SMC Networks VXS23 Manual

VXSS-TFR48
Installation and Maintenance Manual
VXS Zero Pressure Differential Type
Pilot operated 2 port solenoid valve
For Steam and Heated water
1 Safety Instructions
This manual contains essential information for the protection of users and
others from possible injury and/or equipment damage.
•Read this manual before using the product, to ensure correct handling,
and read the manuals of related apparatus before use.
•Keep this manual in a safe place for future reference.
•These instructions indicate the level of potential hazard by label of
“Caution”, “Warning” or “Danger”, followed by important safety
information which must be carefully followed.
•To ensure safety of personnel and equipment the safety instructions in
this manual and the product catalogue must be observed, along with
other relevant safety practices.
Caution
Indicates a hazard with a low level of risk, which if not
avoided, could result in minor or moderate injury.
Warning
Indicates a hazard with a medium level of risk, which
if not avoided, could 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.
Warning
•The compatibility of equipment is the responsibility of the person
who designs the system or decides its specifications.
Since the products specified here can be used in various operating
conditions, their compatibility with a specific system must be based on
specifications or after analysis and/or tests to meet specific
requirements.
•Only trained personnel should operate pneumatically operated
machinery and equipment.
The fluid can be dangerous if an operator is unfamiliar with it. Assembly,
handling or repair of the system should be performed by trained and
experienced personnel.
•Do not service machinery/equipment or attempt to remove
components until safety is confirmed.
1) Inspection and maintenance of machinery/equipment should only be
performed after confirmation of safe locked-out control positions.
Measures to prevent danger from the fluid should also be taken.
2) When equipment is to be removed, confirm the safety processes as
mentioned above. Release the fluid pressure and be certain there is no
danger from fluid leakage or fluid remaining in the system. Switch off
electrical supplies.
3) Before machinery/equipment is re-started, ensure all safety measures
are being implemented.
•Do not use this product outside of the specifications. Contact SMC
if it is to be used in any of the following conditions:
1) Conditions and environments beyond the given specifications, or if the
product is to be used outdoors.
2) Installations in conjunction with atomic energy, railway, air navigation,
vehicles, medical equipment, food and beverage, recreation equipment,
emergency stop circuits, press applications, or safety equipment.
3) An application which has the possibility of having negative effects on
people, property, or animals, requiring special safety analysis.
Caution
•Ensure that the air supply system is filtered to 5 m.
2 Specifications
2.1 General Specifications
Valve
specifications
Valve construction
Zero differential pressure pilot operated 2
port piston type
Withstand pressure (with
water)
2.0 MPa
Maximum system pressure
1.0 MPa
Maximum operating
pressure differential
1.0 MPa
Minimum operating
pressure differential
0 MPaNote 1)
Body material
Brass (C37), Stainless steel
Seal material (Note 3)
FKM
Enclosure
Dust-tight, Water jet-proof type (IP65)
Environment
Location without corrosive or explosive
gases
Coil
specifications
Rated voltage
AC
100 VAC, 200VAC, 110VAC, 230VAC,
(220VAC, 240VAC, 48VAC, 24VAC)Note 2)
DC
24 VDC
Allowable voltage fluctuation
±10% of rated voltage
Allowable leakage
voltage
AC
5% or less of rated voltage
DC
2% or less of rated voltage
Coil insulation type
Class H
Note 1) The operation of the valve may be unstable due to the capacity of the
pressure supply source such as pumps and compressors or the pressure loss by the
orifice of piping. Please contact SMC to check if the required valve size can be used
in the application. Contact SMC for the compatibility of the circuit and valve size.
Note 2) Voltage in brackets ( ) indicates special voltage.
2.2 Coil Specifications
2.2.1 Normally Closed (N.C.)
DC Specification
Model
Power consumption (W)Note1)
Temperature rise (°C)Note2)
VXS23/24
12
100
VXS25/26
15
100
Note 1: Power consumption: The value at ambient temperature of 20°C and when the
rated voltage is applied. (Variation: ±10%).
Note 2: The value at ambient temperature of 20°C and when the rated voltage is
applied. The value depends on the ambient environment. This is for reference.
