Yoshitake SU-6, SU-6SS, and SU-6AS are Y-type strainers mainly used for cooling water and industrial water for dust prevention. They are designed for large-diameter piping and are lighter than cast iron strainers. The strainers are available with 20 to 100 mesh screens and can be ordered with rust-proof (hot-dip zinc coating) for the SU-6 models.

Specifications

Model	SU-6	SU-6SS	SU-6AS
Application	Cold and hot water, Oil, Other non-dangerous fluids	Cold and hot water, Oil, Other non-dangerous fluids	Cold and hot water, Oil, Other non-dangerous fluids
Nominal Size	150A-650A	150A-650A	200A-650A
Maximum Pressure	1.0 MPa	1.0 MPa	1.0 MPa
Maximum Temperature	120°C	120°C	120°C
Body Material	Carbon steel pipe and rolled steel	General structural rolled steel and stainless steel	Stainless steel
Screen Material	Stainless steel	Stainless steel	Stainless steel
Screen Perforation	φ6-8P (150A), φ10-12.5P (200-650A)	φ10-12.5P	φ10-12.5P
Screen Mesh	Standard 40 mesh	Standard 40 mesh	Standard 40 mesh
Connection	JIS 10K FF flanged	JIS 10K FF flanged	JIS 10K FF flanged

Caution

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 case they do not coincide, do not use the product and contact us.

Operation

Dust, scale and other foreign matter from the fluid flowing into the strainer through the inlet port are removed by the screen.

No.	Part Name
1	Body
2	Cover
3	Gasket
4	Screen
5	Davit Pipe
6	Handle
7	Hanger Rod
8	Plug
9	Plug
10	Bolt
11	Nut
12	Bolt

*The structure differs depending on the nominal size.

Selection of Nominal Size

Selection of Nominal Size of Strainer

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 equipment.

Selection of Nominal Size of Piping

The Japanese Industrial Standard (JIS F 7101) designates the standard flow velocity for piping by type and features of the fluid and pipe size.

Standard flow velocity by fluid

Fluid	Standard velocity
Water & oil	2 m/s (2 - 4)

Pressure Loss Chart for Model SU-6 Strainer (for Water) Screen: φ10-12.5P and 40-mesh

Installation Procedures

Piping Example

Caution in Installation

Warning

• 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.
• Please support the piping and fix on the product securely. The product may deform from too much stress from the piping.
• Upon installation, please secure enough space for maintenance and inspection (including cleaning of the screen) as specified in the Maintenance and Inspection Space table.
• Confirm the connect pipes. If incompletely connected, the fluid may leak from pipes when vibration is caused. The fluid may scald your skin.

Maintenance and Inspection Space

Nominal Size	D (mm)	E (mm)	F (mm)
150A	454	430	1190
200A	496	482	1205
250A	540	540	1565
300A	610	628	1860
350A	656	715	2020
400A	737	766	2290
450A	800	855	2585
500A	847	924	3271
550A	894	995	3581
600A	950	1078	3801
650A	1017	1153	4151

Operation Procedures

Caution

• Please make sure that there is no danger at the pipe end before pouring the fluid. You may get scalded in case hot fluid blow out.
• 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.
• The amount of screen clogging matter can be monitored with pressure gauges installed upstream and downstream of the strainer.

Maintenance Procedures

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 valves.
Pressure loss is high.	1. Screen is clogged. 2. Pressure gauge is out of order. 3. The nominal size is too small for the actual flow rate.	1. Disassemble the strainer and clean screen. 2. Exchange the pressure gauge. 3. Use a strainer with a larger nominal size.

Caution in Maintenance and Inspection

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.
• When using a hot fluid, do not touch the product by bare hand.
• The screen is heavy and shall be securely suspended with a hoist or the like when removed from the product. Failure to suspend the screen may cause it to fall, possibly resulting in injury.

Disassembly Procedures

After checking that there is no residual pressure in the strainer, disassemble it with the following procedures.

1. Remove the bolt and nut from the cover.
2. Push up the cover and separate the cover from the gasket and body. (For 200-650A, rotate the bolt clockwise to push up the cover and separate the cover from the gasket and body.)
3. Rotate the handle clockwise for 3 to 5 turns.
4. Rotate the davit to the right or left.
5. Remove the screen and clean it with compressed air or cleaner. (The screen is heavy and large and shall be removed using a hoist or the equivalent.)

Assembly Procedures

Assemble the product with the opposite procedures of disassembly. When assembling, replace the gasket with a new one and evenly tighten bolts in the diagonally opposite directions to prevent uneven tightening.

Cover Nut Tightening Torque (for reference)

Nominal Size	Nominal Nut Size	Standard Tightening Torque in N-m
200A, 250A	M22	300
300A, 350A, 400A	M24	400
450A, 500A, 550A, 600A, 650A	M30	700

TIP

As the cover nut tightening torques are large, it is recommended to use a power tool (impact wrench or so) capable of tightening to such torques for disassembly and assembly.

Dimensions and Weights

Nominal Size	L	A	Ho	H	H1	ds	ls	Vent plug	Drain plug	Weight (kg)
150A	500	284	830	630	410	200	370	R 1/2	R 1/2	135
200A	620	273	882	687	440	210	375	R 1/2	R 1	130
250A	660	295	1062	867	570	240	505	R 1/2	R 1	185
300A	710	330	1218	1021	670	290	600	R 1/2	R 1	240
350A	760	350	1306	1103	710	340	640	R 3/4	R 1	310
500A	910	455	2195	1945	1400	490	930	R 1	R 1 1/2	650
550A	960	480	2353	2107	1510	540	1030	R 1	R 1 1/2	780
600A	1010	510	2538	2237	1590	590	1100	R 1	R 1 1/2	930
650A	1060	545	2716	2419	1720	640	1170	R 1	R 1 1/2	1100

*Dimensions H1 and Ho are reference values. Dimensional values for additional sizes are shown where OCR data permitted extraction.