What is a Strainer?

A strainer functions very similarly to a filter, and they even have the same applications. The difference between the two is the size. Strainers usually filter larger objects, while filters usually filter smaller objects. How we specifically refer to our products depends on our customers preferences and needs. Our products are considered to be filters, strainers, strainer mesh, mesh filters, mesh strainers, strainer filters, and so on.

Strainers can filter gas, liquid, solids, sound, light, and more.

We work in conjunction with the customer to meet their needs. Whether the customer needs a simple standard filter or a complex custom filter, we help design and manufacture their optimal filter.

The Roles of Strainer Mesh Filters

Fluid Rectification

Fluid Rectifying Filter

Liquids flowing through pipes are often turbulent. A strainer can rectify this turbulent flow and ensure that the flow of the fluid steadily and efficiently reaches its destination. Strainers may also silence noise associated with this flow.

Clogging Counter Measures

Often times unwanted particles and objects can flow through pipes and without any sort of filter this can lead to the pipe becoming clogged. To combat this, a strainer is press-fitted in the direction opposite of the flow. Our filters are designed with large filtration areas and reinforced wire mesh to ensure that the filter does not get damaged under the pressure of being against the flow.

Collection of Foreign Substances

Collection of Foreign Substances

Filters can be fitted in the direction of flow inside the pipe. This leads to foreign substances being both stopped and collected by the filter, protecting the pipe’s destination from being exposed to unwanted materials.                        

Gas and Liquid Separation

The gas and liquid in refrigerants can be separated during the mist state using a special filter. Droplets of water collect on the wire mesh, eventually falling down. Only the gas is able to pass through the filter. The liquid refrigerant, which has been accumulating at the bottom, eventually evaporates and becomes gas, starting the next cycle of separation.

The Main Roles of Metal Filters/ Strainer Mesh Filters

①1. Foreign Material Removal Collects foreign matter such as dust, sand, dirt, and other various scraps flowing through the pipes.
Increases machine performance, improves efficiency, and extends the machine’s lifespan.
②2. Flow Turbulence CorrectionRectifies turbulent flow of liquid within the pipe
Controls the flow rate, mitigates sudden changes in pressure, and reduces noise.
③3. Gas Liquid SeparationAs the name implies it separates gas from liquid.
Liquid particles are removed, and only gas is able to pass through the filter.

Creation and Features of Mesh Filters and Strainers

Mesh Weaving Process

Mesh is woven employing the same methods as traditional textiles. Metal wires are woven together to create a metallic mesh. For metal mesh molding (especially the blank and draw process) it is suitable for mass production when a mold is required. It also has a cheaper unit price than etching.
In addition, the strength and size of the mesh can be adjusted according to how the mesh is folded in order to accommodate a wide range of needs. Iron wires are welded together to create sintered mesh, preventing frayed wires and misalignment from occurring. Multiple meshes are stacked to achieve high filtration performance and excellent pressure resistance levels.

Etching Process

Etching is a method of making holes in a thin metal plate, such as stainless steel, by corroding it with an etching solution (i.e ferric chloride). The original plate cost is low, and it is fine for a small order quantity. However, the manufacturing unit price is higher than that of woven mesh processing, make it less optimal for a large order. Since the filter has been etched instead of woven, it does not have issues with fraying, burrs, or misalignment.

Metal Punching

Metal punching is the process of punching mesh shaped holes out of a plate shaped object. A relatively large hole can be punched out, with a hole diameter of 0.5 mm or more and a pitch of 1.0 mm or more. Since a general-purpose mold is used, it can be manufactured for a relatively low cost. However, this method does not allow for filters with small wire diameters to be manufactured.

Applications of Metal Filters and Strainers

Our metal filters are used in over 60% of domestic air conditioners. In addition to this, our filters are used in automobile engines, car air conditioners, refrigerators, washing machines, gas stoves, gas burners, water heaters, EcoCute systems, vending machines, elevators, water faucets, purification devices, and countless other machines.
The demand for filters for use in next-generation vehicles such as fuel cell vehicles and electric vehicles, hydrogen station dispensers, and aerospace is expanding infinitely.
Vantech is making use of its abundance of experience and technical know-how to break into emerging industries. Vantech will contribute to the development of next generation products to keep up with the changing times.