2.2.2 Normally Closed (N.C.)
AC Specification (Built-in Full-wave Rectifier Type)
Model
Apparent power (VA)Note 1, 2)
Temperature rise (°C)Note 3)
VXS23/24
12
100
VXS25/26
15
100
Note 1: Power consumption, apparent power: The value at ambient temperature of
20°C and when the rated voltage is applied. (Variation: ±10%)
Note 2: There is no difference in the frequency and the inrush and energized apparent
power, since a rectifying circuit is used for AC. (Built-in full-wave rectifier type).
Note 3: The value at ambient temperature of 20°C and when the rated voltage is
applied. The value depends on the ambient environment. This is for reference.
2.3 Model/Valve specifications
For STEAM / Single Unit (Can be used with heated water)
Normally closed (N.C.)
C37, Stainless steel body
Size
Port
Size
Orifice
Dia.
(mm)
Model
Flow characteristics
WeightNote)
(g)
Av
(x 10-6 m2)
Cv
3
1/4
10
VXS235
58
2.4
600
3/8
67
2.8
4
1/2
15
VXS245
130
5.3
720
5
3/4
20
VXS255
220
9.2
1100
6
1
25
VXS265
290
12.0
1300
Note) Weight of Grommet type. Add 10g for Conduit type, 30g for DIN terminal, 60g
for Conduit terminal type.
Ambient and fluid temperature
Fluid
Temperature (°C)
Ambient temperature (°C)
Steam
183 or less
-20 to 60
Heated water
99 or less
Note) With no freezing.
2 Specifications (continued)
Valve Internal Leakage Rate
Fluid
Seal Material
Leakage rateNote)
Steam
FKM
1 cm3/min or less
Heated water
0.1 cm3/min or less
Valve External Leakage Rate
Fluid
Seal Material
Leakage rateNote)
Steam
FKM
1 cm3/min or less
Heated water
0.1 cm3/min or less
Note) Leakage is the value at ambient temperature 20°C.
2.4 Pneumatic Symbol
2.4.1 Valve
Valve
Symbol
Normally closed (N.C.)
Table 1
3 Installation
Warning
•Do not install the product unless the safety instructions have been read
and understood.
3.1 VXS Valve Mounting Bracket
C37, Stainless steel (Bracket optional)
Figure 1
Model
Port
size
P
A
(mm)
Bracket Mounting
(mm)
a
b
f
i
j
H
J
VXS23
1/4, 3/8
10.5
56
75
30
31
37
35
10
VXS24
1/2
14
56
75
34
35
41
35
14
VXS25
3/4
17
70.5
92
39
43
46
33
15.2
VXS26
1
20
70.5
92
41
45
48
37
17.2
Table 2
3 Installation (continued)
3.2 Environment
Warning
•Do not use in an environment where corrosive gases, chemicals, salt
water, water, water vapour are present or where there is direct contact
with any of these.
•Do not use in an explosive atmosphere.
•Do not expose to direct sunlight. Use a suitable protective cover.
•Do not install in a location subject to vibration or impact. Check the
product specifications.
•Do not mount in a location exposed to radiant heat.
•Employ suitable protective measures in locations where there is contact
with water droplets, oil or welding splatter, etc.
3.3 Piping
Caution
•Before connecting piping, it should be thoroughly blown out with air
(flushed) or washed to remove chips, cutting oil and other debris from
inside the pipe.
•Avoid connecting ground lines to piping, as this may cause electrolytic
corrosion of the system.
•When installing piping or fittings, ensure sealant material does not enter
inside the port. When using seal tape, leave 1.5 to 2 threads exposed on
the end of the pipe/fitting.
•Tighten fittings to the specified tightening torque, see Table 3.
•Install piping so that it does not apply pulling, pressing, bending or other
forces on the valve body.
•When connecting piping, avoid mistakes regarding the supply port.
•Steam generated by a boiler contains a large amount of drainage;
ensure to operate with a drain trap installed.
•Avoid installing piping to the valve at the lowest point of the layout. If
condensate accumulates in the valve or adjacent piping, this could
cause steam hammer. If steam hammer causes a problem, install a
bypass to discharge condensate from the piping.
•If the effective area of the piping on the fluid supply side is restricted, the
operating time may become unstable due to the differential pressure
fluctuation when the valve is closed.
