Yoshitake SU-20H User manual

■PDT－169a■
MODEL SU-20H
STRAINER
Installation & Operation Manual
We thank you very much for using the Yoshitake Products. In order to put in use our product
correctly and safely, please make sure to read this manual thoroughly prior to the installation.
Also we kindly request you to keep this manual with care at your hand.
The following safety symbols are used in this manual.
Warning
Indicates that mishandling this product might cause fatal or
serious bodily injury.
Caution
Indicates that mishandling this product might cause bodily
injury or material damage.
Contents
Overview ·····························································1
1. Features ··························································1
2. Specifications ····················································1
3. Dimensions and Weights·······································1
4. Operation ·························································2
5. Pressure loss
5.1. Selection of pipe diameter ··································3
5.2. Pressure loss diagram·······································3
6. Installation
6.1. Example of piping ···········································4
6.2. Precautions during installation and inspection·········4
7. Operating Procedure
7.1. Precautions during operation and inspection ···········5
8. Maintenance Procedure
8.1. Troubleshooting ··············································5
8.2. Precautions during maintenance and inspection ·······5
8.3. Disassembly Procedure ·····································6
8.4. Assembly Procedure·········································6
8.5. Precautions during change the screen····················6
8.6. Exploded drawing············································7
After Sale Service

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Overview
Used in wide range of purpose as dust removing from water and oil. Mainly used for cooling
water and water for industrial use.
1. Features
（1）A large filtration area is enlarged in consideration of the decline in flow rate capacity because
of the clog.
（2）In view of safety at the time of a setup, the underselling Eyebolt and the leg performed as an
anchor stop are equipped.
2. Specifications
Application
Water , Oil
Nominal Size
200Ａ
Connection
JIS 10KFF flanges
JIS 20KRF flanges
BS4504 PN16 flanges
Maximum Pressure
1.0 MPa
2.0 MPa
1.6 MPa
Temperature range
5～80℃
Material
Body
Ductile Cast Iron
Screen
Stainless Steel
Standard
Screen
Perforated plate
φ6 －9P
φ2.5 －4 P
Element
60 mesh
―
※Upon your request, we can manufacture the types with 20 to 100 mesh screens.
（Perforated plate of no Element isφ2.5 －4P）
Caution
(1) Please collate with attached nameplate and specification of ordered model.
※Please consult factory in case they do not match each other.
3. Dimensions and Weights
(mm)
Flanges
L
Screen
Weights
(kg)
ds
ls
JIS 10KFF
640
200
400
167
JIS 20KRF
640
200
400
170
BS4504 PN16
640
200
400
170
Figure-1.Dimensions and Weights

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4. Operation
No.
Parts Name
No.
Parts Name
The screen③removes dust, scale and
other foreign matter out of the fluid
flown from inlet port of strainer.
（Figure-2.）
1
Body
8
Plug
2
Cover
9
O Ring
3
Screen
10
Bolt
4
Bolt
11
Eyebolt
5
Lock Nut
12
Name Plate
7
Plug
Figure-2. Operation

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5. Pressure loss
To use the strainer most effectively and to fulfill the required criteria thoroughly, please take
the following points into consideration.
5.1. Selection of pipe diameter
When selecting the nominal diameter of pipe, it is necessary to consider the kind of fluid, its
maximum flow rate, allowable pressure loss and piping installation cost among others. Smaller
diameter of pipe makes the lower piping cost, but the pressure loss will be increased and there
are possibilities of abrasion of pipe, noise and vibration due to turbulent flow. If the pipe
diameter is too large, not only the piping cost but also the heat loss will be increased.
As one method of selection of suitable pipe diameter, Japan Industrial Standard (JIS) sets the
standard flow velocity depends on the relative kind of fluid, its characteristic and pipe diameter,
to which please refer.
≪Standard flow velocity of fluid≫
Fluid
Standard flow velocity
Water ,Oil
2 m/s(2～4)
※This list shows the standard flow velocity of relative fluid, which made in reference with the
standard of JIS F7101(Ship’s Machinery Standard Flow Velocity in Pipes).
5.2.Pressure loss diagram
Perforated plate
：
φ6 －9P Element : 60 mesh
Fluid
：
Water
V flow rate （l/min）
ΔP Pressure loss （MPa）
Figure-3.Pressure loss diagram

