SMC Networks VEX5 Series, VEX55 Series, VEX59 Series, VEX57 Series Operation Manual

Doc. no. VEX∗∗∗∗-OMA0019-C

PRODUCT NAME

Economy Valve

MODEL / Series / Product Number

VEX5 Series

Contents

Safety Instructions --------------------------------------------------------------------------------- 2, 3

Design / Selection ---------------------------------------------------------------------------------- 4

Mounting ---------------------------------------------------------------------------------------------- 5

Piping -------------------------------------------------------------------------------------------------- 5

Wiring ------------------------------------------------------------------------------------------------- 5

Lubrication ------------------------------------------------------------------------------------------- 5

Air Supply -------------------------------------------------------------------------------------------- 5, 6

Operating environment --------------------------------------------------------------------------- 6

Maintenance ---------------------------------------------------------------------------------------- 6

Specific Product Precautions ------------------------------------------------------------------- 7 to 9

Troubleshooting ------------------------------------------------------------------------------------ 10, 11

- 1 -

No.VEX∗∗∗∗-OMA0019-C

Warning

Danger

Warning

1. The comp ati bil ity of the product is t he resp on sibi l ity of the perso n who des ig ns th e eq ui pme n t or

4. Contact SMC beforehand and take special consideration of safety measures if the product is to

Safety Instructions

These safety instructions are intended to prevent hazardous situations and/or equipment damage.
These instructions indicate the level of potential haz ar d with the labels of “Caution,” “Warning” or “ Dan ger .”
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 flu id power -- General rules relating to systems.

ISO 4413: Hydraulic fluid power -- General rules relating to sys tems.
IEC 60204-1: Safety of machinery -- Electrical equipment of machines .(Part 1: General requirements)
ISO 10218: Manipulating industrial robots -Safety.
etc.

Caution

Warning

Danger

Caution indicates a hazard with a low level of risk which, if not avoided, could result

in minor or moderate injury.

indicates a hazard with a medium level of risk which, if not avoided, could

result in death or serious injury.

indicates a hazard with a high level of risk which, if not avoided, will result

in death or serious injury.

decides its speci f i cat i ons.

Since the product specified here is used under various operating conditions, its compatibility with specific
equipment mus t be decided by the person who desig ns the equ ipment or dec ides its specificatio ns based o n
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 personne l with appropriate training should operate mac hinery and equipm ent.

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.

be used in any of t he f oll owing 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 -

No.VEX∗∗∗∗-OMA0019-C

Caution

beforehand and exchange

If anything is unclear, contact your nearest sales branch.

∗

∗

warranty.

The use of SMC products with production equipment for the manufacture of weapons of mass

security laws and regulation of the countries involved in the transaction. Prior to the

ollowed.

Caution

Measurement instruments that SMC manufactures or sells have not been qualified by type approval tests

by the metrology

Safety Instructions

1. The product is provided for use in manufacturing industries.

The product herein described is basically provide d for peaceful use in manufact uring industries.
If considering using the product in other industries, consult SMC
specifications or a contrac t if nec essar y.

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 warran ty and Disclaimer

1.The warranty period of the product is 1 year in service or 1.5 years after the product is
delivered,whichev er is first.
Also, the product may have specified durability, running distance or replacement parts. Please
consult your nearest sal es branch.

2. For any failur e or damage reported within the war r anty period whi ch is clearly our r es ponsibility,

a replacement product or necessary parts will be provided.

This limited war r anty 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 t he warranty terms and disclai m ers
noted in the specified catalog for the particular p r oducts.

2) Vacuum pads are excl uded from this 1 year warranty.

A vacuum pad is a consumabl e part, so it is warranted for a year after it is delivered.
Also, even withi n t he warranty period, the wear of a product due to t he use of the vacu um
pad or failure due to the deterioration of rubber material are not covered by the limited

Compliance Requirem e nts

2)

1.
destruction(WMD) or any other weapon is strict ly prohibited.