Choosing a Filter

Shapes and Types of Strainer Filters/Strainer Mesh

Caulked type

Caulked Short Filters

Caulked Short Filter

The caulking mesh filter is Vantech Co., Ltd.’s most commonly produced type of filter. Most of these filters are relatively small in size, with an outer diameter of φ50 or less.
Caulked mesh filters are press-fitted into piping and widely used in refrigerant equipment such as air conditioners, refrigerators, and automobile injectors.

Caulked φ4.75 Filters

Caulked φ4.75 Filter

These are filters whose rings have an outer diameter of φ4.75. They are the smallest type of caulking filter produced by our company. We made them as prototypes at the request of an automobile parts manufacturer.

Caulked SUS Filters

These filters use stainless steel. They are reinforced by a coarse wire mesh. They are used for high temperature environments such as in gas burners.

Brass Mesh Filters

Brass mesh filter

These are our company’s most widely produced filter. They are filters made of a brass ring and brass mesh caulked together. They are commonly used in air conditioning parts. (Dryer, Compressor)

Baffle Plates

Baffle Plate

We have experience in manufacturing baffle plates / accumulator filters to Φ80. We can manufacture according to your requests for size, number of holes, shape of holes, material, etc.
Baffle plates are used in accumulators. Hence, they are also known as accumulator filters
Separates refrigerant mixed with gas and liquid in the process of refrigerant cycle. In the refrigerant cycle, refrigerant may be a mixture of gas and liquid in need of separation. Accumulator Filters collect liquid particles, allowing only for the gas to pass through.

Non-woven Caulked Filters

Non-woven Caulked filter

These filters use non-woven metal fabric. These are capable of high and uniform filtration.


Flange type

Brass Flange Filters

Brass Flanged Filters

These are the standard flange type filters. They are used in air conditioning related parts.

Aluminum Flange Filters

Aluminum Flange Filters

These are flange type filters with an aluminum ring. They are used in car parts.

Welded Flange Filters

Welded Flange Filters

These are welded flange type filters with SuperDyma rings. They are used in large compressors.


Welded type

Welded Long Filters

Welded Long Filters

It is difficult to blank and draw a filter with a large filtration area, and so the wire mesh is welded. We do this through spot or seam welding. It is press fitted into piping and widely used in refrigerant equipment such as air conditioners and refrigerators, and injectors for automobiles.

Spring-mounted Filters

Spring-mounted Filters

By affixing a spring to the inside of the filter, the filter has high pressure resistance. It also prevents clogging by filtering from the opposite direction. It is press-fitted into piping and used for refrigerant equipment such as air conditioners and refrigerators.

Multilayer Sintered Filters 

Multilayer Sintered Filters 

These are high filtration accuracy welded sintered wire mesh filters. They are installed in both outdoor and indoor air conditioners in order to filter foreign substances.

Cleaning Baskets

Cleaning Baskets

After welding the mesh, a stainless steel plate is welded to the perimeter of the basket. We have produced them in a range of Φ70 to φ170. They are baskets used to collect scraps of trash during a given process.

Mesh Molded type

Blanked and Drawn Mesh

Blanked and Drawn Mesh

These are filters that have undergone the blank and draw process. They can be cut into various shapes, sizes, and mesh. These filters are used in car engines, solenoid valves, and water intakes.

Blanked and Drawn Non-Woven Fabric

Blanked and Drawn Non-Woven Fabric

We use non-woven fabrics with high filtration accuracy and sintered woven mesh as a reinforcing material. This is a rare product developed with our company’s technology.

Cylindrical Mesh Filters

Cylindrical Mesh Filters

Mesh is rolled and then welded. They can be manufactured in a variety of mesh, sizes, and types. They are used in automobile parts. They are also used as mesh in resin molding.

Mesh Squashed Filters

Mesh Squashed Filters

By compressing the edges, the product is stronger than products without wire mesh. Reduces tooling costs.
Used for water faucets and gas equipment related products.