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6. Installation
6.1. Example of piping
Figure-4. Example of piping
(1) Installing pressure gauges at inlet and outlet side may help to detect the clogging up of
the screen.
(2) Install the strainer perpendicularly to horizontal lines.
6.2. Precautions during installation and inspection
Warning
(1) As this product is rather heavy in weight, please secure it with lifting devices for
installation on piping. As to the weight of product, please refer to “3. Dimensions and
Weights”.
※Falling the strainer may cause the injury of personnel.
Caution
(1) When installing, confirm if the direction of fluid flow matches with inlet and outlet port of
the product respectively.
※If installed in opposite direction, it will not function as designed.
(2) Carry out the securing of pipes and the product properly.
※Excessive piping stress may cause the deformation of strainer.
(3) When installing, reserve the space shown in Figure-5 for the maintenance and checking
(cleaning of the screen).
※It will be impossible to carry out the maintenance and inspection (cleaning of the screen).
(4) Do not apply excessive load, torque or vibration to the valve.
※The fluid may leak from strainer.
(5) Carry out the connection with pipes properly.
※Improper piping connection may cause the leakage of fluid due to vibration or other
cause. With some kind of fluid, there will be a danger of personnel being scalded.
※The fluid flowed out of pipe end may cause some material damages.
Figure-5.Space of piping

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7. Operating Procedure
7.1.Precautions during operation and inspection
Warning
(1) Prior to letting the fluid run in the system, make sure that there is no danger when
the fluid flows out of pipe end.
※In case the fluid of high temperature flows out of pipe end, there will be a danger of
personnel being scalded.
※The fluid flowed out of pipe end may cause some material damages.
Caution
(1) Use the strainer in condition of maximum pressure loss of below 0.1MPa. Also keep
cleaning the screen periodically.
※The screen may be damaged.
8. Maintenance Procedure
8.1.Troubleshooting
Trouble condition
Cause of trouble
Countermeasure and remedy
No fluid flows.
1. Screen③is clogged up.
1. Disassemble and clean the
screen③.
2. Stop valves at inlet and/or
outlet side are shut.
2. Open stops valves.
Pressure loss is excessive.
1. Screen③is clogged up.
1. Disassemble and clean the
screen③.
2. Pressure gauge is damaged.
2. Renew the Pressure gauge.
8.2.Precautions during maintenance and inspection
Warning
(1) Completely discharge internal pressure from the strainer, lines, and equipment,
and cool the strainer down to a level where you can touch it with bare hands
before disassembly and inspection.
※Failure to do so may result in injury or burns due to residual pressure or spillage
around the product.
(2) In case the high temperature of fluid is applied, keep the bare hand off the strainer.
※It may cause the personnel being scalded.
(3) Since the screen is heavy in weight, when extracting the screen from the body, make
sure to secure it properly with lifting devices.
※The screen fallen down may cause the injury.
Caution
(1) In case screen is lodged in foreign matter, scales, etc, liquid passing area will be
decreased and fluid will not flow smoothly. Please clean up a screen periodically.
※If remain untouched, differential pressure will become excessive and it leads to breakage
of a screen and a bad influence on a piping system.

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8.3. Disassembly Procedure
(1) After confirming that the remaining pressure is relieved from the strainer, remove the
bolts⑩from the cover②, and remove the cover②from the body①. Extract the screen③
from the body①and clean it with compressed air or cleanser.
Caution
(2) Don’t loose bolts④and lock Nut⑤, because they are adjusted height that the cover②
clamp the screen③.
※In case clamping the screen don’t have enough force, gap between body①and screen③
may affect the original performance, or Screen may be deformed or damaged.
※In case clamping the screen is too force, Screen may be deformed or damaged.
8.4. Assembly Procedure
(1) After cleaning down the sealing surface of body①and cover②, Install the clean screen③
in body①. Apply the silicon grease to the O-ring⑨, after confirm whether there are any
flaw on the O-ring⑨. Install the cover②.
Caution
(2) When re-assembling, fix the relative parts properly.
※Parts may be deformed or damaged.
(3) Tighten the bolts evenly on each bolt in turn of diagonal position.
※The fluid may leak from strainer. If the fluid is of high temperature, the leakage may
cause being scalded.
(4) Cleaning down the sealing surface of body①and cover②
※The fluid may leak from strainer. If the fluid is of high temperature, the leakage may
cause being scalded.
(5) Apply the silicon grease to the O-ring.
※O-ring may be deformed or damaged.
(6) In case the O-ring is damaged, replaces the O-ring to new one and applies the silicon
grease to the O-ring.
※IF the O-ring is damaged, the fluid may leak from strainer. If the fluid is of high
temperature, the leakage may cause being scalded.
8.5. Precautions during change the screen
Caution
(1)Indicates that changing the screen, adjust height of bolts④that the cover②clamp the
screen③.and tight the bolts④and lock Nut⑤.(Refer to “figure-6 Adjusting height of
bolts”.)
※In case clamping the screen don’t have enough force, gap between body①and screen③
may affect the original performance, or Screen may be deformed or damaged.
※In case clamping the screen is too force, Screen may be deformed or damaged.
Figure-6.Adjusting height of bolts

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8.6. Exploded drawing
※Part names shown in boxes are consumable items.
Figure-7.Exploded drawing

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.