SMC Networks VP4 Series User manual

Doc. No.VP4*50*-OMC0001-B
PRODUCT NAME
5 Port Solenoid Valve
MODEL / Series / Product Number
VP4*50/VP4*70/VVP4*0 Series

VP4*50*-OMC0001-B
Contents
Safety Instructions --------------------------------------------------------------------------- 2,3
Design / Selection ---------------------------------------------------------------------------- 4,5
Mounting ---------------------------------------------------------------------------------------- 5
Piping -------------------------------------------------------------------------------------------- 6
Wiring -------------------------------------------------------------------------------------------- 6
Lubrication -------------------------------------------------------------------------------------- 6
Air Supply --------------------------------------------------------------------------------------- 6
Operating Environment ---------------------------------------------------------------------- 7
Maintenance ------------------------------------------------------------------------------------ 7
Specific Product Precautions --------------------------------------------------------------- 8
Trouble Shooting ------------------------------------------------------------------------------- 9,10
- 1 -

VP4*50*-OMC0001-B
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.
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.
- 2 -

VP4*50*-OMC0001-B
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.
Avacuum 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 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.
ollowed.ollowed.
ollowed.
- 3 -

- 4 -
VP4*50*-OMC0001-B
Warning
Design / Selection
1. Confirm the specification
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. Intermediate stopping
For 3-position closed center type, it is difficult to make a piston
stop at the required position accurately due to the compressibility
of air. Furthermore, since valves and cylinders are not
guaranteed for zero air leakage, it may not be possible to hold a
stopped position for an extended period of time. Please contact
SMC if it is necessary to hold a stopped position for an extended
period of time.
Refer to Specific Product Precautions for VP4350 Handling
Precautions.
4. 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 3-position
exhaust center valve or single acting cylinder, take appropriate
measures to prevent the malfunction by using it with an individual
exhaust manifold.
5. Holding of pressure
Since the valves are subject to air leakage, they cannot be used
for applications such as holding pressure in a pressure vessel.
6. Not suitable for use as an emergency shut-off
valve, etc.
VP4*50, 4*70, VVP4*0 series 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.
7. Release of residual pressure
For maintenance purposes install a system for releasing residual
pressure. Especially in the case of 3-position closed center valve,
ensure that the residual pressure between the valve and the
cylinder is released.
8. Double pilot type
When using the double pilot type for the first time, actuators may
travel in an unexpected direction depending on the switching
position of the valve. Implement measures to prevent any danger
from occurring when operation the actuator.
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 and to release the heat generated by the
valve.
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.
For applications such as mounting a valve on a control panel,
incorporate measure to limit the heat radiation so that it is within
the operating temperature range.
11. Do not disassemble the product of make any
modifications, including additional machining.
It may cause human injury and/or an accident.
1. Momentary energization
If a double solenoid valve is operated with momentary energization,
it should be energized for at least 0.1 second. However,
depending on the condition of the secondary load, it should be
energized until the cylinder reaches the stroke end position,
since there is a possibility of malfunction.
2. Leakage voltage
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 CR circuit.
The suppressor residual leakage voltage should be
as follows.
DC coil 5% or less of rated voltage
AC coil 15% or less of rated voltage
3. Solenoid valve drive for AC with a 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 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.
4. 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.
VP4*
**
*50/VP4*
**
*70/VVP4*
**
*0 Series
Precautions for 5 Port Air Operated Valve 1
11
1
Be sure to read before handling.
Caution

- 5 -
VP4*50*-OMC0001-B
Warning
Design / Selection
5. Surge voltage intrusion
With non-polar type solenoid valves, at times of sudden
interruption of the loading power supply, such as emergency
shutdown, surge voltage intrusion may be generated from
loading equipment with a large capacity (power consumption),
and the solenoid valve in a deenergized state may switch over
(see Figure 1).
When installing a breaker circuit for the loading power supply,
consider using a solenoid valve with polarity (with polarity
protection diode), or install a surge absorption diode between the
loading equipment COM line and the output equipment COM line
(see Figure 2).
6. Operation in a low temperature condition
Take appropriate measures to avoid freezing of drainage,
moisture etc. in low temperature.
7. Mounting orientation
Mounting orientation is free.
Mounting
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. Tighten threads with the proper tightening torque.
When installing the products, follow the listed torque specifications.
4. If air leakage increases or equipment does not
operated properly, stop operation.
Check mounting conditions when air and power supplies are
connected. Initial function and leakage tests should be performed
after installation.
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.
VP4*
**
*50/VP4*
**
*70/VVP4*
**
*0 Series
Precautions for 5 Port Air Operated Valve 2
22
2
Be sure to read before handling.
Caution