Thread
Tightening Torque N•m
Rc 1/4
12 to 14
Rc 3/8
22 to 24
Rc 1/2
28 to 30
Rc 3/4
28 to 30
Rc 1
36 to 38
Table 3
3 Installation (continued)
3.3.1 Valve Ports
C37, Stainless steel
Figure 2

VXSS-TFR48
3 Installation (continued)
Model
Port size P
(Rc)
Valve Ports
(mm)
A
B
B1
C
VXS23
1/4, 3/8
21
57
28.5
10.5
VXS24
1/2
28
70
37.5
14
VXS25
3/4
33.5
71
38.5
17
VXS26
1
42
95
49.5
20
Table 4
3.4 Electrical connection
Caution
•Avoid mis-wiring, as this can cause malfunction, damage and fire to the
product.
•To prevent noise and surge in signal lines, keep all wiring separate from
power lines and high voltage lines. Otherwise this can cause
malfunction.
•When a surge from the solenoid affects the electrical circuitry, install a
surge absorber, etc., in parallel with the solenoid. Or, use an option that
comes with surge voltage protection circuit.
•Use electrical circuits that do not generate chattering in their contacts.
•Use voltage that is within ±10% of the rated voltage. In cases with a DC
power supply where responsiveness is important, stay within ±5% of the
rated value. (The voltage drop is the value in the lead wire section
connecting the coil).
•Generally use electrical wire with cross sectional area 0.5 to 1.25 mm2.
•Do not bend or pull cables repeatedly.
•Do not allow excessive force to be applied to the lines.
•Do not apply AC voltage to AC type unless it has a built in full-wave
rectifier or it will be damaged.
3.4.1 Grommet
Figure 3
Rated Voltage
Lead wire colour
1
2
DC
Black
Red
100 VAC
Blue
Blue
200 VAC
Red
Red
Other AC
Grey
Grey
*There is no polarity
Table 5
3.4.2 DIN Terminal
Figure 4
Terminal no.
1
2
Din Terminal
+(-)
-(+)
*There is no polarity
Table 6
•Use a heavy-duty cord with an outside cable diameter of Ø6 to 12 mm.
•Tighten screws and fittings according to Figure 5.
3 Installation (continued)
Figure 5
Caution
•For class H coil, surge voltage suppressor and full-wave rectifier (for AC)
are on DIN connector side. A SMC DIN connector must be used. Part
numbers can be found in product catalogue.
3.4.3 Conduit Terminal
•Make connections according to the marking shown in Figure 6.
•Tighten screws and fittings according to Figure 6.
•Properly seal the terminal connection (G1/2) with special wiring conduit,
etc.
Figure 6
3 Installation (continued)
3.4.4 Conduit
•When used as an IP65 equivalent use seal (VCW20-15-6) to install the
wiring conduit.
•Tighten conduit to torque shown in Figure 7.
Figure 7
Rated Voltage
Lead wire colour
1
2
DC
Black
Red
100 VAC
Blue
Blue
200 VAC
Red
Red
Other AC
Grey
Grey
*There is no polarity
(For the power saving type, there is polarity)
Table 7
3.5 Electrical circuits
3.5.1 DC circuit
Figure 8
3.5.2 AC circuit
Figure 9
3 Installation (continued)
3.6 Mounting
•Secure with brackets, except in the case of steel piping and copper
fittings.
•Avoid sources of vibration, or adjust the distance from the body to a
minimum length so that resonance will not occur.
•If air leakage increases or equipment does not operate properly, stop
operation. After mounting is completed, confirm that it has been done
correctly by performing a suitable function test.
•Do not apply external force to the coil section:
When tightening fittings, apply a wrench or other tool to the outside of
the piping connection parts.
•Do not install with the coil downwards.
If a valve is mounted with the coil positioned downwards, foreign objects
in the fluid will adhere to the iron core leading to a malfunction.
•Do not warm the coil assembly with a heat insulator, etc.
Use tape, heaters, etc., for freeze prevention on the piping and body
only. They can cause the coil to burn out.
•Painting and coating:
Warnings or specifications printed or labeled on the product should not
be erased, removed or covered up.
