Yoshitake CT-1 Manuale utente

■

EPDT-318a

■

MODEL CT-1

CONTROL VALVE

PRODUCT MANUAL

Thank you very much for choosing the Yoshitake’s product. To ensure the correct and safe use of

the product, please read this manual before use. This manual shall be kept with care for future

references. The symbols used in this manual have the following meanings.

Warning

This symbol indicates a potentially hazardous situation that, if not

avoided, could result in death or serious injury.

Caution

This symbol indicates a hazardous situation that, if not avoided, may

result in minor or moderate injury or may result in only property

damage.

Table of Contents

1. Specifications····························································1

2. Nominal size selection ················································2

3. Appearance and dimensions ····································· 3-4

4. Structure··································································5

5. Operation·································································5

6. Operating example·················································· 6-7

7. Storage ···································································8

8. Installation

8.1 Installation for body part ······································· 8-9

8.2 Wiring and piping·············································10-12

8.3 Test run····························································· 13

8.4 Positioner readjustment ····································13-16

9. Warning and caution for use ······································· 16

10. Maintenance and inspection

10.1 Troubleshooting················································· 17

10.2 Warning and caution for maintenance····················· 18

10.3 Dairy inspection················································· 18

10.4 Regular inspection ············································· 18

10.5 Replacing gaskets, packings and positioners············ 18

Warranty Information

-1-

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EPDT-318a

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Caution

(1) Please confirm that the indications on the product correspond with the specifications of

the ordered product model before use.

* If they are different, do not use the product and contact us.

(2) This product might be discontinued or improved without prior notice.

(3) In order to ensure successful and safe operation of our valves the entire operation

manual must have been read thoroughly and understood prior to installation and

commissioning, maintenance, otherwise, serious injury or equipment malfunction could

happen and control valve may be damaged. It is out of the guarantee repair or

replacement are not uncompensated by us

This is the diaphragm type control valve that controls the pressure, flow rate, liquid surface

and temperature by using electrical/pneumatic positioner

1. Specifications

Model

Size 15

～

100A

Application

Control Steam, Air, Cold and hot water, Oil,

dangerous fluid

Driving

force

Compressed air

Connection JIS 10KRF

Temperature -5

～

210

℃

（

Freeze is not available

）

Valve

(Flow)

characteristic

Equal percent

Range ability 30:1

Valve & valve seat

Metal seal

type

Leakage rate Cv×less than or 0.01%(ANSI Class

Ⅳ

)*1

Driving type

Pneumatic single acting

diaphragm drive

Actuator action Normal closed *2

Operation air pressure 0.1

～

0.3MPa

Ambient temperature -20

～

℃

Material

Body

SCPH2 (A216 WCB)

Valve Stainless steel

Valve seat

Stainless steel

Gasket

Stainless steel

Graphite coating

Grand packing PTFE

Diaphragm

EPDM

Accessory

EP-1type DC4

～

20mA electrical/pneumatic positioner

（

2wires

）

EP-1Stype DC4

～

20mA smart positioner

（

2wires

）

Air regulator

（

Pressure regulator

）

*1: As for the Cv value, please see “2. Nominal size selection” shows rated Cv

value.

*2: In case of no inlet signal, valve is closed because of spring load, and inlet signal

is increased, valve will be opened.

*3: Please apply air pressure between 0.4-1.0 MPa for air regulator.

-2-

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EPDT-318a

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2. Nominal size selection

The appropriate nominal size can be calculated by obtaining the Cv value for the

operating conditions in question, as shown below.

【

In case of steam application

】

：

Inlet press.(MPa

･

：

Max. steam flow rate(kg/h)

：

Reduced press.(MPa

･

ΔP

：Ｐ

－Ｐ

(MPa)

：

1+0.0013×

｛

Super-heated temp. (

℃

)

－

Saturated heat temp. (

℃

)

｝

：

Cv value depend on each size

【

In case of air application

】

：

Inlet press.(MPa

･

：

Max gas flow rate (m

/h nominal

condition)

：

Reduced press.(MPa

･

：

Gas temperature(

℃

)

ΔP

：

－

P2(MPa)

：

Specific gravity ( it is against air)

：

Cv value depend on each size

【

In case of liquid

】

：

Max. liquid flow rate (m

/h)

G:Specific gravity (It is against

water)

ΔP

：

－

P2(MPa)

：

Cv value depend on each size

Rated Cv value

Size

15A

20A

25A

32A

40A

50A

65A

80A

100A

Rated Cv value

6 9 14 25 33 50 85 106

175

Caution

When selecting pipe size, please take piping condition and application into consideration

and secure a safety rate of 80 %

)PP(P138

＞

≦

P120

＞

≦

)PP(P

G)t273(

2940

P2550

G)t273(Q

GV365.0

-3-

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EPDT-318a

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Type EP-1 4-20mA

Electrical/pneumatic

positioner

Current signal input

G 1/2

Compressed air

input

Air regulator

3. Appearance and dimensions

(mm)

Size L HA HB A Stroke Weight(kg)

15A

184

276

100

220

20A 184 276 100 220 20 13

25A

184

276

220

32A 222 320 111 270 25 22

40A

222

320

111

270

50A

254

320

124

270

65A 276 394 135 350 30 48

80A

298

394

350

100A 352 394 187 350 40 75

*In case of including accessories, it is provided as following condition.

