Datasheet

Recommended
Unacceptable
Fig. 2 Binding tubes with bands
Straight
portion
Mounting
pitch
A
Fig. 1 Recommended piping configuration
Wiring
Caution
1. As a rule, use electrical wire with a cross sectional
area of 0.5 to 1.25 mm
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for wiring.
Furthermore, do not allow excessive force to be
applied to the lines.
2. Use electrical circuits which do not generate
chattering in their contacts.
3. Use voltage which is within ±10% of the rated
voltage. In cases with a DC power supply where
importance is placed on responsiveness, stay within
±5% of the rated value. The voltage drop is the value
in the lead wire section connecting the coil.
4. When a surge from the solenoid affects the electrical
circuitry, install a surge voltage suppressor, etc., in
parallel with the solenoid. Or, adopt an option that
comes with the surge voltage protection circuit.
(However, a surge voltage occurs even if the surge
voltage protection circuit is used. For details, please
consult with SMC.)
Recommended Piping Conditions
1. When connecting tubes using one-touch fittings,
provide some spare tube length shown in Fig. 1,
recommended piping configuration.
Also, do not apply external force to the fittings when binding
tubes with bands, etc. (see Fig. 2.)
Tube
size
Mounting pitch
A
Unit: mm
Nylon tube Soft nylon tube Polyurethane tube
44 or more
84 or more
89 or more
112 or more
140 or more
168 or more
29 or more
39 or more
56 or more
58 or more
70 or more
82 or more
25 or more
39 or more
57 or more
52 or more
69 or more
88 or more
Straight
portion length
ø1/8"
ø6
ø1/4"
ø8
ø10
ø12
16 or more
30 or more
32 or more
40 or more
50 or more
60 or more
Mounting
Warning
5. Secure with brackets, except in the case of steel
piping and copper fittings.
6. Avoid sources of vibration, or adjust the arm from
the body to the minimum length so that resonance
will not occur.
7. Painting and coating
Warnings or specifications printed or labelled on the product
should not be erased, removed or covered up.
Piping
Warning
Caution
1. During use, deterioration of the tube or damage to
the fittings could cause tubes to come loose from
their fittings and thrash about.
To prevent uncontrolled tube movement, install protective
covers or fasten tubes securely in place.
2. For piping the tube, fix the product securely using
the mounting holes so that the product is not in the
air.
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.
Install piping so that it does not apply pulling, pressing, bending
or other forces on the valve body.
2. Avoid connecting ground lines to piping, as this may
cause electric corrosion of the system.
3. Tighten threads with the proper tightening torque.
When attaching fittings to valves, tighten with the proper
tightening torque shown below.
4. Connection of piping to products
When connecting piping to a product, refer to its operation
manual to avoid mistakes regarding the supply port, etc.
5. In applications such as vacuum and non-leak
specifications, use caution specifically against the
contamination of foreign objects or airtightness of
the fittings.
Tightening Torque for Piping
Connection thread
Rc1/8
Rc1/4
Rc3/8
Rc1/2
7 to 9
12 to 14
22 to 24
28 to 30
Proper tightening torque [N·m]
Series VX21/22/23
Specific Product Precautions 3
Be sure to read before handling.
Refer to back cover for Safety Instructions, “Handling Precautions for SMC Products”
(M-E03-3) and the Operation Manual for 2 Port Solenoid Valves for Fluid Control
Precautions. Please download it via our website, http://www.smcworld.com
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