- 6 -
VP4*50*-OMC0001-B
Warning
Piping
1. Preparation before piping
Before piping is connected, it should be thoroughly blow 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.
3. Connection of fittings
When screwing fittings into valves, tighten as follows.
Tightening Torque for Piping
Connection thread
Proper tightening torque (
((
(N･
･･
･m)
Rc1/8 3 to 5
Rc1/4 8 to12
Rc3/8 15 to 20
Rc1/2 20 to 25
Rc3/4 28 to 30
Rc1 36 to 38
Rc1 1/4 40 to 42
Rc1 1/2 48 to 50
Follow the procedure of the manufacturer when fittings other than
SMC is used.
4. Piping
Make P port piping so that supply air pressure does not become
lower than operating pressure while operating.
If throttling air flow of P port, or opening A/B ports in the
atmosphere (or opening in almost the same conditions), pressure
drop at operating can cause malfunction of the valve.
5. Closed center types
For closed center type, check the piping to prevent air leakage
from the piping between the valve and the cylinder.
Wiring
1. Polarity
No +/- polarity for this solenoid valve
2. Applied voltage
When electric power is connected to a solenoid valve, be careful
to apply the proper voltage. Improper voltage may cause
malfunction or coil damage.
3. Check the connections.
Check if the connections a re correct after completing all wiring.
4. External force applied to lead wire
If an excessive force is applied to the lead wire, this may cause
faulty wiring. Take appropriate measures so that a force of 30 N
or more is not applied to the lead wire.
Lubrication
1. This valve needs lubrication. If lubrication is not provided
or the amount of grease is insufficient, the friction resistance
will increase in inverse proportion to the decrease of factory
applied grease, and that may cause damage of valve or
malfunction
If a lubricant is used in the system, use class 1 turbine oil
(no additive), ISO VG32.
2. Please contact SMC regarding class 2 turbine oil (with
additive), ISO VG32.
Air Supply
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
catalog.
4. Use clean air
Do not use compressed air that contains chemicals, synthetic oils
including organic solvents, salt or corrosive gasses, etc., as it can
cause damage or malfunction.
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. Air quality
Install an air filter and lubricator upstream near the valve. Select
an air filter with a filtration size of 5 μm or smaller.
3. Take measures to ensure air quality, such as by
installing an aftercooler, air dryer, or water
separator.
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 separator.
4. If excessive carbon powder is seen, install a mist
separator on the upstream side of the valve.
If excessive carbon dust is generated by the compressor, it may
adhere to the inside of a valve and cause it to malfunction.
For compressed air quality, refer to SMC’s Best Pneumatics
catalog.
Caution Caution
Caution
Caution
VP4*
**
*50/VP4*
**
*70/VVP4*
**
*0 Series
Precautions for 5 Port Air Operated Valve 3
33
3
Be sure to read before handling.

- 7 -
VP4*50*-OMC0001-B
Warning
Warning
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.
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 used in an environment where there is possible contact
with 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 temperature is
within the specification of the valve.
8. Install silencer in EA/EB/Pilot EXH port to prevent dust from
entering in the dusty ambient.
1. Temperature of ambient environment
I Use the valve within the range of the ambient temperature
specification of each valve. In addition, pay attention when using
the valve in environments where the temperature changes drastically.
2. Humidity of ambient environme
●When using the valve in environments with low humidity, take
measures to prevent static.
●If the humidity rises, take measures to prevent the adhesion of
water droplets on the valve.
Maintenance
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. 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.
For 3-position closed center type, exhaust the residual pressure
between the valve and the cylinder.
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.
3. Low frequency operation
Valves should be operated at least once every 30 days to prevent
malfunction. (Use caution regarding the air supply.)
4. Manual override
When the manual override is operated, connected equipment will
be actuated. Operate after safety is confirmed.
5. If the volume of air leakage increases or the
valve does not operate normally, do not use the
valve.
Perform periodic maintenance of the valve to
confirm the operating condition, and if there is
any air leakage.
1. Drain flushing
Remove drainage from the air filters regularly.
2. Lubrication
This solenoid valve requires lubrication, 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. Please
contact SMC for suggested class 2 turbine oil (with additive), ISO
VG32.
Caution
Caution
VP4*
**
*50/VP4*
**
*70/VVP4*
**
*0 Series
Precautions for 5 Port Air Operated Valve 4
44
4
Be sure to read before handling.