3.7 Lubrication
Caution
•SMC products have been lubricated for life at manufacture, and do not
require lubrication in service.
•If a lubricant is used in the system, use turbine oil Class 1 (no additive),
ISO VG32.
•Once lubricant is used in the system, lubrication must be continued
because the original lubricant applied during manufacturing will be
washed away.
4 How to Order
Refer to the catalogue for this product.
5 Outline Dimensions (mm)
Refer to the catalogue for this product.
6 Maintenance
6.1 General Maintenance
Caution
•Not following proper maintenance procedures could cause the product to
malfunction and lead to equipment damage.
•If handled improperly, compressed air can be dangerous. Maintenance
of pneumatic systems should be performed only by qualified personnel.
•Before performing maintenance, turn off the power supply and be sure to
cut off the supply pressure. Confirm that the air is released to
atmosphere.
•After installation and maintenance, apply operating pressure and power
to the equipment and perform appropriate functional and leakage tests
to make sure the equipment is installed correctly.
•Do not make any modification to the product.
•Do not disassemble the product, unless required by installation or
maintenance instructions.
•Exhaust the drainage from the piping periodically.
Warning
6.2 Removing the product:
•The valve will reach a high temperature when used with high
temperature fluids. Confirm that the valve temperature has dropped
sufficiently before performing work. If touched inadvertently, there is
danger of being burned.
1. Shut off the fluid supply and release the fluid pressure in the
system.
2. Shut off the power supply.
3. Remove the valve, ensuring any seals are retained.

VXSS-TFR48
6 Maintenance (continued)
6.3 Low frequency operation:
•Switch valves at least once every 30 days to prevent malfunction. Also,
in order to use it under the optimum state, conduct a regular inspection
once every 6 months.
Caution
6.4 Filters and strainers:
•Be careful regarding clogging of filters and strainers.
•Replace filter elements after one year of use, or earlier if the pressure
drop reaches 0.1 MPa.
•Clean strainers when the pressure drop reaches 0.1MPa.
6.5 Lubrication:
•When using after lubricating, never forget to lubricate continuously.
6.6 Storage:
•In case of long term storage after use with heated water, thoroughly
remove all moisture to prevent rust and deterioration of rubber materials,
etc.
7 Limitations of Use
Warning
•Do not exceed any of the specifications laid out in section 2 of this
document or the specific product catalogue.
7.1 Confirm the specifications:
•Give careful consideration to the operating conditions such as the
application, fluid and environment and use within the operating ranges
specified.
7.2 Fluid:
•Type of fluid;
Before using a fluid, confirm whether it is compatible with the materials
for each model by referring to the fluids listed in the catalogue.
•Corrosive gas;
Cannot be used since it will cause cracks by stress corrosion or result in
other incidents.
•When a brass body is used, then depending on water quality, corrosion
and internal leakage may occur. If such abnormalities occur, exchange
the product for stainless steel body.
•Use an oil-free specification when any oily particles must not enter the
system.
•Applicable fluid in the catalogue list may not be suitable depending on
the operating conditions. Give adequate consideration and then
determine a suitable model, as the compatibility list is for general case.
7.3 Fluid quality: Steam, Water
•The use of a fluid that contains foreign matter can cause problems such
as malfunction and seal failure by promoting wear of the valve seat and
armature, and by sticking to the sliding parts of the armature, etc.
•Install a suitable filter (strainer) immediately upstream from the valve. As
a general rule, use 80 to 100 mesh.
•However, the size and shape of foreign objects that occur depends on
the operating environment. Check the fluid state and choose an
appropriate mesh size.
•The supply water to a boiler includes materials that create a hard
sediment or sludge such as calcium and magnesium. Sediment and
sludge from steam can cause the valve not to operate properly. Install a
water softening device which removes these materials.
•Do not use steam which contains chemicals, synthetic oils containing
organic solvents, salts or corrosive gases etc., as these can cause
damage or deterioration.
•As the special FKM used in this product has higher alkali resistance than
general FKM, it can be used with steam containing boiler compounds.
However, the resistance to other chemicals such as organic solvents is
the same as general FKM. Please confirm resistance to the components
of the boiler compound before use.