2. The exports of SMC products or technology from one country to another are governed by the
relevant
shipment of a SMC product to another country, assure th at all loca l rules governing that export

are known and f

SMC products are not intended for use as in st ruments for legal metrology.

relevant to the metrology (measurement) laws of each country.
Therefore, SMC products cannot be used for business or certification ordained
(measurement) laws of ea ch country.

- 3 -

No.VEX∗∗∗∗-OMA0019-C

Warning

Design / Selection

Caution

VEX5 Series

3 Port Solenoid Valves / Precautions 1

Be sure to read before handling

1. Confirm the specifications.

Products represented in this manual are designed only for
use in compressed air systems.
Do not operate at pressures, temperatures, etc., beyond the
range of specifications, as this can cause damage or malfunction.
Please contact SMC when using a flui d other t han com pres sed
air.
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 (such as the i nstallation of
a cover or the restricting of access to the product) to prevent
potential danger caused by actuator operation.

3. Intermediate stops

It is difficult for products like cylinders to make a piston stop
at the required intermediate position accurately and precisely
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.

4. Holding pressure

Since valves are subject to air leakage, they cannot be used
for applications such as holding pressure in a pressure vessel.

5. No t suitable for use as an emergency shutoff valve,

etc.

The valves presented in this catalog are not designed for safety
applications (e.g. emergency shutoff valve). If the valves are
used in such applications , additional safety measures should
be adopted.

6. Release of residual pressure

For maintenance and inspection purposes install a system for
releasing residual pressure.

7. 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.

8. Extended periods of continuous energization

 If a valve is continuously energized for an extended period of

time, heat generated by the coil assembly may result in
reduced performance and shorter service life, or have
adverse effects on peripheral equipm ent. If the tot al energizing
time per day is expected to be longer than the total
de-energizing time per day, use a valve which has DC type,
power saving type or long loading time type.
Depending on the operating condi tions, it may be possible to
use valves which are not mentioned above. Please contact us.

 When the valve is mounted onto a control panel, take

measures against radiation in order to keep the valve
temperature within the specified range.

9. Do not disassemble the product or make any

modifications, including additional machining .

Doing so may cause human injury and/or an accident.

1. Leakage voltage

Take note that the leakage voltage will increase when a resistor
is used in parallel with a switching element or when a C-R
circuit (surge voltage suppressor) is used for protecting a
switching device because of the leakage voltage passing
through the C-R circuit. The suppressor residual leakage
voltage should be as follows.

DC coil

3% or less of the rated voltage

AC coil

20% or less of the rated voltage

2. 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
protec tion o f the out put, a very sm all am ount of elect rical
current will continue to flow even during the OFF state.
This results in the valve not returning. In a situation
where the tol eranc e is exce eded, as in the above case,
take measures to install a bleede r resist or.

2) Minimum all owable 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 normal l y. P l ease cont act
SMC.

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 considerat ion the surge voltage
protection of the controller.
In the case of diodes, the residual voltage is approximately 1 V.

4. Operation in low temperature conditions

It is possible to oper ate a valve i n extreme t emperatures , as low
as 0°C. Take appropriate measures to avoid the freezing of
drainage, moisture, etc., in low temperatures.

5. Mounting orientation

Mounting orientation is not specified.

- 4 -

No.VEX∗∗∗∗-OMA0019-C

Warning

Warning

Warning

Mounting

Piping

Wiring

Lubrication

Air Supply

Caution

Caution

VEX5 Series

3 Port Solenoid Valves / Precautions 2

Be sure to read before handling

1. Operation Manual (this copy)

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
and inspection.

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
operate prope rl y, stop ope ratio n.

Check mounting conditions when air and power suppli es are
connected. Initial function and leakage tests should be performed
after installation.

