Yoshitake REDMAN DD-2 Series User manual

■EPDT-251b■
MODEL DD-2 · DD-3 series
REDMAN
PRODUCT MANUAL .
Thank you very much for purchasing our solenoid valve. Please read this instruction manual thoroughly
before using the product, so that you may do so correctly and safely. Please carefully store this manual in a
handy place. The following safety symbols are used in this manual.
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. Usage of the Product·················································· 1
2. Features ·································································· 1
3. Specifications···························································· 1
4. Dimensions and Weight ·············································· 3
5. Operation································································· 3
6. Nominal Size Selection ·············································· 4
6.1 Nominal size selection chart ··································· 4
6.2 Calculation formula for Cv value ······························ 6
7. Installation ······························································ 6
7.1 Precaution for installation······································· 6
7.2 Piping example···················································· 8
7.3 Wiring method····················································· 8
8. Operating Procedure ················································· 9
8.1 Precaution for operating procedure ·························· 9
8.2 Test working ······················································· 9
9. Maintenance····························································· 9
9.1 Precaution for maintenance ·································· 10
9.2 Daily and periodic inspections ······························· 10
9.3 Troubleshooting··················································11
9.4 Disassembly and reassembly ································ 12
Warranty Information
DIRECT ACTING
SOLENOID VALVE
TM

1
■EPDT-251b■
1. Usage of the Product
The DD-2 and DD-3 series compact designed direct-acting solenoid valve has stainless steel body and
offers superior corrosion resistance. Because it can be applied to various fluids, it is widely used for water
supply/drainage systems in a house, plant facilities and automatic controllers for industrial use, etc.
2. Features
1. Superior corrosion resistance with stainless-steel-made trim parts.
2. Vertical or horizontal installation is possible.
3. Specifications
Caution
Please confirm that the indications on the product name plate coincide with the
specifications of the ordered product model before usage.
* In case they do not coincide, do not use the product and contact us.
Model DD-2 DD-2-8 DD-3 DD-3-8 DD-3-8N
Application
Steam, Cold and hot water, Air,
N2gas, CO2gas (dry), Ar gas,
Oil
Cold and hot water, Air, N2gas,
CO2gas (dry), Ar gas, Oil
Fluid viscosity 20 cSt or below
Working pressure 0-0.15 MPa 0-0.8 MPa 0-0.15 MPa 0-0.8 MPa
Orifice (mm) 9.5 4.0 9.5 4.0
Cv value 1.7 0.55 1.7 0.55
Allowable valve seat leakage
50 mL/min under standard
conditions No leakage at the pressure gauge
Max. temperature 175˚C 100˚C 90˚C
Installation posture
(*1)
Vertical or horizontal installation (*1)
(Within 90 degrees from upward position of the coil)
Operation Nomally closed
Material
Body Stainless steel
Plunger Stainless steel
Valve disc PTFE FKM
Connection JIS Rc screwed
Performance and specifications of coil
Rated voltage AC 100 / 200 V selective type AC 110 / 220 V selective type
50 / 60 Hz common
Allowable fluctuation Rated voltage ±10%
Rated current 0.42 / 0.21 A 0.38 / 0.19 A
Starting current 1.10 / 0.55 A 1.00 / 0.50 A
Insulation class Insulation class H
Protective structure Dust tight, Splash proof
Ingress protection code IP64 (JIS C0920)
Insulation resistance 50 MΩand more / 500 V megger
Withstand voltage test 1500 V / min
•DD-3-8N is approved product by Japan water works association (JWWA).
•Not available with pipe end core.
•Coil equipped with a terminal box (made of plastic) is also available.
•*1 : See Table 1.

2
■EPDT-251b■
Table 1. Installation posture
When using the solenoid valve to pilot piping of constant water level valve, select direct type or pilot type in
accordance with the instruction from constant water level valve manufacturer. If there is no instruction from
the manufacturer, we recommend selecting direct type DD-3-8N for the pilot piping below size 50A of
constant water level valve, and selecting pilot type DP-200-N for the pilot piping above size 65A of constant
water level valve.
Caution
(1)Please collate the attached nameplate with the specifications of the ordered model.
※If they are different, stop use and contact us.
(2)Make sure to confirm the specifications of constant water level valve before use.
※Constant water level valve or solenoid valve might not work properly depending on the types of
constant water level valve and solenoid valve or the piping conditions.