7 Limitations of Use (continued)
7.4 Leakage voltage:
When connecting C-R element parallel to switching element, leakage
current flows through C-R element and the leakage voltage increases.
Figure 10
Ensure that the voltage leakage across the coil is as follows:
AC coil: 5% or less of rated voltage.
DC coil: 2% or less of rated voltage.
7.5 Low temperature operation:
•The valve can be used in an ambient temperature of between -10 to
-20°C. However, take measures to prevent the water from freezing or
solidification of impurities, etc.
•When using valves for water application in cold environments, take
appropriate countermeasures to prevent water freezing in the system,
after the water supply from the pump is cut off, by draining the water,
etc.
•When warming by a heater, etc, be careful not to expose the coil
assembly to the heater.
•For air, installation of a drier and heat retaining of the body is
recommended to prevent a freezing condition in which the dew point
temperature is higher than the ambient temperature.
7.6 Cannot be used as an emergency shut-off valve etc.
•This product is not designed for safety applications such as an
emergency shut-off valve. If the valves are used in this type of system,
other reliable safety assurance measures should also be adopted.
7.7 Extended periods of continuous energization
•The solenoid coil will generate heat when continuously energized, so
avoid installing in an enclosed space. Install in a well-ventilated area.
•Do not touch the coil while it is being energized or immediately after
energization.
•Be especially careful when using three or more adjacent valves with
manifolds and keeping them continuously energized for extended
periods, as this may result in dramatic increases in temperature.
7.8 Liquid circuits
•In cases with flowing liquid, provide a bypass valve in the system to
prevent the formation of a sealed circuit.
7.9 Steam hammer
•When problems are caused by steam hammer, install steam hammer
relief equipment (accumulator, etc.).
7.10 Back pressure
•If there is a possibility of back pressure being applied to the valve, take
countermeasures such as mounting a check valve on the downstream
side of the valve.
7.11 Pressure holding
•Not suitable for an application such as holding pressure inside a
pressure vessel, because the valve has some leakage.
7.12 Usage with low flow
•Unstable flow may occur under the following conditions;
Low flow from the pump or boiler, etc.
Use of several elbows or tees in the circuit.
Thin nozzles installed at the end of piping, etc.
7 Limitations of Use (continued)
These can cause valve opening/closing failure or oscillation and cause a
valve malfunction.
•Check the pressure differential and flow to select the appropriate size of
valve by referring to the flow rate characteristics. Ensure the pressure
differential does not become less than 0.01MPa during ON (N.C.: Valve
Open).
7.13 Rapid pressure changes
•If used in conditions in which rapid decrease in the inlet pressure and
rapid increase in the outlet pressure of the valve are repeated, excessive
stress will be applied to the piston, which causes damage to the piston,
leading to malfunction of the valve.
Check the operating conditions before use.
7.14 Sudden inlet pressure increase
•When valve is closed and pressure is applied suddenly due to starting of
fluid supply source, such as boiler, the valve may open momentarily and
fluid may leak.
8 Contacts
AUSTRIA
(43) 2262 62280-0
LATVIA
(371) 781 77 00
BELGIUM
(32) 3 355 1464
LITHUANIA
(370) 5 264 8126
BULGARIA
(359) 2 974 4492
NETHERLANDS
(31) 20 531 8888
CZECH REP.
(420) 541 424 611
NORWAY
(47) 67 12 90 20
DENMARK
(45) 7025 2900
POLAND
(48) 22 211 9600
ESTONIA
[phone]
PORTUGAL
(351) 21 471 1880
FINLAND
(358) 207 513513
ROMANIA
(40) 21 320 5111
FRANCE
(33) 1 6476 1000
SLOVAKIA
(421) 2 444 56725
GERMANY
(49) 6103 4020
SLOVENIA
(386) 73 885 412
GREECE
(30) 210 271 7265
SPAIN
(34) 945 184 100
HUNGARY
(36) 23 511 390
SWEDEN
(46) 8 603 1200
IRELAND
(353) 1 403 9000
SWITZERLAND
(41) 52 396 3131
ITALY
(39) 02 92711
UNITED KINGDOM
(44) 1908 563888
URL :
http// www.smcworld.com (Global) http// www.smceu.com (Europe)
Specifications are subject to change without prior notice from the manufacturer.
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