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.

-10- ■ EPDT-318a ■
Type EP-1 4-20mA
Electrical/pneumatic
positioner
Current signal input
G 1/2
Compressed air
input
Air Regulator
8.2 Wiring and piping
Warning
(1) Electrical wiring must be done by expert or professional person.
(2) This product is not available for the place (Atmosphere) where have the retention of
explosive gas.
*Since it is not in the explosion-proof structure, there is a danger of fire.
(3) When having the wiring work, please do the work in an environment where does not
enter the rainwater or surrounding water. Also please make sure the rainwater or
surrounding water so not enter the wiring port.
*In case of water enters there, there is the risk of electric shock
(4) When wiring, please make sure the power supply is not provided.
Caution
(1) Please have the proper piping diameter so as not to have pressure drop when piping to
the positioner.
*The valve may not work properly.
(2) When using the seal tape for piping, be aware not to enter it inside valve. If the seal
tape for piping enter the valve, it may result in malfunction or device damage.
(3) The compressed air the supply to the actuator, positioner and air regulator must the
clean dry air which is not include the moisture, oil, and foreign matter.
*The valve may not work properly if the foreign matter comes in.
(4) When purchasing the accessories, the air regulator and positioner are connected to the
actuator when supplying, so please do not give the damage to the piping of air regulator
and wiring for positioner.
【 Method of connecting the air piping to the air regulator 】
・ When purchasing the goods with accessories, it is delivered by the structure with shown
in Fig. 6-7. Please connect the air piping to the operating air connection port in Fig.6-7.
Fig
.6

-11- ■ EPDT-318a ■
Terminal box
cove r
Set
screw Black wire
Red
wire
External input line [-]
And terminal fastening
bolts
After
removing the
terminal box
cove r
External input line [+]
And terminal
fastening bolts
Terminal block
connection part
Gland earth
terminal
Fig. 7
【 How to connect the signal cable to the pneumatic positioner 】（ In case of EP-1 type ）
・ When purchasing the goods with accessories, it is delivered by the structure with shown
in Fig. 6. Please draw the signal cable from the external DC signal connection port shown
in Fig.6. Connection way is 2 wire type. Please confirm and do wire the DC 4-20mA with
the external signal line.
*Terminal wiring method （ See Fig.8 ）
① Remove the set screw of the terminal box (Use the hex wrench) and remove the
terminal box cover.
② Please connect the positive terminal of the terminal block located in the terminal
box to the positive line of external input line. (In case of negative terminal, please
connect the negative terminal of the terminal block located in the terminal box to
the negative line of external input line). To protect the positioner, earth the gland
earth terminal. When connecting, please tighten the terminal fastening firmly so
that there is no connection failure.
③ After connecting the external line, tighten and fix the set screw after closing the
terminal box cover. (Tightening torque: 0.25N · m)
Fig
.8

-12- ■ EPDT-318a ■
Cover
Screw
Display
Terminal
fastening
bolt (M3)
External
gland earth
Terminal
(M4)
After
removing
cove r
Input signal [+]
terminal
Input signal [-]
terminal
Internal gland earth
terminal
【 How to connect the signal cable to smart positioner 】（ In case of EP-1S type ）
・ When purchasing the goods with accessories, it is delivered by the structure with shown
in Fig. 7. Please draw the signal cable from the external DC signal connection port shown
in Fig.7. Connection way is 2 wire type. Please confirm and do wire the DC 4-20mA with the
external signal line. The positioner operates at 3.2 mA DC of minimum supply current. Do
not supply more than 24 mA DC.
*Terminal wiring method （ See Fig.9 ）
① Remove the cover on the positioner by loosen 4 screws.
② Connect external input line[+] to [IN+] terminal box and external input line[-] to [IN-]
terminal box at left side of positioner. To avoid defective of cable, fix the cable by terminal
fastening bolt (M3 screw).
③ To protect the positioner, earth the inside or outside gland earth terminal.
④ After connect external cables, tighten the screw and fix the cover. Please put cover as
display can be shown.
Fig.9

