Yoshitake SY-40 series strainers are widely used for dust removal from various types of pipelines. A strainer should be installed upstream of a pressure reducing, temperature regulating, solenoid, or trap valve to protect and maintain it. The series includes the standard SY-40, the corrosion-resistant SY-40C with nylon coating, and the high-pressure SY-40H.

Features

• High-flow-rate marine type: Designed with the largest possible filtration area to prevent flow rate drop caused by clogging.
• Compact Design: Models with a nominal size of 65A or above have been downsized and reduced in weight to ease piping.
• Corrosion Resistance: The SY-40C-N (15A to 150A) features excellent corrosion resistance, as its inner and outer surfaces are coated with Nylon 11 or Nylon 12.
• Standard Mesh: 80 mesh screens are used for SY-40 and SY-40H, and 60 mesh for SY-40C, conforming to standard machinery specifications.

Specifications

Model	SY-40	SY-40C	SY-40H
Nominal Size	15-300A	65-150A	15-150A
Application	Steam, air, hot/cold water, oil, non-dangerous fluids	Air, hot/cold water, non-dangerous fluids	Steam, air, hot/cold water, non-dangerous fluids
Maximum Pressure	1.0 MPa	1.0 MPa	2.0 MPa
Maximum Temperature	220°C	60°C	220°C
Body Material	Ductile cast iron	Ductile cast iron (Nylon coated)	Ductile cast iron
Screen Material	Stainless steel	Stainless steel	Stainless steel
Connection	JIS 10K FF flanged	JIS 10K FF flanged	JIS 20K FF flanged
Standard Perforations	φ2.5-4P	φ2.5-4P	φ2.5-4P
Standard Mesh	80 mesh	60 mesh	80 mesh

• Available with 20 to 100 mesh screen (perforation: φ2.5-4P) or only perforation (15A to 80A: φ1.3-2.7P, 100A or more: φ1.5-3.2P) on request.
• Available with a brass plug (standard is S15C or FCMB310).
• Rust-proof (hot dip galvanized) options are available for sizes 65A or above (except SY-40C).

Dimensions and Weights

15A - 50A

Nominal Size	L (mm)	H1 (mm)	ds (mm)	ls (mm)	Plug	Weight (kg)
15A	130	61	22	40	-	1.9
20A	140	75	27	56	-	2.5
25A	160	88	34	66	-	4.0
32A	175	104	43	76	-	5.2
40A	190	115	50	85	R 1/2	6.7
50A	225	140	61	107	R 1/2	10.2

Note: No plug is provided with 15A to 32A models.

65A - 300A

Nominal Size	L (mm)	H1 (mm)	ds (mm)	ls (mm)	Plug	Weight (kg)
65A	255	167	73	125	R 1/2	14.5
80A	330	190	88	130	R 1/2	18.3
100A	370	225	108	180	R 3/4	29.7
125A	415	263	136	200	R 3/4	40.5
150A	495	315	160	250	R 3/4	66.0
200A	565	385	210	300	R 3/4	95.8
250A	690	460	260	370	R 3/4	167.5
300A	840	556	315	442	R 3/4	286.0

Pressure Loss Chart

Screen: Perforation = φ2.5-4P, Mesh = 80 mesh.

Operating Mechanism

No.	Part Name	No.	Part Name
1	Body	6	Plug
2	Screen	7	Strainer retainer
3	Gasket	8	Hexagon nut
4	Cap	9	Stud bolt
5	Cover	10	Washer

Dust, scale, and other foreign matter from the fluid flowing into the strainer through the inlet port are removed by the screen (2).

Piping Selection

To make the best use of the strainer, select a nominal size equivalent to that of the pipe. Using a smaller nominal size increases the pressure loss. The preferred initial pressure loss is 0.02-0.03 MPa.

Standard Fluid Velocity (JIS F 7101):

Fluid	Remarks	Standard Flow Velocity
Saturated steam	Small-diameter / Auxiliary	15 m/s (10-20)
Saturated steam	Large-diameter	30 m/s (20-40)
Superheated steam	φ75 – φ250	40 m/s (30-50)
Superheated steam	High-grade material	70 m/s (65-80)
Air	Higher pressure (≥1.0 MPa)	20 m/s (20-25)
Air	Lower pressure	15 m/s (5-15)
Water or oil	-	2 m/s (2-4)

Installation Procedure

Installation and Operation Cautions

• Orientation: Install the pipe so that the fluid flowing direction follows the arrow on the body. Connecting pipes in wrong directions prevents the product from performing as intended.
• Support: Firmly support pipes and secure the product. Excessive stress can deform the product.
• Position: Install with the cap (4) or cover (5) facing downward. If drainage issues may occur in a steam line, install sideways. If fluid flows bottom-to-top, install a blow valve to remove scale at the riser base.
• Safety: Ensure piping internal pressures are released and hot fluid is cooled before maintenance.

Screen Removal Space

When installing, reserve enough space for screen maintenance and cleaning.

Nominal Size	H Clearance (mm)	Nominal Size	H Clearance (mm)
15A	80	80A	245
20A	105	100A	310
25A	125	125A	365
32A	145	150A	445
40A	160	200A	550
50A	200	250A	675
65A	220	300A	805

Maintenance and Troubleshooting

Problem	Cause	Solution
Fluid does not flow.	1. Screen is clogged. 2. Upstream/downstream stop valves closed.	1. Overhaul and clean screen. 2. Open the stop valves.
Excessive pressure loss	1. Screen is clogged. 2. Pressure gauge is out of order. 3. Nominal size is too small.	1. Overhaul and clean screen. 2. Replace pressure gauge. 3. Change to adequate nominal size.

Assembly Procedure

1. Clean the gasket mating faces of the body and cap/cover.
2. Install the cleaned screen. For 100A+, ensure the strainer retainer is aligned with the notch on the body and rotated until hung.
3. Install a new gasket and re-install the cap or cover. Uniformly tighten bolts in diagonally opposite directions.