5. Painting and coating

Warnings or specifications printed on 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. 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 piping or fittings
into ports, ensure that chips from
the pipe threads or sealing material
do not enter the piping.
Also, if sealant tape is used, leave
1 t hread ridge exposed at the end
of the threads.

3. Connection of piping and fittings

 For a fitting with sealant R or NPT, first, tighten it by hand,

then use a suitable wrench to tighten the hexagonal portion of
the body an additional two or three turns. For the tight ening
torque, refer to the table below.

 When using a fitting other than an SMC fitting, follow the

instructions given by the fitting manufacturer.

4. Piping to products

When connecting piping to the product, refer to the catalogue
to avoid mistakes in the position of the supply port, etc.

1. Polarity

For a solenoid valve with DC type light / surge voltage
suppressor, check the polarity when connecting.
If a mistake is made regarding the polarity, damage may
occur to the diode in the valve, the switc hing element in the
control device, power supply equipment, etc.

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 are correct after completing all
wiring.

1. The valve has been lubricated f or life by the factory and does
not require any further lubrication.

2. If a lubricant is used in the system, us e class 1 turbine oil (no
additives), IS O VG32. For details about l ubricant m anufacturers’
brands, refer to the SMC website. Additionally, please contact
SMC for details about class 2 turbine oil (with additives) ISO
VG32.
Once lubricant is utilized within the system, since the original
lubricant applied within the product during manufacturing will
be washed away, please continue to supply lubrication to the
system. Without continued lubrication, malfunctions could occur.
If turbine oil is used, refer to the Safety Data Sheet (SDS) of
the oil.

1. Type of fluids

Please consult with SMC when us ing the product inapplications
other than compressed air.

2. When there is a large amount of drainage

Compressed air containing a large amount of drainage can
cause the 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. This may cause the malfunction
of pneumatic equipment.
If the drain bowl is difficult t o check and remove, the inst allat ion

of a drain bowl with an auto drain option is recommended.
For compressed air quality, refer to the SMC Best Pneumatics
No. 6 catalog.

4. Use clean air.

Do not use compressed ai r t hat contains chemic als, s ynthetic

oils that include organic solvents, salt, c orrosive gases, etc.,

as it can cause damage or malfunction.

- 5 -

No.VEX∗∗∗∗-OMA0019-C

Warning

Warning

Air Supply

Operating Environment

Maintenance

Caution

Caution

VEX5 Series

3 Port Solenoid Valves / Precautions 3

Be sure to read before handling

1. When extremely dry air is used as the fluid, degradation
of the lubrication properties inside 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 filt er
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 the 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 an excessive amount of carbon powder is
install a mist separator on the upstream

present,

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 the SMC Best Pneumatics
No. 6 catalo g.

1. Do not use in an atmosphere containing 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 is used in an environment where there is possible
contact with oil, weld spatter, etc.,
measures.

exercise preventive

7. When the valve is mounted in a control panel or
it’s energized for a long period of
the ambient temperature is

within the specifications

time, make sure

of the valve.

1. Maintenance should be performed according to the
procedure indicated in the Operation Manual (this
copy).

If handled improperly, human injury and/or malfunction or
damage of machinery and equipment may occur.

2. Removal of equipment, and supply/exhaust of
compressed air

Before components are removed, first conf irm that measures
are in place to prevent workpieces from dropping, run-away
equipment, etc. Then, c ut off the supply air and elec tric po wer,
and exhaust all air pressure from the system usi ng the res idual
pressure release function.
When the equipment is operated after remounting or
replacement, first confirm that measures are in place to
prevent the lurching of actuators, etc. Then, confirm that the
equipment is operating normally.

3. Low-frequenc y operation

Valves should be operated at least once every 30 days to
prevent malfunction. (Use caution regarding the air supply.)

4. Manual override

When a manual override is operated, connected equipment
will be actuated.
Operate only after safety is confirmed.

1. Drain flushing

Remove drainage from the air filters regularly.

