Product Overview

Yoshitake SY-5 Strainer is an economical filtration device designed for dust removal needs in various piping systems. It is especially suitable for installation upstream of pressure reducing valves, temperature control valves, solenoid valves, steam traps, and other valves to extend downstream equipment lifespan from protection and maintenance perspectives. The product features wide application and compact, lightweight design, with enlarged filtration area to address flow reduction caused by clogging, ensuring smooth fluid passage.

Technical Specifications

Basic Parameters

Parameter	Specification
Applicable Fluid	Steam, Air, Hot/Cold Water, Oil, Other Non-hazardous Fluids (SY-6 recommended for hot/cold water)
Max Pressure	2.0 MPa
Max Temperature	220°C
Body Material	Ductile Cast Iron
Screen Material	Stainless Steel
Standard Screen Spec	80 mesh (hole count: 2.5-7.21 holes/cm²)
Customizable Mesh	20-100 mesh
Customizable Hole Count	1.2-23.8 holes/cm²
Connection Type	JIS Rc Threaded
Pressure Loss Control	Recommended below 0.1MPa

Nominal Diameter and Thread Specifications

Nominal Diameter	Thread Spec (d)
10A	Rc 3/8
15A	Rc 1/2
20A	Rc 3/4
25A	Rc 1
32A	Rc 1-1/4
40A	Rc 1-1/2
50A	Rc 2

Dimensions and Weight

Nominal Diameter	Thread Spec (d)	Length L (mm)	Height H1 (mm)	ds (mm)	ls (mm)	Gasket Spec (OD×ID×Thickness)	Plug Size	Weight (kg)
10A	Rc 3/8	65	50	18	32	φ30.5×φ24×1.0	(R 1/4)	0.4
15A	Rc 1/2	75	55	20	35	φ34.5×φ26×1.0	(R 1/4)	0.6
20A	Rc 3/4	90	70	25	50	ø41.5×326×1.0	(Rc 3/8)	0.9
25A	Rc 1	110	85	32	60	φ50.5×φ40×1.0	(R 3/8)	1.4
32A	Rc 1-1/4	135	95	40	70	φ61.5×φ50×1.0	(R 3/8)	2.2
40A	Rc 1-1/2	145	105	45	75	φ67.5×φ55×1.0	R 3/8	3.4
50A	Rc 2	170	120	56	90	φ78.5×φ65×1.0	R 3/8	4.5

Note

1. Plug sizes in parentheses apply to products with plugs;
2. Products with plugs available for 10A-32A;
3. Gaskets, screens, etc. should use our company's compatible products.

Operating Principle

The SY-5 Strainer operates on a simple and efficient principle: fluid flows in from the strainer inlet side, passes through the stainless steel screen for filtration, where debris, iron slag, and other foreign matter are intercepted by the screen. The filtered clean fluid flows out from the outlet, protecting downstream piping and equipment from debris damage. By installing pressure gauges before and after the strainer, screen clogging can be determined based on pressure differential changes for timely cleaning and maintenance.

Selection Guide

Diameter Selection Principles

1. Strainer diameter should match pipe diameter (pipe diameter = strainer diameter). Using undersized products will increase pressure loss and may cause insufficient inlet pressure for equipment.
2. When selecting pipe diameter, consider fluid type, maximum flow rate, allowable pressure loss, and piping equipment costs:
   • Undersized pipe diameter: While reducing equipment costs, it increases pressure loss and may cause turbulence, increased friction velocity, and vibration.
   • Oversized pipe diameter: Increases equipment costs and heat loss.
3. Refer to JIS standard flow velocities for pipe diameter selection. Standard flow velocities for various fluids are as follows:

Fluid	Description	Standard Velocity (m/s)
Saturated Steam	Vacuum or small diameter auxiliary pipes	15 (10~20)
Saturated Steam	Large diameter	30 (20~40)
Superheated Steam	Diameter φ75~250	40 (30~50)
Superheated Steam	High-grade material pipes	70 (65~80)
Steam Coil Inlet	0.3~0.7MPa	30 (25~30)
Air	High pressure (above 1.0MPa)	20 (20~25)
Air	Low pressure	15 (5~15)
Air	Very low pressure (below 0.1MPa)	10 (3~10)
Water, Oil	-	2 (2~4)

Note

The above table is based on JIS F7101 (Marine Engine Room Pipe Flow Velocity Standards). A safety factor of 20% above performance values is recommended for selection.

Pressure Loss Reference

For the SY-5 Strainer (standard screen: 80 mesh, hole count 2.5-7.21 holes/cm²) with water as the fluid, refer to the product pressure loss chart for the relationship between pressure loss and flow rate. Different nominal diameters have different flow-pressure loss characteristics; consult based on actual application scenarios.

Installation Instructions

Pre-Installation Precautions

1. Confirm inlet/outlet direction and installation orientation during installation; incorrect direction will prevent proper operation.
2. Adequate space must be provided for screen removal to facilitate subsequent cleaning and maintenance.
3. Do not apply excessive load, bending, or vibration to the product when connecting pipes to avoid leakage.
4. Remove debris and foreign matter from pipes before installation, and ensure sealing tape and liquid sealant used for pipe connections do not enter the piping to prevent product malfunction.
5. Do not pipe dissimilar metals that create potential differences, as this will cause product or component corrosion.
6. If absolutely no foreign matter passage is allowed, consult the manufacturer in advance.

Installation Requirements

1. Installing pressure gauges before and after the strainer is recommended to determine screen clogging based on pressure differential.
2. For standard installation, the bonnet should face downward; for steam applications, the bonnet should face sideways when connecting pipes to reduce condensate accumulation.
3. For pipes with upward fluid flow, install a stop valve to discharge debris accumulated at the bottom.

Maintenance

Operating Precautions

Warning

1. Do not touch the product directly by hand when fluid is at high temperature to avoid burns.
2. When installed in sealed piping, be aware of volume expansion due to fluid temperature rise to avoid product damage.
3. Do not turn the bonnet after fluid is flowing, as this may damage the gasket and cause external leakage.
4. Avoid impacts from water hammer and other severe pressure fluctuations to prevent product and component damage.

Precautions

1. Control pressure differential below 0.1MPa during operation and clean the screen regularly to prevent screen damage.
2. The product structure cannot guarantee complete filtration of foreign matter equivalent to the indicated mesh size; select appropriate screen based on actual requirements.

Disassembly, Cleaning, and Assembly

Disassembly/Inspection Warning

Before disassembly and inspection, internal pressure in the product, piping, and equipment must be completely released. If fluid is at high temperature, allow cooling before work to avoid injury or burns from residual pressure.

Disassembly and Cleaning Steps

1. After confirming no pressure in the strainer body using a pressure gauge, remove the bonnet and take out the screen.
2. Use compressed air or water to flush the screen and remove debris.

Assembly Precautions

Precautions

1. Clean the gasket contact surfaces of the body and bonnet before assembly; improper cleaning may cause fluid leakage at the gasket and burns.
2. When reassembling, gaskets must be new; do not reuse old gaskets, as this will cause fluid leakage.
3. Assembly sequence: Replace with new gasket and install on bonnet, fit the cleaned screen into the bonnet groove, then screw the bonnet into the body.