Series VEF-VEP Electro-pneumatic Proportional Val

2
Series
VEF/VEP
Application Example
How to Use DIN Terminal
Controlling pressure
for die press cushion
Controlling multispeed of cylinder
Surge absorber
Power
amplifier
Electro-pneumatic
proportional valve
(Pressure control vlave)
Power
amplifier
Control
circuit
Control
circuit
Electro-pneumatic proportional valve
Flow type (3 port)
Regulator valve (VEX1)
Die cushion
(Imagine air type shock absorber)
Power
amplifier
1. Loosen the retaining screw and pull the
connector from the pin plug.
2. Make sure to remove the retaining screw,
insert the tip of a flat head screwdriver into
the groove below the terminal block and pry it
up to separate the terminal cover from the
terminal block.
3. Securely connect the wires to the specified
terminals in accordance with the wiring
procedure.
Wiring
Terminal block
Connection 3 is not used
for terminal 1 and 2.
∗ Coil has no polarity.
Controlling rotation of air motor
Controlling welding pressure
of welding machine electrode
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com
Electro-pneumatic
proportional valve
(Pressure control valve)
Caution
Wiring procedure
Control circuit
Number of
rotations
Feedback
Regulator valve
(VEX1)
Power amplifier
(Feedback circuit
built-in type)
Control
circuit
0.75 mm2, 1.25 mm2/2 core, 3 core (O.D. ø6.8 to
ø11.5) based on JIS C 3312 and C 3322
Tachometer
Pressurizing
cylinder
Air motor
Electrode
Check valve
Pin plug shape
Applicable cable (Heavy-duty cable)
Outlet changing procedure
Electro-pneumatic
proportional valve
(Flow type, 2 port)
To change the wire outlet, first separate the
terminal cover from the terminal block.
Then, reinstall the terminal cover in the desired
direction (in 90° increments).
Precautions
Controlling pressure
of low pressure die-casting
Be sure to read before handling.
Refer to pages 14-21-3 to 14-21-4
for Safety Instructions and
Common Precautions.
Power amplifier
with feedback circuit
Control circuit
Pressure sensor
Electro-pneumatic proportional valve
VEXP3141
Caution
1. Air supply
Cooler
Low pressure
die-casting
Poor quality air could increase the spool’s
sliding resistance, while preventing it from
attaining its specified characteristics. Use
compressor oil with a minimal generation of
oxidants and install a mist separator (SMC’s
AM series). Refer to page 14-14-2.
Regulator valve VEX1
Release valve
2. Mounting
Vibrations are transmitted to the valve by
the proportional solenoid’s dither. If it is
necessary to prevent the transmission of
vibrations, insert vibration isolating rubber
material.
Thoroughly flush the pipe to completely
eliminate any dust or scales from the pipe
inside.
Install a silencer (AN series) on the
exhaust port.
Be careful with the molded coil because it
generates heat while current is applied to
it.
3. Lubrication
Previous Type VE PF 0, VEA1
Caution
P
VEE0
must be used in conjunction with the
power amplifier VEA1.
An old VEA1 cannot be used in
P
combination with the current VE E1.
14-9-12
This product can be used without lubrication.
But if lubricated, use turbin oil Class 1, ISO
VG32 (with no additive). It is impossible to
use spindle oil, machine oil, or grease.
4. Manual operation
To check the operation of the valve without
applying a current, remove the lock nut and
use a screwdriver or the like to press the tip
of the core. After checking the operation,
reinstall the rubber cap in its original position.
3
Electro-pneumatic Proportional Valve
Diagram of Working Principle
Series
VEF/VEP
Flow Characteristics: 3 Port
The spool controls the sleeve’s opening through
the balance between the proportional solenoid’s
pulling force (F1) and the spring’s reaction force
(F2). The spool moves in accordance with the
amperage that is applied to the proportional
solenoid, thus controlling the flow rate.
Fully open
co
ntr
ol
F.R.L.