- 8 -
VP4*50*-OMC0001-B
Manifold Specification
1. When using 4 or more stations on the manifold, supply pressure
from both sides of P port.
2. If several manifold valves are used at the same time, pressure
drop may occur.
VP4350 (Closed Center) Type Precautions
Precautions at intermediate stop state of actuator
1) Extreme caution should be taken when exhausting or decreasing
supply pressure to P port with an actuator in the intermediate
stop state, as the actuator may move due to the change of
holding pressure of actuator. (This valve is designed so that air
pressure ofAor B port will be exhausted by the residual pressure
exhausting circuit in the valve when there is no air pressure left
at P port in the intermediate stop state.)
2) Make sure there is no leakage from the piping and fittings. Check
for leakage using soapy water.
Note) VP4350 is a closed center valve which performs intermediate
stop of actuator by holding pressure on the actuator side.
In some cases intermediate stop cannot be performed if there
is leakage from the valve, actuators, piping or other equipment.
VP4450 (Exhaust Center) Type Precautions
Precautions at intermediate stop state of actuator
In the neutral condition, pressure of A and B sides is exhausted
from EA and EB respectively (exhaust center type). Therefore, no
air pressure is applied to both ports of the actuator in this condition
and so the actuator can easily be operated by external force.
Particular care should be taken for a vertically mounted actuator, as
it may move down due to its weight or load.
In the initial (neutral) condition, the pressure on both sides of the
actuator is 0 (atmospheric pressure), so when it changes to the
operating condition, pressure is supplied to only one side of the
actuator, so the cylinder rod may lurch.
How to Use DIN Terminal
1. Disassembly
1) The connector can be removed from the valve by loosening the
screw (1), then pulling the cover (4).
2) Pull out the screw (1), then remove the gasket (2a) or (2b).
3) On the bottom part of the terminal block (3), there is a cut-out
(indicated by arrow) (3a). If a small flat head screwdriver is
inserted into the cut-out in the bottom, the terminal block (3) can
be removed from the cover (4).
4) Remove the cable gland (5), plain washer (6) and rubber seal
(7).
2. Wiring
1) Pass cable (8) through cable gland (5), plain washer (6), and
rubber seal (7) in that order, and then insert into the cover (4).
2) As shown below, strip the outer layer of cable (8) and crimp the
crimped terminal (9) on to the ends.
Note) Wire the power leads of the cable to No.1 and 2 terminals.
(The solenoid valve does not have polarity.)
3) Remove the screw with washer (3f) from the bracket (3e). (For
Y-shape type terminal, loosen the screw.) Mount crimped
terminal (9) as shown below, and then re-tighten the screw (3f).
Note) Tighten within the tightening torque of 0.5N･m+/-15%.
Note: a) Wiring is possible with a bare lead wire. In this case,
loosen the screw with washer (3f) and place a lead wire
(3d) into the bracket, and then re-tighten the screw.
b) Maximum size of crimped terminal (9) is up to
1.25mm
2
-3.5 for O type terminal, and up to 1.25mm
2
-4
for Y type terminal.
c) For cable (8), use cables with external diameters of φ6 to
φ12mm
Note) For cables with external diameters between φ9 to
φ12mm, remove the inside parts of the rubber seal (7)
before using.
3. Assembly
1) Re-insert terminal block (3) into cover (4).
(Push it down until you hear a click sound.)
2) Ensure rubber seal (7) and plain washer (6) are on the cable in
this order and insert them into the entry in the cover (4), then
tighten the cable gland (5) securely.
3) Insert gasket (2a) or (2b) between the bottom part of the
terminal block (3) and the plug on the equipment, screw in
screw (1) from the top of the cover (4) and tighten it.
Note 1) Tighten within the tightening torque of 0.5N･m+/-20%.
Note 2) The orientation of the connector can be changed by
90
o
increments, by attaching the cover (4) in the
desired direction to the terminal block (3).
DlN Terminal (Connection)
The solenoid is wired with male terminals of DIN connector as
shown below. Connect with corresponding terminals of the
connector.
Can be used as either “+ COM” or “– COM”.
Caution
Caution
Be sure to read
this
before handling.
VP4*
**
*50/VP4*
**
*70/VVP4*
**
*0 Series
Specific Product Precautions 1
Closeup
Self-up screw

