Design/Selection
2
/
3
-Port Solenoid Valves
Precautions 2
Be sure to read this before handling products.
-5-
Caution
4
. Surge voltage intrusion
Applicable series (non-polar type solenoid valves)
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 a solenoid valve in a de-energized 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).
R
R
R
R
R
R
(Anode)
+ (Cathode)
–
Countermeasure parts
Diode
−2 V
Surge voltage
24 V
0 V
−2 V
Surge voltage
24 V
0 V
−2 V
Large capacity
load: Holding
sol. 2:
Non-holding
sol. 1: Holding
Surge voltage
24 V
0 V
Output circuit
−60 V
24 V
0 V
−60 V
24 V
0 V
−60 V
24 V
0 V
Surge voltage
Surge voltage
Surge voltage
Relay
Power supply circuit breaker
Output circuit
Internal circuit
Relay
Power supply circuit breaker
Large capacity
load: Holding
sol. 2:
Non-holding
sol. 1: Holding
Internal circuit
24 VDC
Figure 1. Surge intrusion circuit example (NPN outlet example)
24 VDC
Figure 2. Surge intrusion countermeasure example (NPN outlet example)
Operation in low temperature conditions
Take appropriate measures to avoid the
freezing of
drainage, moisture, etc., in low temperatures.
6
. Mounting orientation
The mounting orientation is universal.
7
. Initial lubrication of main valve
The main valve is already applied initial lubricant
(Grease).
Caution
5.
Warning
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
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 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 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.
Mounting
Winding
direction
Sealant tape
Expose approx. 1 thread
1. Refer to the Fittings and Tubing Precautions
(pages 52 to 56) for handling One-touch fit-
tings.
2. 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.
3. 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 thread ridge exposed at
the end of the threads.
Caution
Piping