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JIS 10K flange - JIS 10KJIS 10K cast steel Y‑strainer, 1" to 4"
A Y‑strainer in 1" to 4" (DN25 to DN100) with JIS 10K flange ends, a body in A216 WCB cast carbon steel and a removable screen. Rated JIS 10K to −29 °C to 150 °C. No moving parts — it protects, it does not isolate.
The JIS 10K cast steel Y‑strainer
JIS 10K flange ends, A216 WCB cast carbon steel.
A Y‑strainer in 1" to 4" (DN25 to DN100), with JIS 10K flange ends and a body in A216 WCB cast carbon steel. The screen is SS304 — mesh size not published. Rated JIS 10K for service at −29 °C to 150 °C.
It is a tee with a screen in the leg. Flow passes through a mesh element angled down into the branch, anything larger than the opening stays behind, and a cap at the bottom lets you flush it out or lift the screen for cleaning. There are no moving parts and it does not shut anything off — it exists to keep debris out of the pumps, valves, meters and regulators downstream, all of which cost more than it does.
- Dimensions for this variant are quoted per order. The catalogue publishes the part numbers — they are below — but not a dimension table, so we confirm dimensions against your enquiry instead. Ask us for any figure and we will measure a stocked unit.
- Where to look meanwhile. The JIS 10K SS316 strainer publishes a complete table with genuine JIS flange figures — 140, 155, 175, 185 and 210 mm at 1½" to 4". The flanges on this cast steel strainer are the same JIS 10K standard, so those figures tell you what will and will not bolt up, even though the body dimensions differ.
- ⚠ This is not a stainless strainer. Body and cover in A216 WCB cast carbon steel, screen in SS304, not 316. For corrosive duty use the JIS 10K SS316 version.
- ⚠ The screen mesh size is not published either. The page states only “filter screen, SS304”. Specify the mesh you want when ordering. The chart.
- What we can state with confidence: 1" to 4" (DN25 to DN100), JIS 10K flanges, A216 WCB body and cover, SS304 screen, PTFE gasket, A193 B7 / A194 2H bolting, 10K nominal, 3.0 MPa shell test, −29 to 150 °C, and the six‑part bill of materials below. All of that is published consistently; only the dimensions are not.
- 150 °C, against 230 °C for the stainless strainers on the same PTFE gasket. Conservative rather than physical, and we publish it as printed.
- It protects, it does not isolate. Fit a gate valve or a ball valve either side so the screen can be cleaned without draining the line, and a gauge either side so you know when to. Why the gauges matter.
Three angles on the same strainer. Photographs of the stocked item, not renders.
Specification
Everything that goes on a purchase order.
| Size range | 1" to 4" (DN25 to DN100) |
| End connection | JIS 10K flange |
| Working pressure | JIS 10K |
| Working temperature | −29 °C to 150 °C |
| Body and cover | A216 WCB cast carbon steel |
| Screen | SS304 — mesh size not published |
| Gasket | PTFE |
| Shell test | 3.0 MPa |
| Moving parts | None. A strainer does not open, close or throttle |
| Parts in the list | 6 |
| Orientation | Cap pointing downward, flow following the arrow cast into the body — see fitting |
| Cleaning | Flush through the bottom cap, or lift the self‑aligning screen out through the cover |
| Catalogue | The manufacturer’s PDF for this variant |
| Stock | Held in Malaysia or Singapore |
Bill of materials
All 6 parts. There is not much to a strainer, which is the point.
| No | Part name | Material |
|---|---|---|
| 1 | Body | WCB |
| 2 | Filter Screen | SS304 |
| 3 | Gasket | PTFE |
| 4 | Cover | WCB |
| 5 | Bolt | ASTM A193 B7 |
| 6 | Nut | ASTM A194 2H |
The manufacturer’s sectional drawing. The callout numbers correspond to the item numbers in the parts list.
- The screen is the only wear part. Everything else is a casting or a fastener. It is the part to keep a spare of, and the part to ask us about first.
- The item numbers are the manufacturer’s, matching the callouts on the drawing above, so a spares order matches the section.
- PTFE on the gasket — the same on all five variants in this range, which is what makes the temperature differences between them hard to explain.
- Everything here is published, not on request. If you need to know what touches your fluid, the whole list is above.
Sizes and part numbers
Seven part numbers. Dimensions quoted per order.
The catalogue publishes the sizes and part numbers for this variant — they are below — but not a dimension table, so dimensions are quoted per order: tell us the size and we measure a stocked unit.
| Size | Part no |
|---|---|
| 1" | VL-CS-YS-F-10K-16 |
| 1¼" | VL-CS-YS-F-10K-20 |
| 1½" | VL-CS-YS-F-10K-24 |
| 2" | VL-CS-YS-F-10K-32 |
| 2½" | VL-CS-YS-F-10K-40 |
| 3" | VL-CS-YS-F-10K-48 |
| 4" | VL-CS-YS-F-10K-64 |
What to do instead
- Ask us and we will measure a stocked unit. Face‑to‑face, height, flange diameter, bolt circle, weight — whichever you need, off the shelf, not off a datasheet.
- For the flange interface, use the JIS 10K SS316 table. Its figures are genuine JIS 10K — flange outside diameters of 140, 155, 175, 185 and 210 mm at 1½" to 4". The flanges on this strainer are the same standard, so that tells you what will and will not bolt up.
- The body dimensions will differ. A cast steel strainer is not the same casting as a stainless one, so do not take the length or height from that table — only the flange interface.
- Send us the gap in your pipe run and we will confirm the strainer fits before you order.
Why we did not just print it
- A table of the word “Value” repeated forty‑nine times is not a specification, and republishing it would look like data.