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■EPDT-251b■
4. Dimensions and Weight
(mm)
Nominal size d L H H1Weight (kg)
10A Rc 3/8 55 85.5 12 0.66
15A Rc 1/2 60 87.5 13 0.69
20A Rc 3/4 65 91 16.5 0.74
5. Operation
(1) Opening operation
When the coil is supplied with power, the plunger is pulled up and extends the spring upwardly, opening
the valve.
(2) Closing operation
When the coil is not supplied with power, the plunger drops down by its own empty weight and the spring
load, closing the valve.
Model ØD (mm)
DD-2 9.5
DD-3
DD-2-8 4.0
DD-3-8
(Example structural drawing: DD-3)
Plunger
Coil
Spring
Ø

4
■EPDT-251b■
6. Nominal Size Selection
6.1 Nominal size selection chart
■For water (Cv = 1)
First calculate pressure loss ∆P and then find flow rate V in the above chart. Secondly, multiply the flow
rate V by Cv value for each model.
[Example]
•Model: DD-3 (Cv value: 1.7)
•Inlet pressure (P1): 0.15 MPa
•Outlet pressure (P2): 0.05 MPa
Pressure loss is calculated as ∆P = P1- P2= 0.1 MPa. Then, find the flow rate V = 14 L/min as shown
by the dashed lines in the above chart. Next, multiply V = 14 L/min by the Cv value of 1.7.
Therefore: 14 L/min x 1.7 = 23.8 L/min
V: Flow rate (L/min)
∆P: Pressure loss (MPa)

5
■EPDT-251b■
■For steam (Cv = 1)
■For air (Cv = 1)
First find the flow rate (W for steam, Q for air), the intersection of inlet pressure P1and outlet pressure
P2. Secondly, multiply the flow rate Q or W by Cv value for each model.
[Example]
•Model: DD-2-8 (Cv value: 0.55)
•Fluid: Steam
•Inlet pressure (P1): 0.8 MPa
•Outlet pressure (P2): 0.5 MPa
Flow rate W is 92 kg/h, which is the intersection of P1= 0.8 MPa and P2= 0.5 MPa, as shown by the
dashed line. Next, multiply W = 92 kg/h by the Cv value of 0.55.
Therefore: 92 kg/h x 0.55 = 50.6 kg/h
Q
:
Flow rate (L/min)
P2: Outlet pressure (MPa)
W
:
Flow rate (kg/h)
P
2
:
Outlet pressure (MPa)

6
■EPDT-251b■
6.2 Calculation formula for Cv value
<For liquid>
P
GV365.0
Cv ∆ =
<For steam> <For air>
When
2
P
P1
2>When
2
P
P1
2>
)PP(P138
Wk
Cv
21 +∆
=)PP(P
G)t273(
2940
Q
Cv
21 +∆
+
=
When
2
P
P1
2≤When
2
P
P1
2≤
1P120
Wk
Cv =
1P2550
G)t273(Q
Cv + =
Cv: Cv value of each nominal size ∆P: P1– P2[MPa]
W: Max. steam flow rate [kg/h] K: 1 + 0.0013 × {superheated steam temp.[˚C]
Q: Max. gas flow rate [m3/h (standard condition)] – saturated steam temp. [˚C]}
V: Max. liquid flow rate [m3/h] G: Specific gravity (for gas, relative to air
P1: Inlet pressure [MPa∙A] /for liquid, relative to water)
P2: Outlet pressure [MPa∙A]
Cv value
Model Cv value
DD-2 1.7
DD-3
DD-2-8
0.55DD-3-8
DD-3-8N
7. Installation
7.1 Precaution for installation
Warning
Electric wiring work must be performed by a professional.
1. When there is a risk of having life hazard, harming a body or property by the malfunction of the
product, please install the safety device which operates interception, opening, warnings according
to each facility.
2. The product cannot be used as an emergency shutoff valve.
* The product is not designed as a safety valve such as an emergency shutoff valve. If the product
is applied to a system that needs safety measures, install other equipment besides the product to
ensure the safety.
3. The product is not explosion-proof. Do not use it in the area or ambience where explosive gases
accumulate.
* Doing so may cause fire.
4. Connect the cables only after confirming that no power is supplied.
* Failure to do so may cause an electric shock.
5. Connect the cables according to the instruction after confirming the rated voltage.
* Erroneous cable connection may cause an electric shock or fire.
6. Do not supply electric power to the coil while it is detached from the valve.
* Doing so may result in coil burnout or fire due to an overcurrent.