2. Lubrication

Lubrication must be continued once it has been used i n the
system.
Use class 1 turbine oil (with no additives), VG32. If other
lubricant oil is used, it may cause a malfunction. Please
contact SMC for information on the suggested class 2 turbine
oil (with additives), VG32.

- 6 -

No.VEX∗∗∗∗-OMA0019-C

How to use DIN terminal connector

Description

Part no.

DIN connector

B1B09-2A6(standard)

Light/Surge Voltage Suppressor

Varistor

Varistor

Coil

Coil

Caution

Varistor

Coil

VEX5 Series

Specific Product precautions 1

Be sure to read this before handling.

Disassembly

1) After loosening the thread (1), then if the housing (2) is pulled
in the direction of the thread (1), the connector will be
removed from the body of equipment (solenoid, etc.).

2) Pull the thread (1) out of the housing (2).

3) On the bottom part of the t erminal block (3), there’s a cut -off part
(9). If a small flat head screwdriver is inserted between the
opening in the bott om, terminal block (3) will be removed from the
housing (2). (Fig. 1)

4) Remove the cable gland (4) and plain washer (5) and rubber
seal (6).

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) The tightening torque should be within 0.5Nm +/- 15%.
Note 2) Cable (7) external: φ6 to φ8 mm.
Note 3) Crimped terminal like round-shape or Y shape cannot be

used.

Assembly

1) Passing cable gland (4), washer (5), rubber seal (6),
housing (2) in t his order through cable (7) and connect
to terminal block (3) and then set the terminal block (3)
to the ho using (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) bet ween the bottom part of terminal block
(3) and a plug attached to equipm ent, and then screw (1) in
from the top of the housing (2) to tighten it.

Note 1) The tightening torque should be within 0.5Nm +/- 20%.
Note 2) Connector orientation can be changed by 180 degrees

depending on how to assemble the housing (2) and the
terminal block (3).

DIN terminal connector

Fig. 1

AC

<Surge voltage suppressor>
Grommet（G,H）

<Light/Surge voltage suppressor>
Grommet terminal (E),Conduit terminal (T)
DIN terminal (D)

When 100 VAC or more

When 24 VAC or less

Neon bulb

DC

<Surge voltage suppressor>
Grommet（G,H）

<Light/Surge voltage suppressor>
Grommet terminal (E),Conduit terminal (T)
DIN terminal (D)

When 100 VDC or more

When 24 VDC or less

Red(+)

Diode

Black(-)

Neon bulb

Coil

Varistor

Varistor

Coil

Coil

- 7 -

No.VEX∗∗∗∗-OMA0019-C

Electric wiring

Terminal no.

1 2 DIN terminal

Terminal

Voltage

Color

100 VAC

Blue

200 VAC

Red

DC

Red (+), Black (–)

How to use the needle

Effective rotations of the needle

VEX55∗∗

VEX57∗∗

VEX59∗∗

6 turns

8 turns

How to use for the energy saving lifter

Cylinder

High speed

● ● – ● – a Low speed

● ● ● ● –

b

High speed

– ● – – ● c Low speed

– ● ● – ●

d

Stop

– – – – –

e

Caution

Ground

Sm

Sp E REG.

REG.

For lower

For upper

VEX5 Series

Specific Product precautions 2

Be sure to read this before handling.

(2)

(1)

DIN terminal and termi nal (with ligh t /s urge voltage suppr ess or) are
connected i nsid e as i n the f i gur e b el ow. Connect t o t he co r res po nd in g
power supply.

DIN terminal block Terminal block

+ -

+ -

 Applicable cable O.D.

Type T: φ4.5 to φ7 mm
Type E: φ2.3 to φ2.8 mm
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 not be used for

type “D”.)

Lead wire color (grommet)

<System configuration and operation of circuit in

which external pilot solenoid is used>

The two economy valves (herei naft er called VEX)
a tank composes a main system that drives the double acting
cylinder, and the small regulator (hereinafter c alled RE G) and pilot
valve (hereinafter called SOL) remote control the economy valve.