-13- ■ EPDT-318a ■
C
over
Screw
Zero-adjustment part
Span adjustment part
8.3 Test run
If the product comes with accessories, it is shipped with positioner set to zero point
and the span adjusted, but it may be dropped or received impact during transportation
or installation, so before operation, be sure to have a test run.
Caution
The product operates while a test run. Be sure to con
duct a test run before operation.
And, please have a test run in a pressure-free state with no fluid inside.
[Test run procedure]
(1) Connect a regulator or current generator so that the positioner receives a 4-
20mA DC pseudo input signal.
(2) With the air pressure applied to the air regulator, confirm the product operates
with its opening from 0 to 100% when the pseudo input signal of 4 to 20mA DC
(0 to 100%) is given to the positioner and changed between 0-100%. If the
opening is incorrect, readjust the positioner according to "8.4 Positioner
readjustment".
8.4 Positioner readjustment
Caution
The product operates during the positioner adjustment, so make sure that there is no fluid
inside the product, and readjust the positioner under no pressure.
【 For EP-1 electropneumatic positioner 】
(1) Loosen 4 screws on the cover with a cross-head screwdriver and remove the
cover. Then, readjust the zero-adjustment part and the span adjustment part.
(Fig. 10)
Fig.10

-14- ■ EPDT-318a ■
(2) Supply air pressure by the air regulator, and
input the signal (4mA DC) of zero opening into
the positioner. Then turn the knob of the zero-
adjustment part clockwise or counterclockwise
to align the initial point (zero point) of the
actuator. In the right figure, the "+" is the
direction in which the zero point becomes
higher, and the "-" is the direction in which the
zero point becomes lower.
After that, check that the pointer of the pressure
gauge attached to the positioner starts to move
when the input signal is 4.8 to 4.9 mA DC. If it does
not move, adjust it to the position where the pointer
of the pressure gauge starts to move with the zero
adjuster.
(3) Loosen the lock screw of the span adjustment
part. After finishing the zero-point adjustment,
apply the input signal (12mA DC) of 50%
opening into the positioner. In this state, adjust
the scale position of the stroke indicator plate
attached to the actuator to half of the position
of the full stroke. If the position is low, turn the
span in the "+" direction to increase the span,
and if the position is high, turn the span in the
"-" direction to decrease the span.
Next, apply the input signal (20mA DC) of
100% opening into the positioner. In this state,
adjust the scale position of the stroke indicator
plate attached to the actuator to the full stroke
position.
If the above span adjustment is performed, the
zero-point changes. So, after adjusting the
span, check the zero point again with the input
signal (4mA DC) of zero opening and readjust.
Repeat steps (2) and (3) until the stroke
position stabilizes in this process.
(4) When the adjustment is completed, tighten the lock screw of the span adjustment
part. And install the cover in the reverse order (1)

-15- ■ EPDT-318a ■
Cover
Screw
Example of display
(Power is supplied)
【 For EP-1S smart positioner 】
EP-1S type has auto-calibration function, so auto-calibration can be done the
positioner readjustment.
* Method of auto-calibration (See Fig.11-13)
① Confirm display works (power is supplied) and air is supplied to positioner.
② Loosen screw on the cover of positioner (4point) and remove the cover.
Fig. 11
③ Input 12mA DC to positioner. Auto calibration cannot be conducted with any
other input signal. Press and hold [ ] (hereafter ENTER key) for approx. 3
seconds. [AUTO CAL] is shown on the display. Press ENTER key once, and
[AUTO1] appears. Press ENTER key and auto-calibration starts. (Fig.12)
Auto-calibration requires around 2-3 minutes depending on the size.
[Complete] is shown when finished. Press ENTER key, and then positioner is put
into usual operation mode.
Fig. 12

-16- ■ EPDT-318a ■
Calibration is
completed
Push
Enter key
Push
Enter key
6sec.
Push
Enter key
Push
Enter key
Fig. 13
④ Auto-calibration is completed when display shows standard indication as Fig.13.
Mount cover on the positioner and fix by tightening screw. Please put cover as display
can be shown.
*During calibration, if 「 CHK AIR 」 is shown, air is not supplied to positioner. In this case,
please check air connection.
9. Warning and caution for use
Warning
(1) Before flow the steam in pipe line, make sure steam can flow without any dangerous at
the end of pipe line and pipe line is connected tightly.
*Failure to follow this notice may result in burns and property damage.
(2) Do not touch the valve directly with bare hands.
*Failure to follow this notice may result in burns.
Caution
(1) Be sure to close the terminal box cover
*In case of remaining the cover opened, rainwater or surrounding water enter inside
and it cause the leakage and malfunction
Calibration starts