7
■EPDT-251b■
Caution
1. Vertical or horizontal installation is possible including the intermediates between vertical and horizontal
positions, however, do not install it upside-down.
* Failure to do so may result in an abnormal operation.
2. Before connecting piping to the product, remove foreign substances, dirt, etc. inside of the piping by flushing.
* Failure to do so may prevent the product from functioning correctly.
3. Match the fluid flow direction with the inlet and outlet of the product to ensure proper installation.
* Failure to do so may prevent the product from functioning correctly. (The valve will not close.)
4. Make sure to connect a strainer (80-100 mesh) to the inlet of the product.
* Failure to do so may prevent the product from functioning correctly.
5. Do not apply excessive load, torque or vibration to the product.
* Doing so may result in drastically shortened service life.
6. Secure the space required for disassembly or
removal at maintenance or inspections.
* Failure to do so prevents maintenance or
inspections being implemented.
7. Do not get the product wet.
* Failure to do so may result in an electric leakage.
8. Do not apply insulation to the solenoid coil.
* Doing so may cause an abnormal operation.
9. When the product is used in a facility which cannot
stop operating, install a bypass line with a bypass
stop valve.
* Use the bypass line while troubleshooting or
disassembling the product so that the facility can
keep operating.
10. Before piping, remove foreign substances and note that seal materials must not flow into the inside of
the product and piping.
* Foreign substances may cause valve seat leakage and malfunction.
11. When using the product under the conditions where the outlet pressure can accidentally become
higher than the inlet pressure, install a check valve at the outlet side to prevent backflow.
* Failure to do so may cause the backflow even during the solenoid valve is closed.
12. If the product is used in a steam line and negative pressure generates at its outlet side when it is
closed, install a vacuum breaker at the outlet side.
13. When using the product in a steam line, install a steam trap in the line.
* Failure to do so may cause condensate-induced problems.
14. When the product is used in a steam line, install it in such a way that avoids condensate accumulation
at the inlet side.
* Failure to do so may result in malfunction.
15. In case of a possible frozen line, take proper measures to remove water inside the piping or equip the
product with insulating materials.
* Freezing may damage the product. Do not insulate the coil.
16. When installing the product in the piping, do not grip and turn the coil or turn it with a tool.
* Doing so may damage the coil.
17. Do not pull the lead wires or hold the wire to lift and carry the product.
* Doing so may damage the coil.
18. Make the lead wires connected to the coil long enough so that the coil is easily dismounted or
replaced when required.
19. Band and support the lead wires connected to the coil to avoid their contact with workers or other
equipment and to avoid subjecting the wires to its own weight and tension.
20. If the product is in a closed piping condition, the fluid inside the pipe will expand in volume due to the
rise in fluid temperature and product may be damaged.
21. Sticky fluids may cause parts to stick and lead to malfunction
Minimum space
for dismounting coil
Required space for
replacement of product
150 mm or more
80 mm
or more

8
■EPDT-251b■
22. Avoid connection of dissimilar metal piping which will cause a galvanic potential difference because
the product or the parts may be corroded.
23. Select the product considering conditions of use such as operation frequency and durability.
7.2 Piping example
7.3 Wiring method
1. Wiring differs according to voltage, AC 100 V or
200 V. Wire the coil according to the instruction on
the label attached to the coil.
2. In order to prevent disconnection or insulation
failure, avoid unnecessarily pulling the lead
wires or subjecting them to excessive load while
wiring or use.
3. Use electric wires which have a core of 0.75 mm2
or more.
4. Use a fuse (3A) to protect the electric circuit.
Use a circuit protector as follows if the product is
used in a fuel supply system.
▪Rated voltage 100 V: 0.5 A circuit protector
▪Rated voltage 200 V: 0.3 A circuit protector
5. When using a terminal box, do not turn it to
change its posture.
* Doing so may cause disconnection or
insulation failure.
Bypass stop valve
Pressure gauge
Pressure
gauge
Stop
valve
Strainer
Pressure
gauge
DD-2
Solenoid valve
Stop
valve
Inlet Outlet
Power
Switch
Fuse
Circuit protector
Coil
AC 100 V
AC 200 V

