Datasheet

Precautions on Design
Warning
1. Please consult with SMC in cases where the
ambient environment does not permit leak-
age or if fluid other than air is used.
2. Do not apply negative pressure. It may result
in malfunction.
3. Do not supply air pressure from ports other
than the 1 (P) port.
The valve will malfunction when air pressure is supplied from
other ports.
Piping
Warning
1. The port marked with an arrow (왕) is the 1
(P) port (IN) and one on the opposite side is
the 2 (A) port (OUT).
The port at a right angle to them is the 3 (R) port (EXH). Be
sure to confirm before connecting since erroneous connection
will cause malfunction.
Piping
Warning
2. Before piping is connected, the pipes should
be thoroughly blown through with air (flushing)
or washed to remove chips, cutting oil and oth-
er debris from inside.
Should they remain, they could cause malfunction.
3. When connecting pipes and fittings, etc., be
sure that neither chips from the pipe threads
nor sealing material get inside the valve.
When using sealant tape, leave 1.5 to 2 thread ridges
exposed at the end of the pipe/fitting.
4. When screwing a piping component into the
valve, secure the female threaded side and
apply the recommended tightening torque.
Under tightening may result in loosening or sealing failure
while over tightening may cause damage to threads and other
problems.
Selection
Warning
1. In some cases, mineral oil grease used for
internal parts and sealant may be carried to
the output side.
Please contact SMC if this causes any inconvenience in use.
Operating Environment
Warning
1. Do not use valves where there is direct contact
with, or in atmospheres of, corrosive gases,
chemicals, salt water, water or steam.
Air Supply
Warning
1. Use clean air.
Do not use compressed air which contains chemicals, syn-
thetic oils containing organic solvents, salts or corrosive gas-
es, etc., as this can cause damage or malfunction.
2. Install an air dryer or after cooler on the up-
stream side of the pressure release 3 port valve
because air containing excessive drainage
may cause malfunction.
Caution
1. Install an air filter of 5 μm or less filtration on
the inlet side.
2. Install a mist separator on the inlet side to re-
move carbon powder from the compressor or
other equipment. An excessive amount of car-
bon dust ingress via the inlet may cause the
valve to malfunction.
Refer to “SMC Air Preparation System” for further details on
compressed air quality.
Installation and Adjustment
Warning
1. Confirm the symbols “1” and “2” before the
valve is connected. The port marked “1” is
the air inlet and the port marked “2” is the
outlet.
Pressurization is only possible via the inlet port (1). Reverse
connection may cause malfunction. The port symbols and
corresponding piping types are shown in the table below.
Caution
1. The valve must be switched to each position
instantly and securely. Stopping the knob
between the extreme positions may cause
malfunction.
2. Do not remove the mounting screws from the
bonnet.
As this may cause malfunction.
Piping type
Inlet
Outlet
Exhaust
Port symbol
1
2
3
3/4
28 to 30
Connection thread
Torque
Recommended tightening torque
Unit: [N·m]
1/8
7 to 9
1/4
12 to 14
3/8
22 to 24
1/2
28 to 30
1
36 to 38
Series VHS20/30 /40/50
Series VHS2510 / 3510 /4510 / 5510 Specific Product Precautions 1
Be sure to read before handling. Refer to back cover for Safety Instructions and "Handling
Precautions for SMC Products" (M-E03-3) for 3/4/5 Port Solenoid Valve Precautions.
7