Upper cylinder chamber
Lower cylinder chamber

hamber
setting

hamber
setting

XE A and A○YE A and

○

Action (●ON, –OFF)

SOL

Xa Xb Xc Yb Ya Mode

Rotate the needle clockwise to close, and counterclockwise t o
open.

Upward

Downward

a： The air in the upper cylinder chamber is exhausted from the

A

port 1 (P) of VEX
the port 1 (P) of VEX

： Air flows into the lower cylinder chamber through a throttled

b

YE A and the air in the tank flows in through

○

A

XE A.

○

opening, set by a needle, from the port 2 (A) to 1 (P) of

A

XE A.

VEX

○

： The air in the tank flows into the upper c ylinder chamber at a

c

preset low pressure from the port 2 (A) of VEX

A

YE A , whi le the

○

air in the lower cylinder chamber returns t o the tank through

A

XE A.

VEX

○

： Air returns to the tank through a throttled opening from t he

d

A

port 1 (P) to 2 (A) of VEX

： The air in the lower cylinder chamber is blocked at the port 1

e

(P) of VEX

A

XE A , while the air in the upper cylinder c hamber is

○

blocked at the port 2 (A) of VEX

XE A.

○

A

YE A.

○

- 8 -

No.VEX∗∗∗∗-OMA0019-C

How to use for the energy saving lifter

Set REG.(1).

Start

O K

Set REG.(2).

O K

Measuring the time for falling

End

Measuring the time for lifting

VEX5 Series

Specific Product precautions 3

Be sure to read this before handling.

Adjustment

1) Open the inlet valve of the pilot system(Sp) and main
system(Sm).

2) Set the lifting speed of the cylinder by REG(1). The pressure
in the tank(P
Pw (the balance pressure with t he load weight) and Pu (the
pressure which lift the cylinder).

 To reduce the internal pressure of the tank, reduce the

pressure with the discharge valve(E) of the tank before
resetting with REG(1).

3) Cylinder upper chamber pressure(P
and REG(2) is the pressure which overcomes compressed
pressure(Pu + ΔP) in the lower chamber to the tank chamber
at the lower end of the stroke.

4) In order to release air f rom the device for maintenance, close
the inlet valve for the main system (Sm) to release the air in
the tank with exhaust valve (E), then discharge air in the
cylinder upper chamber from VEX
from the pilot. This prevents lurching of the cylinder.

Reduce the setting of REG.(1).

Reduce the setting of REG.(2).

) which is set by VEXA○XE A and REG(1) consi sts of

1

= Pw + Pu > Pw

P

1

) which is set by VEXA○YE A

2

> Pu + ΔP

P

2

A

YE A. Then discharge air

○

Increase the setting of REG.(1).

Fast Slow

Increase the setting of REG.(2).

Fast

Slow

Checked

- 9 -

No.VEX∗∗∗∗-OMA0019-C

Troubleshooting

Sealing failure of the driving device.

Loosening of the bolt.

(5)

(13)

(17)

(14)

(4)

(4)

(10)

(7)

(4)

(4)

Buzzing noise

Wear of the armature.

Decline in the power supply voltage.

Foreign matter is caught in the armature.

(11)

Foreign matter is caught in the seat.

(16)

AC voltage is applied to the DC pilot valve.

Insufficient supply pressure and pilot pressure

Excessive oil supply.

(12)

(2)

(3)

Pilot pressure is decreased.

(5)

Swelling of the valve seal and piston seal.

(6)

Possible causes

Incorrect voltage.

(7)

(1)

(4)

Countermeasures

(Refer to the next page)

Perform troubleshooting with higher possibility based on the failure phenomenon.

Failure phenomenon

Open coil wire.

Foreign matter is caught in the armature.

The pilot valve switches, but
the poppet valve does not, or
there is a delay in switching.