9
■EPDT-251b■
8. Operating Procedure
8.1 Precaution for operating procedure
Warning
1. Do not touch the product with bare hands in case of high-temperature fluid.
* Doing so may result in burns.
* The coil becomes hot while it is continuously energized even in normal operation.
2. Before leading fluid, make sure that there is no danger when the fluid flows to the end of piping.
* The fluid outflow may cause physical damage.
* The hot fluid, if spouted out, may scald your skin.
Caution
1. When the product is newly installed or after the product is not used for a long time, perform test
working before starting operation.
2. Completely discharge the fluid inside of the product and line before leaving the product not
operated for a long time.
* Failure to do so may cause malfunction due to rust inside of the product and line, or result in
damaged due to freezing.
3. Sudden application of pressure to the product may open the valve instantly and cause leakage.
1. When the product is used with AC voltage, it may produce a buzzing sound depending on the
conditions of use.
8.2 Test working
Before performing test working, be sure to close the stop valves installed at both the inlet and outlet
sides of the product and remove foreign substances and scale completely by flushing the bypass line.
1. Before leading fluid into the product, switch it on and off a few times and confirm the sound caused
by the plunger when the coil turns on.
2. Fully open the stop valve at the outlet side.
3. With the product at open condition, open the stop valve at the inlet side gradually and confirm the
fluid flows to the end of piping.
4. Gradually close the stop valve at the outlet side, and confirm the fluid does not leak from
connection parts of the product or piping.
5. With the product at closed condition, fully open the stop valves at both the inlet and outlet side.
6. Switch on and off the product a few times to confirm it operates correctly.
7. With the product at closed condition, confirm there is no leakage at the end of the piping.
In case of any abnormal condition observed during test working, refer to “9.3 Troubleshooting” to take
proper measures and treatment.
9. Maintenance
Since most of the troubles with the product are caused by foreign substances inside of the piping, care
should be taken. Note that any repairs caused by foreign substances or scales are subject to a charge even
during the warranty period.

10
■EPDT-251b■
9.1 Precaution for maintenance
Warning
Disassembling and inspections must be performed by a professional or a valve manufacturer.
1. Confirm that no power is supplied before disassembling or maintenance.
* Failure to do so may cause an electric shock.
2. Completely discharge the pressure inside of the product, line and equipment before disassembling or
maintenance and cool down the product till it can be touched with bare hands in the case of
high-temperature fluid.
* Failure to do so may result in injury or burns due to residual pressure.
3. Do not supply electric power to the coil while it is detached from the valve.
* Doing so may result in coil burnout or fire due to an overcurrent.
Caution
1. Conduct daily/periodic inspections in order to maintain the optimal performance of the product.
2. Be careful not to drop the product at the time of disassembling, and put the disassembled parts on
soft cloth to avoid scratch and damage.
* Damage on the product or parts may cause malfunction and affect the optimal performance.
3. When replacing parts, make sure the replacement parts are supplied by Yoshitake. And do not
make any alteration to the product.
* Using any part supplied by other than Yoshitake or making any alteration may cause damage to
the product or may result in injury or scalds due to blow-off or malfunction.
4. In the event of failure, close the stop valves and turn off the power before inspection.
5. When any defect is found on the product during the daily/periodic inspections, be sure to contact a
professional and follow its instructions.
6. Be sure to replace the gasket with new one at the time of re-assembling.
* Failure to do so may result in external leakage.
7. After disassembling and re-assembling, perform test working before starting operation again.
8. While disassembling, the fluid leaks from inside of the product. Set a container to collect the fluid.
Completely discharge the fluid inside of the product prior to disassembly.
9.2 Daily and periodic inspections
Conduct daily and periodic inspection/replacement in order to maintain the optimal performance of
the product.
Daily inspection (to be conducted once every operational day.)
Item How to inspect Trouble and remedy
Working
conditions
Check that the valve
opens when switched
on, and closes when
switched off, using a
pressure gauge.
The valve does not
open.
(Fluid does not flow.)
See “9.3 Troubleshooting.”
The valve does not
close.
(Fluid flow does not stop.)
External
leakage
Inspect the product
visually.
See “9.3 Troubleshooting.”
Periodic inspection (to be conducted once every year.)
Item How to inspect Trouble and remedy
Seal seat
surfaces of the
body
Disassemble the product
and visually inspect
these parts.
If seal seat surface of the body is damaged, replace
the product.
Seal seat
surface and
sliding surface
of the plunger
Disassemble the product
and visually inspect
these parts.
If seal seat surface or sliding surface is damaged,
replace the plunger a’ssy.

