Yoshitake SU-50S is a quick-open strainer designed for removing dust from cooling and industrial water. It features a ductile cast iron body and a carbon steel cover with an O-ring for superior sealing, making screen disassembly and cleaning easy. The strainer is suitable for water and oil applications with a maximum pressure of 1.0 MPa and a maximum temperature of 80℃. Related models SU-50H (up to 2.0 MPa) and SU-50SS (with stainless steel cover and epoxy coating for flushing water) share the same product family.

Features

• Excellent Sealing: Cover with O-ring ensures superior sealing.
• Easy Maintenance: Quick-open type allows for easy disassembly and screen cleaning.
• Rustproof Screen: Standard 316 stainless steel screen ensures excellent rustproof performance.
• High Pressure Option: Ductile cast iron body allows a maximum pressure of up to 2.0 MPa for the SU-50H variant.

Specifications

Model	SU-50H	SU-50S	SU-50SS
Application	Water, Oil	Water, Oil, Flushing water
Nominal size	50A, 65A, 80A, 100A, 150A
Maximum pressure	2.0 MPa	1.0 MPa	1.0 MPa
Maximum temperature	80℃
Body Material	Ductile cast iron	Ductile cast iron	Ductile cast iron with Epoxy Coating
Cover Material	Ductile cast iron	Carbon steel	Stainless steel
O-ring	NBR
Screen Material	Stainless steel
Screen Perforation	φ6-9P
Screen Mesh	Standard 60 mesh
Connection	JIS 20KRF	JIS 10KFF or BSEN PN16	JIS 10KFF or BSEN PN16

• Available with Epoxy Coating for flushing water.
• Available with 20 to 100 mesh screen (customizable 20-250 mesh upon request).

Structure, Dimensions, and Weight

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 the screen.

Dimensions (mm) and Weights (kg)

Nominal Size	L	H1 (SU-50S)	H2 (SU-50S, 50SS)	ds	ls	d	do	Weight (kg)
50A	243	166	144	64.5	108	R1/4	R3/4	13.0
65A	254	166	144	64.5	108	R1/4	R3/4	15.0
80A	300	204	165.5	77	140	R3/8	R1	20.0
100A	315	230	169	90	160	R3/8	R1	28.0
150A	455	314	224	125	230	R1/2	R1 1/2	68.0

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 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	2m/s (2~4)

Installation

Example of Piping

• 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.
• Upon installation, make sure that the cover comes at the top.

WARNING

• 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, you may use eye nuts.
• Confirm that the direction of the fluid flow and the arrow on the product coincide before installing.
• Support the piping and fix on the product securely.
• Ensure unnatural force, bending, or vibrations will not be transmitted to the product.
• Secure sufficient space for maintenance and inspection (including cleaning of the screen).

Dimensions required for removal of the screen

Nominal Size	A (mm)	B (mm)
50A, 65A	300	180
80A	350	210
100A	400	220
150A	600	280

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.
• This product should be used only when the maximum pressure loss is 0.1 MPa or less. Please also clean the screen regularly. Neglect can result in damage to the screen.
• Remove all pressure within the product, piping, and equipment before disassembly and inspection.

Troubleshooting

Condition of failure	Causes	Measures and treatment
Fluid does not flow.	1. Screen is clogged. 2. The stop valves are closed.	1. Disassemble and clean screen. 2. Open the stop valve(s).
Loss of pressure is great.	1. Screen is clogged. 2. Pressure gauge is out of order. 3. Nominal size is too small.	1. Disassemble 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 and exchange screen.
Cover cannot be removed.	1. Inside of the product is a vacuum. 2. Cover and body are stuck together.	1. Break the vacuum inside the pipe and remove the cover. 2. Refer to Removal of the screen.
Outer leakage occurs.	1. O-ring is damaged. 2. Cover is not assembled properly.	1. Install a new O-ring. 2. Assemble properly.

Removal of the Screen (SU-50S)

1. Loosen eye nuts with a screwdriver.
2. Move arm away from the cover so that it does not touch it. (In case of 150A, move both arms away).
3. Remove cover. If you cannot remove the cover, move one of the screws on the cover to the other side, and screw in the two screws evenly until the cover comes up.
4. Remove screen from the body, and clean with compressed air and cleaning agents.

Assembly after Disassembly

1. Clean body and the portions on the cover that come in contact with the O-ring.
2. Assemble screen onto the cleaned body.
3. Apply silicone grease onto a new O-ring and assemble it onto the slot on the cover, then assemble the cover onto the body.
4. Return arm to the position of stud bolts, then tighten the eye nuts. (Confirm that the plain washers and spring washers have been fit onto the arm before this).

WARNING

• Insufficient cleaning can result in outer leakages.
• Take care not to damage the O-ring upon assembly.
• Make sure that eye nuts are tightened evenly on either side. Do not tighten too tightly.

Tightening torque for the eye nuts (recommended values)

Nominal size	Tightening torque (N·m)
50A, 65A	20
80A-150A	30

Exploded Drawing and Consumables

Name of parts	Durable (Rough standard)
O-Ring	When the cover is replaced or 3 years.
Screen	5 years