-17- ■ EPDT-318a ■
10 ． Maintenance and inspection
10.1 Troubleshooting (Please see the structure described 4)
Problem Cause Solution
Not working
1 ． Operating pneumatic
pressure or external signal
are not supplied.
1 ． Please confirm the presence or
absence of the operating air
(more than 0.35MPa) by the
pressure gauge, etc. And
confirm the external signal
tester by using tester.
2 ． Air piping is clogged or
leaked.
2 ． In case of clogged, please clean
it. When leaking, please replace
the piping.
3 ． Diaphragm bolt is loosen. 3 ． Retighten it.
4 ． Leakage is happened
between bottom diaphragm
case and diaphragm rod.
4 ． Replace the product.
5 ． Failure is occurred on
accessories of positioner or
regulator.
5 ． Inspect or replace the positioner
or regulator.
6 ．
Failure is occurred on body
part or actuator
6 ． Inspect or replace the product.
7 ． Sensitivity of the positioner is
inadequate.
7 ． Replace the positioner.
Working is
unstable
1 ． Abnormal signal from the
controller
1 ． Adjust controller again and
confirm the signal system.
2 ． Operating pneumatic
pressure is not constant.
2 ． Check the air piping and
exchange it to the bigger piping
diameter.
Leakage from
valve ⑤
1 ．
The valve does not move to
the full closed position ( Not
moving downward )
1 ． Adjust the zero point again by
using the controller.
2 ．
There are any scratches on
the valve seat ③ 1 or valve ⑤
2 ． Replace the product.
Leakage from
grand packing ⑥
or gasket part ⑧
1 ． The nut on grand part ⑳ or
body part ⑪ is loosen.
1 ． Retighten the nut. After
retightening, there is still leak,
exchange the packing
.
2 ． The harden pf the grand
packing ⑥ or gasket ⑧
2 ． Replace them.

-18- ■ EPDT-318a ■
10.2 Warning and caution for maintenance
Warning
(1) Do not touch the valve or piping directly with bare hands
*Failure to follow this notice may result in burns
(2) Do not disassemble the valve unreasonably
*Disassembling the valve at your discretion may affect the original performance
*In case of disassembling, please be sure to ask our staff
Caution
(1) In case of no operation for a long period of time or regular inspection, discharge
internal pressure from the valves, lines, and equipment completely.
* The scale or foreign matter inside of the pipe may cause malfunction.
(2) After having the long term suspension, please do the inspection before re-operation.
10.3 Daily inspection
Please check the leakage from the pipe and the body portion (leak sound, etc.) following
items during operation of facilities.
10.4 Regular inspection （ 1 time ／ Month ）
(1) Please make sure that there is no looseness on the installed piping of inlet and outlet
side of the product.
(2) Giving a false signal of 4-20mA DC to positioner, when it is changed by the opening
signal from 0 to 100%, please make sure that the product is operated by the opening
degree of 0 to 100%
*If the abnormality is found, please contact us.
10.5 Replacing gaskets, packings and positioners
For disassembling the product by replacing the gasket, packing, or positioner, please
refer to SM-741 "CT-1 Disassembly and Assembly Procedure".
Although it varies greatly depending on the use conditions, the recommended period for
replacing gaskets and packings is about two years.

2015.8
PDD-046e
Warranty Information
1. Limited warranty
This product has been manufactured using highly-advanced techniques and subjected to
strict quality control. Please be sure to use the product in accordance with instructions on
the manual and the label attached to it.
Yoshitake warrants the product to be free from any defects in material and workmanship
under normal usage for a period of one year from the date of receipt by the original user, but
no longer than 24 months from the date of shipment from Yoshitake’s factory.
2. Parts supply after product discontinuation
This product may be subject to discontinuation or change for improvement without any prior
notice. After the discontinuation of the product, Yoshitake supplies the repair parts for 5
years otherwise individually agreed.
3. This warranty does not cover the damage due to any of below:
(1) Valve seat leakage or malfunction caused by foreign substances inside piping.
(2) Improper handling or misuse.
(3) Improper supply conditions such as abnormal water pressure/quality.
(4) Water scale or freezing.
(5) Trouble with power/air supply.
(6) Any alteration made by other than Yoshitake.
(7) Use under severe conditions deviating from the design specifications
( e.g. in case of corrosion due to outdoor use).
(8) Fire, flood, earthquake, thunder and other natural disasters.
(9) Consumable parts such as O-ring, gasket, diaphragm and etc.
Yoshitake is not liable for any damage or loss caused by malfunction or defect of the product.
INTERNATIONAL DEPT.
955-5, Miyamae, Irukadeshinden, Komaki, Aichi, 485-0084, Japan
Phone: [phone] Fax: [phone]
E-mail: [e-mail]