3 port
AV
Effective area (mm2)
R
A
Fully open
AU
AF
AR
IR
VEX
AMR
ITV
IC
Current A
Current A
VBA
F2 spring
VE
Flow Characteristics: 2 Port
VY1
Controlled opening
G
PPA
Spool
Sleeve
AL
Effective area (mm2)
F1 solenoid
Effective area (mm2)
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com
Effective area (mm2)
Current
ntr
ol
Closed
ol
A
A
P
P
ntr
co
Flow rate
2 port
co
Current A
Current A
14-9-13
4
Series
VEF/VEP
Pressure Type: VEP
Diagram of Working Principle
Current-Pressure Characteristics
The control opening becomes closed when the
solenoid's pulling force (F1) balances with the
force (F2), which is created by the outlet
pressure (P2) that passes through the feedback
passage and acts on the spool surface. As a
result, the outlet pressure (P2) is established.
The horizontal axis of the characteristics
represents the output amperage of the power
amplifier VEA25. (If NULL and GAIN are in the
shipping condition, 0 to 1 A can be viewed by
substituting them with command signals 0 to 5
V.)
Outlet pressure (MPa)
F1 solenoid
Controlled
opening
R A Flow rate (l/min (ANR)) P A
Feedback passage
Inlet pressure: 1.0 MPa
Current A
Set point
Outlet pressure (MPa)
(P2 =
(P1 =
Inlet pressure) Outlet pressure)
Outlet pressure (MPa)
B 8372 (In accordance
Pressure Characteristics JIS
with air regulator)
Inlet pressure P1 (MPa)
R A Flow rate (l/min (ANR)) P A
Outlet pressure (MPa)
Inlet pressure: 0.3 MPa
Set point
R A Flow rate (l/min (ANR)) P A
Inlet pressure P1 (MPa)
14-9-14
Outlet pressure (MPa)
Set point
Inlet pressure P1 (MPa)
Outlet pressure (MPa)
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com
Sleeve
Inlet pressure: 1.0 MPa
Outlet pressure (MPa)
Spool
Flow Characteristics
5
Electro-pneumatic Proportional Valve
Series
VEF/VEP
Construction
Flow type: VEF2121 (2 port)
VEF3121 (3 port)
Pressure type: VEP3121 (3 port)
P(1) port R(3) port
F.R.L.
AV
AU
AF
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com
AR
IR
VEX
AMR
Flow type: VEF2131 (2 port)
Flow type: VEF2141 (2 port)
VEF3141 (3 port)
Pressure type: VEP3141 (3 port)
ITV
IC
VBA
VE
VY1
G
PPA
AL
Component Parts
No.
q
w
e
r
t
y
u
i
o
!0
Description
Body
Sub-plate
Spool
Sleeve
Mold coil
Solenoid cap assembly
Movable core assembly
End cover
Bush
Set bushing
Material
Aluminum alloy
Aluminum alloy
Special stainless steel
Special stainless steel
—
Aluminum alloy
—
Aluminum alloy
Resin
Brass
Note
Metallic painted
Metallic painted
—
—
—
Metallic painted
—
—
—
—
No.
!1
!2
!3
!4
!5
!6
!7
!8
!9
@0
Description
Gasket
Spring
Spring seat
O-ring
O-ring
O-ring
Hex. socket head cap screw
Hex. socket head cap screw
Hex. socket head cap screw
Lock nut
Material
NBR
Stainless steel/Piano wire
Brass
NBR
NBR
NBR
Chromium-molybdenum
Chromium-molybdenum
Chromium-molybdenum
NBR
Note
—
—
—
—
—
—
—
—
—
—
14-9-15
6
Series
VEF/VEP
Flow Type: VEF, Pressure Type: VEP Dimensions
Flow type: VEF2121, VEF3121
Pressure type: VEP3121
3-ø5.5
Mounting hole
A(2) port
2 port: R port plug
P(1) port R(3) port
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com
Cabtire cable
O.D. ø6.8 to ø11.5
3-Rc 1/4, 3/8
Flow type: VEF2141, VEF3141
Pressure type: VEP3141
Flow type: VEF2131
3-Rc
3/8, 1/2, 3/4
2-Rc
1/4, 3/8, 1/2
A(2) port
P(1) port
A(2)
port
P(1) port
R(3)
port
Cabtire
cable
O.D. ø6.8 to ø11.5
Cabtire cable
O.D. ø6.8 to ø11.5
2 port: R port plug
4-ø9
Mounting hole
3-ø7 mounting holes
14-9-16

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