∗∗

1.14-1

03

Electro-pneumatic valve: Flow style (VEF)

Flow style

3 4 1 11VEF

Port Body sizeStandard characteristics Port size

Electro-pneumatic valve: Pressure style (VEP)

PortSymbol

123

1395

128

4.52.5

1 30

451

3

3

2

2

2

4

14

—

0203

W/o sub-plate

Rc(PT)1/4

Rc(PT)3/8

W/o sub-plate

Rc(PT)1/4

Rc(PT)3/8

—

0203

020304030406

Rc(PT)1/4Rc(PT)3/8Rc(PT)1/2Rc(PT)3/8Rc(PT)1/2Rc(PT)3/4

1234

Body sizeSymbol

Std.characteristics

Symbol Max. eff. area mm2Port sizeSymbol

0.05s or less

Specifications

Proportional Solenoid Specifications

Style Flow style Pressure style

Item

Port size Rc(PT)

Fluid Air (Inert gas)

3% F.S.

0.5% F.S.

3% F.S. or less

Not required (Use turbine oil class 1 ISO VG32, if lubricated)

3% F.S.

1.5MPa

1.0MPa

0 to 50°C (Non condensation)

Proof pressure

Max. operating pressure

Hysteresis

Sensibility

Linearity

Lubrication

Weight (kg)

Ambient and fluid temperature

Response time

Repeatability

VEF2121VEF3121

VEF2141VEF3141

VEF2121 VEP3121 VEP3141

0.03s or less 0.03s or less 0.05s or less

0.9 0.91.0 1.41.4

VEA25l 1A

1 (Applicable power amplifier: VEA25l)

Max. current

Rated power consumption

Coil insurance

Max. temperature

Electrical entry

Proportional solenoid recognition symbol

Applicable power amplifier

Coil resistance

4,1 83 4,1 834,1 8,3 21 8,3 2,1 43 8,3 2,1 43

13Ω (20°C)

Class H or equivalent (180°C)

DIN type terminal

13W (20°C, at max. current)

140°C (at max. current)

030406

25Rc(PT)3/8Rc(PT)1/2Rc(PT)3/4

Applicable power amplifier

Symbol

1

Power amplifier

VEA25l

03Pressure style

4 1 1VEP31

Body size Standard characteristics Port size

1

2

14

2—

0203

W/o sub-plate

Rc(PT)1/4

Rc(PT)3/8

030406

Rc(PT)3/8

Rc(PT)1/2

Rc(PT)3/4

Body sizeSymbol

Standard characteristicsSymbol Setting pressure range (MPa)

0.05 to 0.65MPa

0.1 to 0.9MPa

0.005 to 0.15MPa

Port sizeSymbol

Applicable power amplifier

Symbol

1

Power amplifier

VEA25l

VEF3141(Flow style)

VEF2131(Flow style)

VEP3121(Pressure style)

VEP3141(Pressure style)

Controls the flow rate steplessly according to current. (It is a 2/3 port valve that has an electrical throttle valve function.) A model that is suitable for operating conditions, such as the number of ports or maximum effective area, can be selected.

Controls the pressure steplessly according to current. Also, because the effective fully opened area of the exhaust side is identical due to its construction, this valve provides a large exhaust capacity and can be used as a relief valve. (It is a 3 port valve that has an electrical pressure reducing valve function.)

VEF3121(Flow style)

How to Order

AC

AV

AU

AF

AR

IR

VEX

AW

AMR

AWM

AWD

ITV

VBA

VE

VY

G

AL

Electro-Pneumatic Proportional Valve

Series VEF/VEP

VEF/VFP Series 2/15/99 10:31 AM Page 1

∗∗

1.14-2

How to Use DIN Terminals

Wiring procedure

Connection

Terminal blockConnection 3 is not usedfor terminal 1 and 2.∗Coil has no polarity

Caution

Application Examples

Controlling pressure for die press cushion Controlling multispeed of cylinder

Controlling welding pressure ofwelding machine electrode

Controlling pressure of lowpressure die casting

Controlling rotation of air motor

qLoosen the retaining screw and pull the connector from the pin plug.

wMake sure to remove the retaining screw, insert the tip of a flat head screw driver into the groove below the terminal block and pry it up to separate the terminal cover from the terminal block.

eSecurely connect the wires to the specified terminals in accordance with the wiring procedure.

Applicable cable (Heavy insulation cable)

Outlet changing procedureTo 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).

0.75mm2, 1.25mm2/2-core, 3-core (O.D. ø6.8 to ø11.5) based on JISC3312 and C3322

Precautions

Caution

Caution

qAir source

eLubrication

rManual operation

wInstallation

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 the No.4 system of the Compressed Air Cleaning Systems catalog on p.4.0-1.

IThoroughly flush the pipes to completely remove any dust or scales from the inside of the pipes.

IInstall a silencer (AN series) on the exhaust port.

IBe careful with the mold coil because it generates heat while current is applied to it.

IVibrations 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.