- Someone would eventually copy a figure out of it, and there is no figure in it to copy.
- The part numbers are genuine and consistent with the rest of the range — VL‑CS‑YS‑F‑10K‑nn, correctly carrying the 10K code, unlike the ANSI cast steel variant which carries 10K by mistake.
- Everything else on this page — materials, pressure, temperature, test, construction — is published consistently and is reproduced in full.
Test pressure and temperature
As published. Where a field is blank, we say so.
| Normal Pressure | JIS 10K |
| Shell Test Pressure | 3.0 MPa |
| Tightness Test | - |
| Gas-Tightness Test | - |
| Max Working Pressure | -29&°;C to 150&°;C |
- ⚠ A shell test is a proof test, not a working pressure. Where 3.0 MPa is published it is roughly twice the nominal rating and exists to prove the casting. Do not design to it.
- ⚠ Pressure rating is not what limits a strainer in service. Differential pressure across a blocking screen is what collapses an element, and that happens far below the shell rating. It is the real failure mode, and it gives no warning. Watch the differential.
- The five variants carry different ratings. The stainless strainers are rated to 230 °C and the cast steel ones to 150 °C, both on a PTFE gasket. All five side by side.
Not sure this is the right one?
End connection first, then material, then mesh.
Choose this one when
- Your pipework takes JIS 10K flange ends — checked, not assumed.
- Working pressure is within JIS 10K and temperature within −29 °C to 150 °C.
- The duty suits A216 WCB cast carbon steel.
- Your size falls in 1" to 4".
Choose something else when
- Your end connection is different → the other four variants. Nothing here adapts across end types.
- The fluid or environment is corrosive → an SS316 variant. This is carbon steel with a 304 screen.
- You need a size below 1", or more than 150# → threaded SS316, 1/4" to 4" at 800 PSI.
- You need to isolate rather than strain → gate valves or ball valves.
- You need to stop reverse flow → check valves.
All five, side by side: the comparison table. Other variants: ANSI 150 SS316 · JIS 10K SS316 · ANSI 150 cast steel · Threaded SS316.
Questions we get asked
The ones that come up on the phone.
What is the JIS 10K cast steel Y‑strainer?
A Y‑strainer in 1" to 4" (DN25 to DN100) with JIS 10K flange ends, a body in A216 WCB cast carbon steel and a screen in SS304 - mesh size not published. Rated JIS 10K for service at −29 °C to 150 °C. It is a tee with a screen in the leg — no moving parts, and it does not isolate.
What is it for?
Keeping pipeline debris out of the equipment behind it. Weld spatter, pipe scale, rust, thread cuttings and jointing compound all travel with the flow and all arrive at whatever is narrowest downstream — a globe valve seat, a control valve trim, a flow meter, a pump impeller. Every one of those costs more than the strainer and takes longer to replace. What it is protecting, item by item.
Which mesh should I order?
Work back from the smallest clearance you are protecting and choose a screen finer than that — then do not go finer than you need, because every step finer raises pressure drop and shortens the interval between cleanings. This variant does not publish a mesh size, so tell us what you want rather than assuming. The full chart, 10 mesh to 120.
Does a higher mesh number mean finer or coarser?
Finer. Mesh number counts openings across one linear inch, so more openings in the same inch means smaller openings: 10 mesh passes 2000 microns, 120 mesh passes 125.
Which way up does it go?
Cap pointing downward, so gravity holds the debris in the leg instead of letting it fall back into the flow every time the system stops. Flow follows the arrow cast into the body. On a vertical run, flow must be downward. And leave clearance below it, because the screen comes out downward through the cover. The full five‑step procedure.
How often will it need cleaning?
There is no fixed interval and anyone who gives you one is guessing — it depends entirely on how dirty your fluid is. Fit a pressure gauge either side and record the drop when the screen is clean; that baseline is what every later reading is judged against. Expect to check often in the first weeks of a new system, when the pipework is shedding its own construction debris. How to monitor it.
What is it made of?
Body and cover in A216 WCB cast carbon steel, screen in SS304 - mesh size not published, gasket in PTFE. Note this is not a stainless strainer — the body is cast carbon steel and only the screen is stainless, and that screen is SS304, not 316. Bolting is A193 B7 with A194 2H nuts. For corrosive duty use an SS316 variant.
Will it fit my pipework?
It has JIS 10K flange ends. On a flanged strainer the pressure rating does not answer that question — ANSI 150 and JIS 10K are rated similarly and drilled differently, so check the bolt circle on the mating flange. At 2" the JIS flange is 155 mm across against 152 mm for ANSI: close enough to look interchangeable. Send the size and end type, or a photo, and we will confirm. All five compared.
What are the test pressures?
The published shell test is 3.0 MPa, roughly twice the JIS 10K nominal rating. That is a proof test, not a working pressure — do not design to it. And note that what actually destroys a strainer in service is differential pressure across a blocked screen, which happens far below the shell figure.
Do you supply spare screens?
Yes — the screen is the only wear part on the whole assembly and we stock them. Send the size, the variant and the mesh you want. Keeping one on the shelf is the difference between a clean and a shutdown, because a torn screen filters nothing and gives no sign that it has stopped.
What sizes do you hold in stock?
1" to 4" (DN25 to DN100), held in Malaysia or Singapore. Send the size, the end connection and the mesh and we will confirm availability and a landed price — transport, currency, duties and taxes already inside the figure.
Catalogue
Direct PDF download — no form, no email address.
Send the size, the end connection and the mesh
We will confirm the JIS 10K flange ends match your pipework, recommend a mesh for what you are protecting, and quote a landed price with a spare screen. Stock in Malaysia and Singapore.