Yoshitake SU-50H User manual

■ EPDT-183b ■
Models SU-50/50H/50S
Strainer
Instruction Manual
Thank you for purchasing the Yoshitake product. It is important that you carefully read through
this manual before using it. Keep this manual in convenient place so you can refer to it as you
need.
－－－－ Please note the following caution icons and conventions used in this manual. －－－－－


 Warning
This symbol indicates a potentially hazardous situation which, if not
avoided, could result in death or serious injury.


 Caution
Indicates a potentially hazardous situation which, if not avoided,
may result in minor or moderate injury. It is also used to alert against
property damage.
Contents
Purpose ······························································ 1
1. Specifications ·················································· 1
2. Structure,Dimensions and Weight ······················ 1
3. Selection of nominal size ······························ 2
4. Installation
4.1 Example of piping ······································· 3
4.2 Warning and cautions upon installation········ 3
5. Operation
5.1 Warning and caution upon operation ··········· 4
6. Maintenance
6.1 Troubleshooting ·········································· 4
6.2 Warning and caution upon inspection················ 4
6.3 Removal of the screen ································ 5
6.4 Assembly after disassembly ························ 6
6.5 Exploded drawing ·········································· 7
After Sales Service

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Purpose
This product is mainly used for removing dust from cooling and industrial water.
1. Specifications
Model SU-50H SU-50 SU-50S
Nominal Size 50A, 65A, 80A, 100A, 150A
Applicable Fluids Cold and hot water,Oil,Other non-dangerous fluids
Maximum Pressure 2.0 MPa 1.0 MPa
Applicable
Temperature 80
℃
Connection JIS 20KRF Flange JIS 10KFF Flange
Body Ductile Cast Iron
Ma teri al
Screen Stainless Steel
Perforation
φ 6 － 1.42 holes/cm
2
Screen Mesh Standard 60 mesh
※ We can customize 20 ～ 250 mesh net strainers upon request.
 Cautions
(1) Please confirm that the indications on the product plate coincide with the
specifications of the ordered model. Also confirm that the conditions for usage
coincide with the Specifications (in the chart above).
※ In case they do not coincide, do not use the product and contact us.
2. Structure, Dimensions, and Weight
Fig.1 Model SU-50 ･ 50H Fig.2 Models SU-50S
Chart 1 Name of Parts
No. Part No. Part No. Part
１
Body
７
Bolts
13
Spring Washers
２
Cover
８
O-Ring
14
Plate
３
Arms
９
Plug
４
Screen
10
Plug
５
Stud Bolts
11
Screws
６
Eye Nuts
12
Plain Washers
Alien matter contained in the
fluid entered from the strainer
inlet is removed by screen ④ .

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Chart 2 Dimensions & Weight (mm)
H
２
Weight (kg)
Nominal
Size
L H
１
SU-50 ･ 50H
SU-50S
ds ls d do
SU-50 ･ 50H SU-50S
50A 243 166 88 140 64.5 108 R1/4 R3/4 13.0 13.0
65A 254 166 88 140 64.5 108 R1/4 R3/4 15.0 15.0
80A 300 204 98 163 77 140 R3/8 R1 20.0 20.0
100A 315 230 103 166.5 90 160 R3/8 R1 29.0 28.0
150A 455 385 137 211 140 270 R3/8 R1-1/2 73.5 72.0
3. Selection of nominal size
The nominal size of the strainer should be the same as that for the piping. (Nominal size of piping ＝
Nominal size of strainer). Please note that if the nominal size of the strainer is smaller than that for the
piping, the pressure loss of the strainer may grow, resulting in failure to maintain the required pressure
at the inlet of the strainer. （ See Fig.3: Loss of Pressure. ）
The Japan Industrial Standards (JIS) designates the standard flow velocity for piping by type and
features of the fluid and pipe size. Please refer to this in selecting the appropriate nominal size of the
strainer.
Chart 3 Standard flow velocity by fluid
Fluid Standard flow speed
Water & Oil 2 m/s (2
～ 4)
※ The standard flow velocity in this chart have been calculated based on the requirements in JIS F
7101(Pipes of Ship’s Machinery: Standard Velocity of Flow, 1999 ).
Screen: φ 6-14.2strain pipes /cm
2
Fig. 3 Loss of Pressure （ Fluid ： Water ）

