Yoshitake SU-20, SU-20S, and SU-20C are ductile cast iron strainers designed for removing dust and scale from cold and hot water, oil, and other non-dangerous fluids. They feature a large filtration area to minimize pressure loss and ensure sufficient flow. The series includes the standard SU-20, the SU-20S with a one-touch cover for easy maintenance, and the SU-20C which is coated with Nylon 11 for superior corrosion resistance.

Features

1. The largest possible filtration area in view of flow rate decrease caused by clogging.
2. Disassembling and cleaning are easy due to a simply structured cover that can be fixed and removed simply by tightening or unfastening a single bolt (SU-20S).
3. Excellent corrosion resistance due to the inner and outer surface coated with Nylon 11 (SU-20C).

Specifications

Model SU-20 / SU-20C

Specification	Value
Application	Cold and hot water, Oil (Kerosine, A and B heavy oil), Other non-dangerous fluids
Nominal size	20A-150A
Maximum pressure	1.0 MPa
Maximum temperature	220°C (SU-20C: 60°C)
Body Material	Ductile cast iron
Screen Material	Stainless steel
Screen Perforation	$\phi$ 6-9P ($\phi$ 6-1.42 holes/cm²)
Screen Mesh	Standard 60 mesh
Connection	JIS 10K FF flanged

• Available with rust-proof (SU-20).
• The shape of the cap is different depending on the size. 20A-65A: Square, 80A: Hexagon, 100A-125A: Octagon, 150A: Decagon.
• Screens from 20 to 250 mesh are available.

Model SU-20S

Specification	20A-100A	125A	150A
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Maximum pressure	1.0 MPa	0.7 MPa	0.5 MPa
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• Available with 20 to 150 mesh screen. Please contact us for 150 mesh or more.
• Available with O-ring FKM (Viton).

Structure, Dimensions and Weight

Nominal Size	L	H1	H2	H3	A	B	ds	ls	Plug	Weight (kg) SU-20/10	Weight (kg) SU-20S/10S
20A	175	97.5	54	107.5	87	131	40	70	R 3/8	5.0	5.6
25A	175	97.5	54	107.5	87	131	40	70	R 3/8	6.1	6.7
32A	230	146	67.5	151	115	179	64.5	108	R 3/4	11.1	12.5
40A	230	146	67.5	151	115	179	64.5	108	R 3/4	11.8	13.2
50A	230	156	69.5	153	115	179	64.5	120	R 3/4	12.4	13.8
65A	290	182	70	153.5	134	208	77	140	R 1	18.7	20.8
80A	300	197.5	88.5	189	185	249	90	160	R 1	23.8	27.1
100A	365	262	118.5	253	220	334	120	210	R 1-1/4	41.3	48.6
125A	425	340.5	134.5	269	248	362	140	270	R 1-1/2	61.4	69.4
150A	505	378	158.5	293	305	414	175	300	R 2	98.4	108.3

Selection of Nominal Size

The nominal size of the strainer should be the same as that for the piping. 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.

Standard flow velocity by fluid

Fluid	Standard flow speed
Water & Oil	2 m/s (2~4)

Installation

Example of Piping

Warning

As this product is heavy, please use a hanging device to securely support the product upon connection to the piping. 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.
2. Please support the piping and fix on the product securely.
3. Upon installation, please secure sufficient space for maintenance and inspection (including cleaning of the screen).
4. Upon piping, please make sure that unnatural force, bending, or vibrations will not be transmitted to the product.
5. Please make sure that the connections with the piping are secure.

Operation

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.

Caution

This product should be used only when the maximum pressure loss is 0.1MPa or less. Please also clean the screen regularly. Installation of pressure gauges at either end of the strainer enables to check the clogging of the strainer.

Maintenance

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 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 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 screen.
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 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 nut (for SU-20, 20C) or the bolt (for SU-20S), cover and screen. Clean up the screen by air or detergent.

Warning

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.

Exploded Drawing

Note: The structure for SU-20S and 20C is different. Gaskets are consumable parts and should be replaced at disassembly.