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Strainer

Various fluids such as water, oil, gas, air, and steam flowing through various piping lines contain foreign matter in the fluid, corrosion in the piping, gaskets, and other debris from separation. If the fluid is left as it is, the valve seats of various valves installed in the piping lines may be damaged, resulting in shortened service life, and the various devices may not be operated properly or the devices may be damaged. To prevent these problems, strainers that separate and remove foreign matter and dirt from fluids play an important role in the piping line. This strainer has a built-in screen that filters foreign matter and dust in the fluid, and has a structure that allows foreign matter and dust accumulated in the screen to be removed and cleaned while the strainer body remains connected to the piping.
Strainers are classified into Y-type strainers and U-type strainers according to their shapes. In KITZ, we manufacture Y-type strainers, which have relatively low fluidic drag and compact mounting spaces, and U-type strainers, which can be piped directly to equipment.

Foreign matter and dirt in the fluid may damage the valve seat and shorten the life of the equipment or cause the equipment to malfunction. The strainer, which separates and eliminates this foreign matter and debris, plays an important role in the piping line.

The strainer has a built-in screen that filters foreign matter and dust in the fluid, and the strainer body is structured so that foreign matter and debris accumulated in the screen can be removed and cleaned while it remains connected to the piping.

KITZ’s standard strainer screens are shown in the table below.

Type Standard specifications Options*
Y-type strainers Construction Material:
Bronze, cast iron or ductile iron
(except for 20K)
Punched stainless steel sheet in 60°
staggered formation
20-/30-/40-/60-/80-/100-mesh
(Stainless Steel Woven Wire Mesh
backed with a perforated sheet)
Y-type strainers Construction Material:
Ductile iron (except for 20K),
stainless steel or cast iron
40-mesh
(Stainless Steel Woven Wire Mesh
backed with a perforated sheet)
20-/30-/60-/80-/100-mesh
(Stainless Steel Woven Wire Mesh
backed with a perforated sheet)
Y-type strainers, U-type strainers Construction material:
Bronze, lead-free bronze, cast iron or ductile iron
(except for 20K)
(Products conform to the Standard Specifications for Public Construction Work issued by the Ministry of Land, Infrastructure, Transport and Tourism of Japan)
40-mesh
(Stainless Steel Woven Wire Mesh
backed with a perforated sheet)
80-mesh
(Stainless Steel Woven Wire Mesh
backed with a perforated sheet)
U-type strainer
Construction material: Cast iron
Punched stainless steel sheet in 60°
staggered formation

Y-type Strainer Screens - Types and Selection

Screens are used in strainers to trap and remove debris and other foreign matter in flowing liquids or gases. There are three types of screens used in Y-type strainers: perforated screens, which are formed by punching a large number of holes in a flat sheet of stainless steel; mesh screens, which consist of fine stainless steel wires formed into a mesh arrangement in a plain woven pattern (Stainless Steel Woven Wire Mesh) or in Dutch weave (Dutch Weave Wire Mesh); and duplex screens, comprised of a mesh screen combined with a perforated sheet as a backup.
Select the type of screen that best suits your equipment, considering the type of fluid, pressure, flow rate requirements and other conditions.

♦Stainless Steel Woven Wire Mesh
Mesh screens are usually categorized in terms of mesh, which represents the number of openings per linear inch (or 25.4 mm) of the screen. The larger the number of meshes, the finer the screen. Note, however, that the area of the openings varies depending on the wire diameter even with the same number of meshes. Shown on the left is a typical example of a 5-mesh screen (5 openings per linear inch of screen).

[Screen-type]
Perforated screens are usually described in terms of hole diameter, measured from center-to-center.

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