Incorrect wiring.

Operation failure

The pilot valve can not switch.

Fuse blown out, breakage of lead wire.

Incorrect contact at the cont ac t and connection.

(15)

(5)

Foreign matter is caught in the poppet.

(9)

(6)

Coil burnout.

Voltage is too high. Or incorrect coil.

(7)

Directly exposed to water.

(8)

Increase of the pilot pressure.

Foreign matter is caught in the armature.

Air leaks from the pilot exhaust.

The supply pressure fluctuates.

The pilot pressure fluctuates.

Air is consumed by the equipment on the
secondary side.
Or, air leaks from the pi pi ng on t he
secondary side.

The set pressure fluctuates
even though the equipment
on the secondary side has
not been operated.

Pressure cannot be
adjusted

The seal has swelled, and the supply
poppet valve does not switch.

Foreign matter is caught in the poppet
valve on the exhaust side.

When the power is supplied,
a loud buzzing sound is
continuously generated.

The pressure does not
increase even if the signal
pressure is increased.

Sealing failure

Wearing of the valve seal / the piston seal.

Air leaks from the poppet valve.

Air leakage at connected part.

The poppet valve is not completely switched.

- 10 -

No.VEX∗∗∗∗-OMA0019-C

o.

Countermeasures

(1)

Connect wires correctly.

(2)

Replace the part.

(3)

Replace the part or connect wires correctly.

(4)

Replace the valve (the pilot valve) with a new one.

(5)

Adjust the pressure so that pilot pressure is within the specified range during operation.

nt of the valve, use turbine oil Class 1 (with no

If there is a large amount of condensate or condensate cannot be removed completely, mount an auto
drain or install a dryer and replace the valve.

(7)

Check the voltage, and replace the pilot valve.

(8)

Protect the valve especially the coil to prevent it from being exposed to water.

If air leakage is caused by foreign matter, remove foreign matter in the piping by air blow and replace the
valve.

(10)

Repair or replace the actuators.

Stop the air and additionally tighten the bolt.Check whether there is vibration or impact which has caused the
loosening of the bolt. Install damping rubber so that the product is not affected by the vibration and impact.

port).

(13)

Adjust the voltage so that the voltage at the time of operation stays within the specification range.

(14)

Ensure proper supply pressure and pilot pressure.

(15)

Stop the air consumption. Check where the air is leaking from, and stop the air leakage.

(16)

Install a tank on the supply side to stabilize the supply pressure.

(17)

Install a tank on the pilot pressure supply side to stabilize the pilot pressure.

Ｎ

 If incorrect oil has been used for lubrication, remove the oil with air blow, and replace the valve with a new one.

If a lubricant is used in the system after the replaceme

(6)

(9)

(11)

additive) ISO VG32.



(12)

If the countermeasures above are not effective, there may be a problem with the valve. In that case, stop using the valve
immediately.

If any of the examples below are applicable, there may be an internal problem in the valve. In that case, stop using the
valve immediately.

 The voltage used was not the rated voltage.
 The oil supplied was not the specified type.
 Lubrication was stopped during operation. Or, lubrication was interrupted temporarily.
 The product was directly exposed to water.
 Strong impact was applied.
 Foreign matter such as condensate or dust has entered the product.
 Other than the cases mentioned above, any usage which falls under the precautions in this Operation Manual.

∗If the product malfunctions, please return the valve as it is.

Reduce the amount of lubricati on to the amount at which the oil does not splash from the exhaust port (P

- 11 -

No.VEX∗∗∗∗-OMA0019-C

Revision history

AE ARenewal Ny

□

A

BE ASafety Instructions Po

□

A

CE ARenewal WU

□

1st printing : January 1987

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Tel: + 81 3 5207 8249 Fax: [phone]

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URL

Note: Specifications are subject to change without prior notice and any obligation on the part of the manufacturer.
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No.VEX∗∗∗∗-OMA0019-C