove mounting screws of the
required valve and turn over the function plate. (Make sure that
there are gaskets on both sides of the plate.) Then, tighten the
mounting screws to fix the valve to the manifold base.
Vacuum Specifications
For vacuum specifications, use Model VT307V. In applications
where the vale is used in a dusty place, install a filter between
the vacuum cup, where used on the R port, and the valve. If
should be noted that this valve is not for vacuum retention.
Function plate
No mark
Port Direction
For the common exhaust type, pressurization or evacuation of
the R port can cause a malfunction.
1.Each valve is fixed to the manifold vase with two M4
mounting screws. Tighten the screws evenly when
2.For mounting, tighten M4 or equivalent screws evenly into the
mounting holes of the manifold base.
Tightening torque of he mounting screw(M4):1.4N・m
1.Use caution when valves are used on a manifold, because
an actuator may malfunction due to back-pressure.
Take appropriate measures to prevent malfunction by using it
with an individual exhaust manifold.
2.When mounting a valve on the manifold base, N.C. and N.O.
can be reversed by a function plate orientation. Also, since
cylinder also acts reversely, confirm if the function plate is
correctly mounted or not.
Function plate
Should any trouble be found during operation, trace the source of the trouble in the following order and take corrective action.
Trouble phenomenon
Faulty operation
Cause expected
Valve is not operated
Faulty wiring
Blown fuse or disconnected lead wire
Poor contact at connector wire or connector
Disconnected coil wire
Foreign matter caught in armature
Burnt coil
Air leaks through exhaust port [3(R)
port] of main valve.
∗[1(P) port] in case of N.O. valve.
Function plate fault.
Swollen valve seals
Excessive amount of lubricant
Higher voltage or wrong coil used
Coil splashed by water
W orn spool seal
Intrusion of foreign matter
Spool has not com pletely shifted
Air leaks between valve and
A big continuous buzzing sound
is emitted when the power is
turned on.
Poor seal on actuator (cylinders, etc.) side
Loose screws
Intrusion of foreign matter between gasket and valve
Foreign matter caught in core
W orn core
Low line voltage
Re-wire correctly.
Replace part.
Replace part or re-wire positively.
Replace valve.
Regulate pressure so that pilot pressure will fall within operating pressure range during operation.
・If wrong oil is used, completely air blow to remove oil, and replace valve. After valve is replaced,
use turbine oil class 1 (ISO VG32).
・When a large quantity of drain is given and cannot carry out drain omission surely, install either an
auto-drain or a dryer.The valve should be replaced.
Check voltage. Replace valve.
Protect the valve so that water does not splash the coil.
In case of intrusion of foreign matter, to remove foreign matter by air blow of piping and then replace
Repair or replace actuators.
After stopping air and re-tighten the bolts.
Reduce the amount of lubricant to the degree that no oil splashes out of the air exhaust port [3(R) port].
∗[1(P) port] in case of N.O. valve.
Regulate voltage,so that the voltage at the time of the operation becomes specifications range.
Match the function plate correctly.
Remove the foreign matter.
If no improvement is achieved in spite of the above countermeasure, inside of the valve may have some
abnomality. In this case, stop using the valve immediately.
If any of followings are carried out, inside of the valve may have some failure. In this case, stop using
the valve immediately.
1. Voltage out of rated voltage has been used.
2. Oil other than the specified one has been lubricated.
3. Lubrication has been stopped intermediately, or lubrication was suspended temporary.
4. Water splashed directely.
5. Strong impact was given.
6. Alien substance such as drain and particle got into. Drain or garbage invaded a valve.
7. Prohibited way of using the valve which is written at "Precautions" section in this operation manual
was carried out excluding above-mentioned.
In addition, in the case of trouble, please send it back to the supplier for repair or replacement.
- 10 VT307∗∗-OMH0001-C
Record of changes
A Renewal
B All revisions
C Safety Instructions
1st printing: 1986.4
4-14-1, Sotokanda, Chiyoda-ku, Tokyo 101-0021 JAPAN
Tel: + 81 3 5207 8249 Fax: +81 3 5298 5362
URL http://www.smcworld.com
Note: Specifications are subject to change without prior notice and any obligation on the part of the manufacturer.
© 2008 SMC Corporation All Rights Reserved
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