[EP-1type electrical/pneumatic positioner]

-4-

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EPDT-318a

■

Type EP-1S 4-20mA

Smart

positioner

Current signal

Input G1/2

Compressed

air input

Air regulator

(mm)

[EP-1S type smart positioner]

(mm)

Size WA WB

15A

295 230

20A

25A

32A

305 23540A

50A

65A

320 240

80A

100A

Size

15A

290

210

20A

25A

32A

300

40A

50A

65A

31080A

100A

-5-

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EPDT-318a

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4. Structure

5. Operation

This product is a reverse-operated, and valve opens by the air pressure increased in

the diaphragm case. Operated air pressure passes through the air connection port of

the bottom diaphragm case”26”, and by increasing air pressure on the diaphragm and

the diaphragm follower”30”, the spring”31” is compressed by the direction of spring is

compressed. And the valve”5” is opened by displacing upward of the diaphragm

rod”27” and connector”14” which is assembled with the diaphragm follower”30”, and

the fluid flows. In addition, the valve is displaced to the closing direction when the air

pressure is decreased.

Body

①

Valve seat

③

Cage

④

Gland packing

⑥

Yoke

⑬

Connector

⑭

Diaphragm rod

Diaphragm follower

Spring

Upper diaphragm case

Eye bolt

Diaphragm

Bottom diaphragm case

Name plate

Indicator plate

⑱

Bonnet

②

Valve

⑤

Air inlet

Nut

⑳

Gland flange

⑮

Drive parts

（

Actuator

）

Body part

Diaphragm bolt

Nut

⑪

Gasket

⑧

-6-

■

EPDT-318a

■

Pressure

gauge

Controller

DC4-20mA

Pressure

transmitter

Pressure

gauge

CT-1 Control valve

(EP

CT-1 Control valve

(EP

DC4-20mA

Controller

Input signal

Flowrate transmitter

6. Operating example

*Please prepare the sensor or measuring instrument by user themselves.

【

Example of pressure control

】

[Example of flow control

】

Signal

Valve action

(Open degree of

valve

）

Fluid

20mA

Signal

increase

4mA

Full

opened

(100%)

Open

Full closed

(0%)

Press.

：

Min.

Press.

：

Decrease

Press.

：

Max.

Signal

Valve action

（

Open degree of

valve

）

Flow rate

20mA

Signal

increase

4mA

Full

opened

(100%)

Open

Full closed

(0%)

Flow rate

：

Max.

Flow rate

：

Increase

Flow rate

：

Min.

-7-

■

EPDT-318a

■

Pressure

gauge

CT-1 Control valve

(EP

DC4-20mA

Input signal

Level sensor

Tank

Pressure

gauge

CT-1 Control valve

(EP

Controller

DC4-20mA

Input

signal

Controller

Temperature

sensor

Storage

Tank

【

Example of water level control

】

【

Example of temperature control

】

Signal

Valve action

（

Open degree of

valve

）

Tank

20mA

Signal

increase

4mA

Full opened

(100%)

Open

Full closed

(0%)

Water level

：

Surge

Water level

：

Increase

Water level

：

No change

Signal

Valve action

（

Open degree of

valve

）

Fluid Fluid in the tank

20mA

Signal

increase

4mA

Full

opened

(100%)

Open

Full

closed

(0%)

Steam flow rate

：

Max.

Steam flow rate

：

Increase

Steam flow rate

：

Flow rate 0

Temperature

：

Max.

Temperature

：

Increase

Temperature

：

No change

-8-

■

EPDT-318a

■

7. Storage

Please storage the product in the package by installation. During storage, please follow

these points.

* After open the package for checking product, please storage into original package

again.

* Do not storage the product where rain falls, temperature is above 60

℃,

and dust or

mist make damage for the product.

* Before installation, do not remove seal and plastic cap which is used for pneumatic

and electrical connection.

8. Installation

8.1 Installation for body part

Warning

(1)

Due to heavy product, make sure to use hanging machine to hold the product. When

hang this product up from package, use adequate hanging belt.

Eye bolt is installed at actuator in aim of hanging. When using eye bolt, use both

eyebolt and make hanging belt same load at both side. (See Fig.4)

Besides, do not hold positioner when installation.

*Otherwise product may fall and cause injury.

Eye bolt

Shackle

Hanging belt

ig.4

-9-

■

EPDT-318a

■

(mm)

Ground

Caution

(1) Do not disassemble the valve unreasonably

Disassembling the valve at your discretion may affect the original performance

(2) Remove foreign matter and scales from the lines before connecting the valve.

(3) Install the stop valve before and after the control valve

(4) To ensure the connect properly without any leakage.

*If the connecting way is improper, leakage may be happened by vibration. And in

case of high temperature, it may result in personal injury.

*When using the seal tape for piping, be aware not to enter it inside valve. In case of

the seal tape for piping enter the valve, it may result in malfunction or device

damage.

(5)

install the product, check the direction of the product so that the fluid flowing and the

arrow marked on the product are in the same direction.

(Install the valve perpendicularly to horizontal lines).

Please see the fig 5.

*Improper installation causes the malfunction.

(6) Do not apply excessive load, torque or vibration to the valve

(7) Do not get out the seal or polyethylene cover from the positioner or regulator until the

pneumatic piping or construction of the electrical signal wiring is started.

(8) The area to be frozen, please have the step to prevent from freezing.

If the fluid is frozen, it may result in malfunction.

*In order to have easy maintenance, be sure to have enough space for inspection.

Please see the fig.5.

*Ambient temperature of the location where installing the valve should be between

-20

～

℃

. In addition, please use the shielding plate or insulation in case the valve

is affected by direct sunlight or radiant heat.

Size A

15A

150

350

20A

25A

32A

160

360

40A

50A

65A

190

380

80A

100A

Fig

Please keep enough space

for inspection.

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