The Yoshitake SU-20S is a U-type strainer designed for cold and hot water, oil, and other non-dangerous fluids. It features a large filtering area to maintain sufficient flow even as debris accumulates. The strainer cover is easily removable by taking off a single bolt, allowing for simple disassembly and cleaning.

Specifications

Specification	Detail
Application	Cold and hot water, Oil, Oil (kerosine, A, B heavy oil), Other non-dangerous fluids
Nominal size	20A-150A
Maximum pressure	1.0 MPa (20A-100A), 0.7 MPa (125A), 0.5 MPa (150A)
Maximum temperature	80°C
Body Material	Ductile cast iron
O-ring Material	NBR
Screen Material	Stainless steel
Screen Perforation	φ6-9P (φ6-1.42 holes/cm2)
Screen Mesh	Standard 60 mesh
Connection	JIS 10K FF flanged

• Available with 20 to 150 mesh screen. Please contact us for 150 mesh or more.
• Available with O-ring FKM (Viton).
• The shape of the cap is different depending on the size: 20A-65A: Square, 80A: Hexagon, 100A-125A: Octagon, 150A: Decagon.

Structure

No.	Parts Name	Material
1	Body	Ductile Cast Iron
2	Cover	Ductile Cast Iron
3	Screen	Stainless Steel
4	Plug	Carbon Steel or Malleable Cast Iron
5	O-Ring	NBR
6	Arm	Ductile Cast Iron
7	Bolts	Steel

Dimensions and Weights

Nominal Size	L	H1	H2	H3	A	B	ds	ls	Plug	Weight (kg)
20A	175	97.5	54	107.5	87	131	40	70	R3/8	5.6
25A	175	97.5	54	107.5	87	131	40	70	R3/8	6.7
32A	230	146	67.5	151	115	179	64.5	108	R3/4	12.5
40A	230	146	67.5	151	115	179	64.5	108	R3/4	12.5
50A	230	146	67.5	151	115	179	64.5	108	R3/4	13.5
65A	260	165	77.5	174	134	204	76	120	R3/4	19.5
80A	300	185	102.5	202.5	152	237	93.5	138	R3/4	25
100A	350	225	115	240.5	181	283	117.5	175	R1	39.5
125A	400	270	125	290	212	337	143	200	R1	58.5
150A	450	300	145	321	240	382	169	220	R1	80.5

Pressure Loss Chart (For Water)

Screen: Perforation = φ 6-9P, Mesh = 60 mesh

Selection of Nominal Size

The nominal size of the strainer should be the same as that for the piping. If the nominal size of the strainer is smaller than the piping, the pressure loss may grow, resulting in a failure to maintain the required pressure at the inlet of the strainer.

Installation

Warning

As this product is heavy, please use a hanging device to securely support the product upon connection to the piping.

Cautions

• Please confirm that the direction of the fluid flow and the arrow on the product coincide before installing the product.
• Please support the piping and fix the product securely.
• Upon piping, please make sure that unnatural force, bending, or vibrations will not be transmitted to the product.
• Please make sure that the connections with the piping are secure. Inadequate connections can result in fluid outflow.

Upon installation, please secure sufficient space for maintenance and inspection (including cleaning of the screen).

Size	Space H (mm)
20A-25A	200
32A-65A	300
80A	400
100A	500
125A	600
150A	700

Operation and Maintenance

Warning

• 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.
• 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.

Caution

• This product should be used only when the maximum pressure loss is 0.1MPa or less.
• Please clean the screen regularly since waste and scales clogging the strainer decreases the area for fluid flow, resulting in too much pressure loss and damage to the screen and piping system.
• Do not take the screen off by force if the brim of the screen is stuck, as this causes deformation.
• Installation of pressure gauges at either end of the strainer enables checking for clogging.

Troubleshooting

Condition of failure	Causes	Measures and treatment
Fluid does not flow	1. Screen is clogged. 2. The stop valves at either end of the strainer are closed.	1. Disassemble the strainer and clean the screen. 2. Open the stop valve(s).
Loss of pressure is great	1. Screen 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 the screen. 2. Exchange the pressure gauge. 3. Use a strainer with a larger nominal size.
Alien matter is not removed	1. Screen is damaged.	1. Disassemble the strainer and exchange the screen. In case quick valves are installed, do not open them immediately.
Cover cannot be removed upon exchange of screen	1. The inside of the product is vacuum. 2. Cover and body are stuck together.	1. Break the vacuum inside the pipe and remove the cover.
Outer leakage occurs	1. O-ring is damaged. 2. Cover is not assembled properly.	1. Install a new O-ring. 2. Assemble properly.

Disassemble and Cleaning

After checking the pressure gauge so that there is no pressure inside the product, remove the bolt for the arm, the cover, and the screen. Clean up the screen by air or detergent.

Assembly

1. Clean up the body and the sealing portion of the O-ring, and install a new O-ring. Apply grease onto the O-ring.
2. Install the cleaned screen into the body, close the cover, and tighten the bolt for the arm.

Caution

• Insufficient cleaning of the sealing portion can result in outer leakage.
• Use a new gasket/O-ring at assembly. A used one may result in outer leakage.
• There is a possibility of damaging the O-ring in case grease is not applied onto it.

(Note: The structure for SU-20 and 20C is different. The gasket/O-ring should be replaced at disassembly.)