11
■EPDT-251b■
9.3 Troubleshooting
Trouble Cause Remedy
Valve does not open.
(Fluid does not flow.)
1.
Strainer installed at the inlet side
of the product is clogged.
1.
Clean the strainer.
2.
Plunger a
’
ssy is stuck with
foreign substances in the piping.
2.
Disassemble the product and remove
foreign substances. Make sure that the
sliding action is smooth.
3.
Flui
d pressure exceeds the
specified working pressure.
3.
Adjust the fluid
pressure
to the specified
range or replace the product with a
proper model.
4.
Fluid viscosity exceeds 20 cSt.
4.
Adjust the fluid viscosity to the specified
range.
5.
No electric conduction.
(Trouble with electric circuit)
5.
Check the power supply and voltage.
6.
Coil is not wired properly for the
applied voltage.
6.
Wire the coil properly for the applied
voltage. If the trouble still exists, replace
the coil with new one.
7.
Voltage is fluctuating wi
dely.
7.
Adjust the electric circuit to regulate the
voltage within the allowable fluctuation.
8.
Coil specifications do not match
with the applied voltage.
8.
Replace the coil with new one proper for
the applied voltage.
9.
Coil is burnt out because of
overcurrent.
9.
Replace the coil with new one.
Make
sure that the applied voltage is within
the allowed range of voltage
fluctuation.
Valve does not close.
(Fluid does not stop
flowing.)
1.
Electricity is kept conducted.
1.
Check the power supply.
2.
Plunger a
’
ssy is stuck w
ith
foreign substances or get
damaged.
2.
Disassemble the product and remove
foreign substances. Replace the parts
with new ones if any damage is
observed.
3.
Plunger a
’
ssy is stuck with
foreign substances in the piping.
3.
Disassemble the product and remove
foreign substances. Make sure that the
sliding action is smooth.
4.
Inlet/outlet of the product is
installed oppositely to the fluid
flow.
4.
Reinstall the product correctly.
5.
Bypass stop valve is kept open.
5.
Close the bypass stop valve.
The product vibrates.
1.
The
re is a constricted part of
piping just in front of the inlet of
the product.
1.
Install the product in another
configuration or change the position of
the constricted part.
2.
Gas is mixed in the liquid.
(If the applied fluid is liquid.)
2.
Change the piping including equipment,
or install the product in another position.
Abnormal sound is
detected.
1.
H
e
xagon nut clamping the coil is
loosened.
1.
Retighten the nut with the specified
torque.
2.
Foreign substances exist on the
internal surface of the pipe or at
the top surface of plunger a’ssy.
2.
Disassemble the product and remove the
foreign substances.
3.
Fluid pressure exceeds the
specified working pressure.
3.
Adjust the fluid pressure to the specified
range or replace the product with a
proper model.
4.
V
o
ltage applied to the coil is not
proper.
4.
Check the voltage.
External leakage is
observed.
1.
Cover gasket is damaged.
1.
Replace it with a new one.
2.
Pipe is loosened.
2.
Retighten it with the specified torque.

12
■EPDT-251b■
9.4 Disassembly and reassembly (See “Exploded drawing” below.)
Warning
1. Confirm that no power is supplied before disassembling.
* Failure to do so may cause an electric shock.
2. Completely discharge the pressure inside of the product, line and equipment before disassembling or
maintenance, and cool down the product till it can be touched with bare hands in the case of
high-temperature fluid.
* Failure to do so may result in injury or burns due to residual pressure.
■Exploded drawing
(1) Loosen Hexagon nut (M14) and
remove Tooth lock washer, Plain
washer, Name plate and O-ring
(Small), and then dismount Coil.
(2) Remove Pipe with a spanner (32
mm width across flat).
(3) Remove Plunger.
(4) Reassemble the product in the
reverse order of disassembling.
(5) Tighten Pipe with the torque of 50
N▪m, and Hexagon nut with that of
15 N▪m.
The parts name shown in the rectangle boxes
are available as consumable supply.
Pipe
Hexagon nut
Tooth lock washer
Plain washer
Name plate
O-ring (Small)
Coil
O-ring (Large)
Gasket
Spring
Plunger (Disc)
Body

PDD-046f
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.