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4. Installation
4.1 Example of piping
Fig. ４ Example of Piping
(1) Installation of pressure gauges at either end of the strainer will enable you to tell the clogging
condition of the strainer by looking at the loss of pressure.
(2) Upon installation, make sure that cover ② comes at the top.
(3) If you are using the strainer outdoors, please coat the strainer for rust prevention.
4.2 Warning and cautions upon installation
 Warning
(1) As this product is heavy, please use a hanging device to securely support the product upon
connection to the piping. For hanging Models SU-50S and , you may use eye nuts ⑥ . (Please
refer to Chart 2 for the weight of each product.)
※ Please note that falling of the product can result in injuries.
 Cautions
(1) Please confirm that the direction of the fluid flow and the arrow on the product coincide
before installing the product.
※ The product will not function if it is installed in the wrong direction.
(2) Please support the piping and fix on the product securely.
※ The product may deform from too much stress from the piping.
(3) Upon installation, please secure sufficient space as shown in Fig. 5 and 6 for maintenance
and inspection (including cleaning of the screen).
※ You will be unable to maintain (including cleaning of the screen) and inspect the product if
there is not enough space.
(4) Upon piping, please make sure that unnatural force, bending, or vibrations will not be
transmitted to the product.
※ Inadequate piping can result in leakages.
(5) Please make sure that the connections with the piping are secure.
※ Inadequate connections can result in physical damages due to fluid outflow caused by
vibrations and other reasons.
※ Inadequate connections can result in fluid outflow.
Fig. 5 Space required above the
strainer for removal of the screen
Fig. ６ Space required beside the strainer for
removal of the screen (for SU-50S only ）

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Chart 4 Dimensions required for removal of the screen
Nominal Size
Ａ (mm) Ｂ (mm)
50, 65A 300 180
80A 350 210
100A 400 220
150A 600 280
5. Operation
5.1 Warning and caution upon operation
 Warning
（ 1 ） Please make sure that there is no danger at the pipe end before pouring the fluid.
※ You may get scalded in case hot fluid spouts out.
※ Physical damage may occur from fluid outflow.
 Caution
（ 1 ） This product should be used only when the maximum pressure loss is 0.1MPa or less. Please
also clean the screen regularly.
※ Neglect can result in damage of the screen.
6. Maintenance
6.1 Troubleshooting
Condition of
failure
Causes Measures and treatment
Fluid does not flow.
1. Screen ④ is clogged.
2. The stop valves at either end of the
strainer are closed.
1. Disassemble the strainer and clean screen
④ .
2. Open the stop valve(s).
Loss of pressure is
great.
1. Screen ④ is clogged.
2. The pressure gauge is out of order.
3. The nominal size is too small for
the actual flow volume.
1. Disassemble the strainer and clean screen
④ .
2. Exchange the pressure gauge.
3. Use a strainer with a larger nominal size,.
（ Refer to Fig. ３ : Loss of Pressure ）
Alien matter is not
removed.
1.Screen ④ is damaged. 1.Disassemble the strainer and exchange
screen ④ . In case quick valves are installed
at either end of the strainer, do not open
them immediately since this may result in
damage of the water hammer.
Cover ② cannot
be removed upon
exchange of
screen.
1.The inside of the product is
vacuum.
2.Cover ② and body ① are stuck
together.
1.Break the vacuum inside the pipe and
remove cover ② .
2. Refer to 6.3 Removal of the screen.
Outer leakage
occurs.
1.O-ring ⑧ is damaged.
2.Cover ② is not assembled
properly.
1. Install a new O-ring.
2.Assemble properly by referring to 6.4
Assembly after disassembly.
6.2 Warning and caution upon inspection
 Warning
（ 1 ） Remove all pressure within the product, piping, and equipment before disassembly and
inspection.
In case of hot fluid, cool down the product body so you can touch it with your bare hand before
disassembly and inspection.
※ Residual pressure in the product or piping can result in injuries or scalding.