This product can be used without lubrication. To lubricate, use class 1 ISO VG32 turbine oil (non-additive type). Spindle oil, machine oil, or grease cannot be used.

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.

VE lll0 must be used in conjunction with the power amplifier VEA1ll.

An old VEA1llcannot be used in combination with the current VE lll1.

PF

P F

The previous types VE lll0 and VEA1llP F

Be sure to read before handling. Refer to p.0-26 and 0-27 for Safety Instruction and common precautions on the products mentioned in this catalog.

VEF/VFP

VEF/VFP Series 2/15/99 10:31 AM Page 2

∗∗

1.14-3

Flow Characteristics/3 PortOperation Principle Diagram

Flow Characteristics/2 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.

AC

AV

AU

AF

AR

IR

VEX

AW

AMR

AWM

AWD

ITV

VBA

VE

VY

G

AL

Electro-Pneumatic Proportional Valve VEF/VEP

VEF/VFP Series 3/9/99 9:47 PM Page 3

∗∗

1.14-4

Flow CharacteristicsCurrent-Pressure Characteristics

Pressure Characteristics JIS B8372

Operation Principle DiagramThe control opening becomes closed when the solenoid's pulling force (F1) balances with the force (F2), which is created by the secondary pressure (P2) that passes through the feedback passage and acts on the spool surface. As a result, the secondary pressure (P2) is established.

The horizontal axis of the characteristics represents the output current of the power amplifier VEA25l. (If NULL and GAIN are in the shipping condition, 0 to 1A can be viewed by substituting them with command signals 0 to 5V.)

Pressure Control Style: VEP

(In accordance with air regulator)

VEF/VFP

VEF/VFP Series 3/9/99 9:48 PM Page 4

Construction

Flow style: VEF2131(2 port)

No. Description NotesMaterialMetallic paintedMetallic painted

———

Metallic painted—

Aluminum alloyAluminum alloy

Special stainless steelSpecial stainless steel

—Aluminum alloy

—

BodySub-plateSpoolSleeveMold coilSolenoid cap ass'yMovable core ass'y

q

w

e

r

t

y

u

Component Parts

Replacement Parts

No. DescriptionPart number

Material

DXT172-3DXT172-6

DXT172-14-lDXT172-7

DXT172-8-l—

AS568-014AS568-016AS568-021

M4 X 32, With WM4 X 10, With WM4 X 60, With WDXT010-11-7

VEl 12023

—VEP3-4

—XT019-2

DXT172-8-7VEP3-3

AS568-018—

AS568-021——

M4 X 60, With WDXT010-11-7

VEF2131———

VEP4-7VEP4-8-l

VEP4-5AS568-119

—AS568-021

—M4 X 10, With WM4 X 60, With WDXT010-11-7

VEl 140Aluminum alloy

ResinBrassNBR

Stainless steel/Piano wireBrassNBRNBRNBR

Chromium-molybdenumChromium-molybdenumChromium-molybdenum

NBR

End coverPushSet pushingGasketSpringSpring seatO ringO ringO ringHex. socket head cap screwHex. socket head cap screwHex. socket head cap screwLock nut

i

o

!0

!1

!2

!3

!4

!5

!6

!7

!8

!9

@0

23

Flow style: VEF2141(2 port) VEF3141(3 port)Pressure style: VEP3141(3 port)

Flow style: VEF2121(2 port) VEF3121(3 port)Pressure style: VEP3121(3 port)

1.14-5

∗∗∗

AC

AV

AU

AF

AR

IR

VEX

AW

AMR

AWM

AWD

ITV

VBA

VE

VY

G

AL

Electro-Pneumatic Proportional V alve VEF/VEP

VEF/VFP Series 4/2/1999 2:57 PM Page 5

Flow style: VEF2121, VEF3121Pressure style: VEP3121

Dimensions/Flow style: VEF, Pressure style: VEP

Flow style: VEF2141, VEF3141Pressure style: VEP3141

Flow style: VEF2131

403-ø5.5Mounting hole

A(2) port

2 port: R port plugP(1) port R(3) port

G(PF)1/2

Cabtire cableO.D.ø6.8 to ø11.5

1225025

2813

3-Rc(PT) 1/4, 3/8

101

113

21

2-Rc(PT)1/4, 3/8, 1/2

A(2) port

35

A

64

51 6595

129

P(1) port

50

102

50

3-ø7 Mounting hole

G(PF)1/2

Cabtire cableO.D. ø6.8 to ø11.5

154.

512

0.5 A(2)

port

53

82

3536

P(1) port

3-Rc(PT) 3/8, 1/2, 3/4

R(3)port

58

81

12

R

P

2 port: R port plug

52

66

110.

5

4-ø9Mounting hole

G(PT)1/2

58

64

9

45 56 64

P

Cabtire cableO.D. ø6.8 to ø11.5

1.14-6

∗∗

VEF/VFP

VEF/VFP Series 2/15/99 10:33 AM Page 6