- 9 -
VP4∗50∗-OMC0001-B
Trouble shooting
Remedy
（Next page）
sound is emitted when the
power is turned on
Foreign matter caught in core of
solenoid valve
(such as cylinder) side
Air leaks through EXH.
Port (PE port) of pilot valve
A continuous loud buzzing
Foreign matter caught in the valve
sliding part
Air leaks through EXH.
Port (EA,EB port) of main valve.
Pilot valve operates, but
main valve does not
operate or is slow to
operate
Check the cause of the failure starting from the cause which seems most likely, and implement
countermeasures.
Intrusion of foreign matter
Air leaks throuth gasket.
⑫
Insufficient bolt tightening
⑤
⑥
⑦
Swollen spool seal
⑥
Inefficient lubrication
⑧
Burnt coil
Voltage outside of the allowable range
⑤
Failure Cause
Operation failure
Faulty wiringPilot valve does not operate.
Disconnection of coil
①
Blown fuse or disconnection of lead wire
②
Contact failure of contact and connection ③
④
Foreign matter caught in armature
Low pilot pressure
⑨
or incorrect coil
Buzzing failure
Coil splashed by water, etc.
⑩
Seal failure Worn spool seal
⑦
Spool valve has not fully operated.
Decline of power source voltage
⑭
⑪
Foreign matter caught in seat
⑬
Worn spool seal
Seal failure at actuator

- 10 -
VP4∗50∗-OMC0001-B
Remedy
No. Remedy
①Connect the wires again correctly.
②Replace the part.
③Replace the part or connect wires securely.
④Replace pilot valve assembly.
⑤
Adjust pressure so that pilot pressure is within operating pressure range during opretation.
- If the lubrication oil was incorrect, remove the oil by air blow and replace the valve.
Lubricate with turbine oil class 1 (ISO VG32) after replacing the valve.
⑨Check voltage. Replace pilot valve assembly.
⑪Fix or replace the actuator.
⑫Isolate the valve and re-tighten the bolts.
⑬Replace pilot valve assembly.
⑭Regulate voltage so that the voltage when operating is within the specified range.
1. Valve has been lubricated with a type of oil other than the specified type.
2. Lubrication has been stopped, or temporarily suspended.
3. The product has been directly exposed to water.
4. The product has been subjected to strong impact.
5. Foreign matter such as moisture or particles have entered the valve.
∗
Please return the failed valve to SMC in the exact state when the failure occurred.
- When a large amount of moisture is generated and cannot be removed, install either
an auto-drain or a dryer, and replace the valve.
⑥
To remove foreign matter, clean the pipe by air blow. Replace valve.
⑦
If lubricating oil has not been supplied, supply it. If a lubricator is installed, check it for
oil level and whether it is dropping oil properly.
⑧
If no improvement is achieved even when these countermeasures are implemented, the inside of the
valve may be damaged. In this case, stop using the valve immediately.
If any of the following actions have been carried out, the inside of the valve may be damaged. In this
case, stop using the valve immediately.
Protect the valve so that water does not splash the coil. Replace valve.
Replace pilot valve assembly.
⑩
6. The valve has been used in a way prohibited in the ''Precautions'' section in this operation manual.

VP4*50*-OMC0001-B
Revision history
□
A Renewal PX
□
B Renewal Uy
1st printing: CV
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.
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