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 Caution
（ 1 ） Please clean the screen regularly since if waste and scales clog the strainer, the area for fluid
flow decreases, thereby obstructing smooth flow.
※ Neglect will result in too much pressure loss leading to damage of the screen and piping system.
6.3 Removal of the screen
Check the pressure gauge so that there is no pressure inside the product.
● Model SU-50 ･ 50H
(1) Remove bolts ⑦ .
(2) Remove cover ② . In case you cannot remove the cover, screw in M8 bolts in the two holes on
the cover until the cover comes up. (See Fig. 7), and then remove the cover. Remove the M8
bolts after removing the cover.
(3) Remove screen ④ from the body ① , and clean with compressed air and cleaning agents.
Fig. ７ Removal of cover for Model SU-50 ･ 50H （ Above diagram ）
● Models SU-50S
(1) Loosen eye nuts ⑥ with a screw driver.
(2) Move arm ③ away from cover ② so that it does not touch it. (See Fig. 8 ) In case of 150A,
move both arms away.
(3) Remove cover ② . If you cannot remove the cover, move one of the screws ⑪ on the cover to
the other side, and screw in the two screws evenly until the cover comes up. (See Fig. 8 ) Return
the screws to their original positions after removing the cover
(4) Remove screen ④ from the body ① , and clean with compressed air and cleaning agents.
Fig. 8 Removal of covers for Models SU-50S （ Above diagram ）

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6.4 Assembly after disassembly
(1) Clean body ① and the portions on cover ② that come in contact with the O-ring.
(2) Assemble screen ④ onto the cleaned body.
(3) Apply silicone grease onto a new O-ring ⑧ and assemble it onto the slot on the cover ② ,
then assemble the cover onto the body.
(4-1) For Model SU-50 ･ 50H, tighten bolts ⑦ .
(4-2) For Models SU-50S, return arm ③ to the position of stud bolts , then tighten the
eye nuts ⑥ .(Please confirm that the plain washers ⑫ and spring washers ⑬ have
been fit onto the arm before this.)
 Cautions
(1) Clean body ① and the portions on cover ② that come in contact with the O-ring ⑧ .
※ Insufficient cleaning can result in outer leakages.
(2) Please take care not to damage the O-ring ⑧ upon assembly onto the cover ② .
※ Damage can result in outer leakages.
(3) Use a new O-ring ⑧ , and apply silicone grease onto it.
※ A used O-ring may break and result in outer leakages. It may also become impossible to
remove the cover.
(4) In case screen ④ is deformed or damaged, exchange it to a new one.
※ The product will not function with a deformed or damaged screen.
(5) Securely assemble each part upon assembly.
※ Insecure assembly may result in deformation or damage to the parts.
(6) Upon assembly of Models SU-50S, confirm that the plain washers ⑫ and spring washers ⑬
have been fit onto the arm. (See Fig. 8.)
※ Neglect can cause deformation of the cover and arm resulting in outer leakages or other
damages.
(7) Upon assembly, make sure that bolts ⑦ and eye nuts ⑥ are tightened evenly on either side.
Please be careful not to tighten the eye nuts too tightly. （ Refer to the torque values in Chart 3. ）
※ Neglect can cause deformation of the cover and arm resulting in outer leakages or other
damages.
Fig.9 Position for parts on Models SU-50S
※ Tighten the eye nuts till they come in close contact with the spring washers.
(Please be careful not to tighten the eye nuts too tightly.)
Chart 5 Tightening torque for the eye nuts (recommended values)
Nominal size Tightening torque
（ N ･ m ）
50, 65A 20
80 ～ 150A 30

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6.5 Exploded drawing
Model SU-50S
Model SU-50 ･ 50H
Fig.10 Exploded drawing
※ The parts framed rectangle are consumable items. The timing of replacement are based
on below chart.
No. Name of parts Durable (Rough standard)
⑧
O-Ring When the cover
② is replaced or 3 years.
④
Screen 5 years