Yoshitake CT-1 User manual

■ 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- ■ EPDT-318a ■
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
CT
-
1
Size 15 ～ 100A
Application
Control Steam, Air, Cold and hot water, Oil,
N
on
-
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 ～ 70 ℃
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- ■ EPDT-318a ■
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 】
P
1
： Inlet press.(MPa ･ A) W ： Max. steam flow rate(kg/h)
P
2
： Reduced press.(MPa ･ A) ΔP ：Ｐ
1
－Ｐ
2
(MPa)
k ： 1+0.0013× ｛ Super-heated temp. ( ℃ ) － Saturated heat temp. ( ℃ ) ｝
Cv ： Cv value depend on each size
【 In case of air application 】
P
1
： Inlet press.(MPa ･ A) Q ： Max gas flow rate (m
3
/h nominal
condition)
P
2
： Reduced press.(MPa ･ A) t ： Gas temperature( ℃ )
ΔP ： P1 － P2(MPa) G ： Specific gravity ( it is against air)
Cv ： Cv value depend on each size
【 In case of liquid 】
V ： Max. liquid flow rate (m
3
/h) G:Specific gravity (It is against
water)
ΔP ： P1 － P2(MPa)
Cv ： 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
Wk
Cv
21
Δ
2
P
P
1
2
＞
2
P
P
1
2
≦
1
P120
Wk
Cv
2
P
P
1
2
＞
2
P
P
1
2
≦
)PP(P
G)t273(
2940
Q
Cv
21
Δ
1
P2550
G)t273(Q
Cv
P
GV365.0
Cv
Δ

-3- ■ EPDT-318a ■
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
20
13
20A 184 276 100 220 20 13
25A
184
276
10
6
220
20
16
32A 222 320 111 270 25 22
40A
222
320
111
270
25
22
50A
254
320
124
270
25
28
65A 276 394 135 350 30 48
80A
298
394
16
7
350
4
0
61
100A 352 394 187 350 40 75
*In case of including accessories, it is provided as following condition.
[EP-1type electrical/pneumatic positioner]

-4- ■ 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
X
A
X
B
15A
290
210
20A
25A
32A
300
40A
50A
65A
31080A
100A

-5- ■ EPDT-318a ■
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
-
1)
CT-1 Control valve
(EP
-
1)
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
-
1)
DC4-20mA
Input signal
Level sensor
Tank
Pressure
gauge
CT-1 Control valve
(EP
-
1)
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
F
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) To
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 ～ 70 ℃ . In addition, please use the shielding plate or insulation in case the valve
is affected by direct sunlight or radiant heat.
Size A B
15A
150 350
20A
25A
32A
160 360 40A
50A
65A
190 380
80A
100A
Fig
.5
Please keep enough space
for inspection.