Cylindrical Non-Woven Fabric Filters

Cylindrical Non-Woven Fabric Filters

A non-woven fabric with a filtration accuracy of 25 µm is rolled and welded. If requested, a non-woven fabric with a filtration accuracy of 2 µm can be used. It is used in parts pertaining to Biofuel

Other types

Y Strainer Filters

Y Strainer Filters

Perforated metal is used as reinforcement. Upper and lower caps are soldered.
Used for Y strainer.

Punched Strainers

Punched Strainers

Perforated metal rounded and welded. Made to your requested size, used for Y strainer.

8-Mesh Filter

8-Mesh Filter

Outer diameter Φ75, 8 mesh is used.
Used as air conditioner related parts.

Long Mesh Filters

Long Mesh Filters

Two types of wire mesh are used and joined straight by spot welding. Stainless steel coils are used as reinforcement inside.
Rolling oil filter about 1m long. Used in old type rolling mills.

Resin Molded Filters

Resin Molded Filters

Resin / plastic Mold filters utilize metal mesh. Unlike nylon mesh, metal mesh can be used even in high temperature environments.

Etched Filters

These filters use etched materials. Unlike woven mesh it is make from a single plate and is characterized by no misalignment, fraying, or burrs.


Product Examples

Wire mesh filters for air conditioners and compressors

Metal Filters for air conditioners and compressors

Type Short mesh type, welded type
Application Filters inside compressors
Size 6.4~32.0(L)×4.0~30.0(H)mm (Customizable)
Product Detail Blank type, weld type, various shapes。
Mesh Customizable. Two pieces of netting can be used as reinforcement.
Material Wire mesh: brass, stainless steel, metal non-woven fabric, etc.
Ring: brass material, stainless steel, etc.

Accumulator filters

Accumulator filter

Type Drawn type mesh
Application Gas-liquid separation filters in compressors, etc.
Size Customizable
Product Detail In the refrigerant cycle, refrigerant may be a mixture of gas and liquid in need of separation. Accumulator Filters collect mist within the gas, allowing only for the gas to pass through.
Mesh Customizable. Two pieces of mesh can be used as reinforcement.
Material Wire mesh: brass, stainless steel, metal non-woven fabric, etc.
Ring: brass material, stainless steel, etc.

Wire Mesh Filters for injectors

Mesh filter in injectors

Type Short drawn type mesh
Application Filter used within injectors
Size Outer diameter φ4.75~
Please refer to the caulking/short type diagram in the existing strainer size list for a view of sizes.
Product Detail Nylon filters used within injectors may be deteriorated and damaged by ethanol in the fuel. However metallic filters do not have this problem and will not be affected by ethanol damage.
Mesh Plain weave wire mesh, twill weave wire mesh, laminated sintered wire mesh, laminated nonwoven fabric, etc.
We can make proposals according to the filtration particle size.
Material Stainless steel SUS304, SUS316, brass, etc.

Water supply rectifiers, Solenoid valves, Pneumatic machines, etc.

Water supply rectifiers, solenoid valves, pneumatic machines, etc.

Type Other types
Application Water supply, solenoid valves, pneumatic equipment, etc.
Size 3.2 ㎜ ~
Product Detail We can produce products with crushed edges or drawn edges, etc., according to the customer’s instructions.
Mesh Customizable.
Material Sintered wire mesh prevents misalignment. 1 to a maximum of 5 pieces of wire mesh can be sintered.

Other automotive filters

Other automotive filters

Type Spot welding type, caulked type
Application Automobile engines, injectors, etc.
Size φ 4.74 mm 〜 80 mm (Customizable)
Product Detail Mesh and metal fittings will be selected and manufactured according to the customer’s intended use.
Mesh Customizable. Two pieces of mesh can be used as reinforcement.
Material SUS, brass, aluminum, SuperDyma, etc.

Filters for fuel cell vehicles

Filters for fuel cell vehicles

Type Welding type, punching type
Application Fuel cell vehicles, etc.
Size Customizable
Product Detail These are filters with a lot of possible customization. They are produced with extremely advanced technology. Welding can be finished by bright annealing (a method of heat treatment). We can provide one to ten million pieces per lot.
We can provide one piece to tens of millions of pieces/lot in integrated production.
Material We can accommodate a variety of materials and shapes to meet customers’ requirements.

Contact us

Feel free to inquire about prototyping, mass production and mesh sizing.+81 283-86-8668

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