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VP-SMY116EN
2 Specifications - continued
2.11.3 Relationship of flow and response performance to safety
function
• The safety function is to vent the compressed air in the protected
system so that the protected system does not present a hazard when
the application operates under the control of a suitable safety system.
• The time taken for the air to vent and remove the hazard is a function
of:
• The flow capacity of the valve
• The flow restriction of silencers fitted to the valve
• The volume of the protected system
• The pressure of the air in the protected system
• The flow restrictions in the protected system
• The end user is expected to establish the time taken to vent the
application system and ensure that this time is consistent with the
requirement of the overall safety system. This includes the selection of
suitable silencers.
• The performance of the system should be validated by test after each
installation to ensure that the actual performance of the valve is
consistent with the safety function. Validate the performance of the
system under all foreseeable operating conditions of pressure, flow
and volume.
2.11.4 Mission time according to the Safety Standard
The operational life of the product shall be limited to the mission time
stated in section 2.2. The user is expected to calculate an equivalent
figure in time units from the B
value based on the operating cycles of
10D
the application. In no circumstances can the mission time exceed 20
years. After the mission time has expired for the component it shall be
replaced with a new unit.
2.11.5 MTTF
according to the Safety Standard
D
The B
for the component given in section 2.2 is derived from product
10D
knowledge and based on specific life tests. The system integrator should
use this data to determine MTTF
and the Performance Level (PL) of the
D
system using the methods described in the Safety Standard.
2.11.6 Diagnostic Coverage according to the Safety Standard
These valves are fitted with 'direct monitoring' according to Table E1 of
EN ISO 13849-1. When properly integrated these valve assemblies can
contribute to a DC value of 99% to the DCavg for the complete safety
function.
2.11.7 Common Cause Failures according to the Safety Standard
CCF analysis is the responsibility of the system integrator.
The single valve is a single channel system so CCF does not apply.
The duplex valve has 2 channels made of identical valves. The use of
this valve might not allow the system calculation to include CCF points
for diversity.
3 Installation
3.1 Installation
Warning
• Do not install the product unless the safety instructions have been read
and understood.
• Do not install the product if it appears to have been damaged during
transport.
• The valve must be protected from contamination from the downstream
system when air is vented through the valve.
• Do not paint the product.
• Do not remove or cover up warnings or specifications printed or affixed
to the product.
• Ensure sufficient space for maintenance activities. When installing the
products, allow access for maintenance.
• Ensure that the connections of pipework and cables to the unit do not
result in a residual trip hazard to system operators or maintainers.
• If air leakage increases or equipment does not operate to specification,
stop operation.
• Check mounting conditions when air and power supplies are
connected. Initial function and leakage tests should be performed after
installation.
3.2 Environment
Warning
• Do not use in an environment where corrosive gases, chemicals, salt
water or steam are present.
• Do not use in an explosive atmosphere.
• Do not expose to direct sunlight. Use a suitable protective cover.
3 Installation - continued
• Do not install in a location subject to vibration or impact in excess of
the product's specifications.
• Do not mount in a location exposed to radiant heat that would result in
temperatures in excess of the product's specifications.
• Do not install in a location subject to strong magnetic fields.
• Do not install in an EMC environment other than 'industrial' according
to the scope of standard listed on the Declaration of Conformity.
• If it is used in an environment where there is possible contact with oil,
weld spatter, etc., exercise preventive measures.
• When the solenoid valve is mounted in a control panel or is energised
for a long time, make sure ambient temperature is within the
specification of the valve.
• Ambient humidity
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.
Do not use in high humidity environment where condensation occurs.
• Altitude limitation is 1000 m above sea level.
3.3 Piping
Caution
• Before connecting piping make sure to clean up chips, cutting oil, dust
etc.
• When installing piping or fittings, ensure sealant material does not
enter inside the port. When using seal tape, leave 1 thread exposed
on the end of the pipe/fitting.
Figure 14.
• Tighten fittings to the specified tightening torque.
Port
Connection Thread
Tightening
size (R, NPT)
Torque [N·m]
X (External pilot)
1/8 (Rc, G, NPT)
3 to 5
3(R) for VP500 / VP700
3/8 (G)
15 to 20
Table 9.
3.4 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.
3.5 Air supply
Warning
• Type of fluids
Please consult with SMC when using the product in applications other
than compressed air.
• When there is a large amount of condensate.
Compressed air containing a large amount of water vapour can cause
malfunction of pneumatic equipment such as valves. An air dryer or
water separator should be installed upstream from filters.
• 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.
• Type of 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.
Caution
3 Installation - continued
• The air supply to the valve must be large enough to operate the valve
and to deal with possible transient pressures. The supply connection
should be a minimum of 3/8" for VP546 and ½" for VP746.
• 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.
• Install an air filter upstream near the valve. Select an air filter with a
filtration size of 5 μm or smaller.
• Take measures to ensure air quality, such as by installing an
aftercooler, air dryer, or water separator.
• 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.
• When using the external pilot type valve, it is recommended that the
main supply pressure and the pilot pressure are taken from separate
lines.
Warning
• Ensure there is no hazard created by any air trapped between the
check valve and the pilot valves.
• Minimise the distance between the valve and the air supply and
between the valve and the protected system. Do not place any devices
between the valve and the protected system that might interfere with
the safety function. The exhaust ports of the valve should not be left
unconnected.
• The exhaust ports of the valves should never be blocked and must be
protected from ingress of contamination by a suitable silencer or device
which does not affect the valve function.
3.6 Mounting
Caution
• The valves are compatible with the modular FRL unit AC-D series,
please observe the AC-D precautions for mounting orientation.
• The valves require the use of Y#00T-
Page 3 of 4
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