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NPT or BSPP threaded - 800 PSIThreaded SS316 Y‑strainer, 1/4" to 4"
A Y‑strainer in 1/4" to 4" (DN8 to DN100) with NPT or BSPP threaded ends, a body in SS316 with A351 CF8M cast stainless and a removable screen. Rated 800 PSI. No moving parts — it protects, it does not isolate.
The Threaded SS316 Y‑strainer
NPT or BSPP threaded ends, SS316 with A351 CF8M cast stainless.
A Y‑strainer in 1/4" to 4" (DN8 to DN100), with NPT or BSPP threaded ends and a body in SS316 with A351 CF8M cast stainless. The screen is SS316 — mesh size not published. Rated 800 PSI for service at not published.
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.
- The full range is 1/4" to 4", DN8 to DN100. The dimension table carries full rows with part numbers from 1/4" up, and 1/4" through 1¼" are available in both thread forms.
- Rated 800 PSI — the highest in the Y‑strainer range. The catalogue does not print a test pressure or working temperature for this variant; we obtain both from the factory before you commit to anything demanding.
- The only option below 1". The flanged variants start at 1" (cast steel) or 1½" (stainless), so everything from 1/4" to 3/4" is this strainer. It also overlaps the whole flanged range up to 4".
- 22 part numbers: eleven sizes in each thread form. VL‑S‑YS‑G‑800‑nn for BSPP and VL‑S‑YS‑N‑800‑nn for NPT, with identical dimensions and weights in both — only the thread differs. The G and N in the code are the thread form, so the number tells you which you are getting.
- 1/4" and 3/8" share identical dimensions (ØD 9, L 65, H 35) with no weight published, and the catalogue gives 1/2" as L = 61 mm. We quote all three as the catalogue prints them and confirm on enquiry.
- BSPP is parallel, not tapered. It seals on a washer or a bonded seal at the face, not on the thread. That is different from the BSPT taper used on the globe valve range, and the two are not interchangeable.
- Weights from 1/2" up, 0.19 kg to 7.20 kg at 4". Even the largest is a fraction of the flanged equivalent.
- 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 | 1/4" to 4" (DN8 to DN100) |
| End connection | NPT or BSPP threaded |
| Working pressure | 800 PSI |
| Working temperature | not published |
| Body and cover | SS316 with A351 CF8M cast stainless |
| Screen | SS316 — mesh size not published |
| Gasket | PTFE |
| Shell test | not published |
| 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 | SS316 and CF8M |
| 2 | Filter | SS316 |
| 3 | Gasket | PTFE |
| 4 | Cap | SS316 and CF8M |
| 5 | Gasket | PTFE |
| 6 | Plug | SS316 |
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 dimensions
22 sizes. Dimensions in millimetres, weights in kilogrammes.
The dimension that decides whether it fits is the end‑to‑end length L — the gap it needs in the pipe run. On a flanged strainer you also need the bolt circle and hole pattern to match the mating flange. And leave clearance below the strainer: the screen comes out downward through the cover, and on the larger sizes that is not a small allowance.
| Size | Thread | IMPA | Part no | Screen bore ØD | Length L | Height H | Weight (kg) |
|---|---|---|---|---|---|---|---|
| 1/4" | BSPP | – | VL-S-YS-G-800-04 | 9 | 65 | 35 | – |
| 3/8" | BSPP | – | VL-S-YS-G-800-06 | 9 | 65 | 35 | – |
| 1/2" | BSPP | – | VL-S-YS-G-800-08 | 14 | 61 | 43 | 0.19 |
| 3/4" | BSPP | – | VL-S-YS-G-800-12 | 18 | 80 | 50 | 0.38 |
| 1" | BSPP | – | VL-S-YS-G-800-16 | 22 | 84 | 63 | 0.55 |
| 1 1/4" | BSPP | – | VL-S-YS-G-800-20 | 28 | 99 | 70 | 0.68 |
| 1 1/2" | BSPP | – | VL-S-YS-G-800-24 | 38 | 108 | 82 | 0.94 |
| 2" | BSPP | – | VL-S-YS-G-800-32 | 48 | 131 | 94 | 1.60 |
| 2 1/2" | BSPP | – | VL-S-YS-G-800-40 | 70 | 175 | 115 | 2.70 |
| 3" | BSPP | – | VL-S-YS-G-800-48 | 80 | 190 | 135 | 4.10 |
| 4" | BSPP | – | VL-S-YS-G-800-64 | 110 | 240 | 152 | 7.20 |
| 1/4" | NPT | – | VL-S-YS-N-800-04 | 9 | 65 | 35 | – |
| 3/8" | NPT | – | VL-S-YS-N-800-06 | 9 | 65 | 35 | – |
| 1/2" | NPT | – | VL-S-YS-N-800-08 | 14 | 61 | 43 | 0.19 |
| 3/4" | NPT | – | VL-S-YS-N-800-12 | 18 | 80 | 50 | 0.38 |
| 1" | NPT | – | VL-S-YS-N-800-16 | 22 | 84 | 63 | 0.55 |
| 1 1/4" | NPT | – | VL-S-YS-N-800-20 | 28 | 99 | 70 | 0.68 |
| 1 1/2" | NPT | – | VL-S-YS-N-800-24 | 38 | 108 | 82 | 0.94 |
| 2" | NPT | – | VL-S-YS-N-800-32 | 48 | 131 | 94 | 1.60 |
| 2 1/2" | NPT | – | VL-S-YS-N-800-40 | 70 | 175 | 115 | 2.70 |
| 3" | NPT | – | VL-S-YS-N-800-48 | 80 | 190 | 135 | 4.10 |
| 4" | NPT | – | VL-S-YS-N-800-64 | 110 | 240 | 152 | 7.20 |
- ⚠ Leave room under it, not just around it. A strainer you cannot get the screen out of is a strainer nobody cleans, and a screen nobody cleans eventually tears.
- Measure the gap in the run against L. On a replacement, measure the unit coming out rather than trusting a drawing.
- Support the weight. A strainer must not hang on the pipework, and it must never be used to pull a misaligned flange together.
- Letters follow the manufacturer’s drawing. Where a letter is ambiguous we have left it as published rather than guess at it.
Test pressure and temperature — not published
The highest‑rated strainer here, and the one with the least published data.
The other four variants in this range each publish a test table: a 3.0 MPa shell test and a working temperature range. This variant publishes neither. There is no test table on the manufacturer’s sheet at all — not a blank one, none — and no working temperature anywhere on the page. The only rating given is 800 PSI.
What is published
- 800 PSI working pressure — more than five times the flanged variants in this range.
- Body and cap in SS316 and A351 CF8M, screen in SS316, gaskets in PTFE, plug in SS316.
- Full dimensions and weights for eleven sizes in each of two thread forms — the table.
- A sectional drawing with callouts matching the six‑part list, and the three dimension letters labelled on it.
What we will get for you
- The shell test figure. On an 800 PSI body it should be substantially above the 3.0 MPa quoted for the 150# and 10K variants, but we will not print a number we have not been given.
- The working temperature range. The gasket is PTFE, the same as the stainless flanged variants that are rated to 230 °C — but that is an inference, not a published figure, and we are not going to quote it as one.
- Ask before you commit to anything demanding. If your duty is hot, or near the pressure rating, tell us and we will get both figures from the factory first.
- ⚠ And remember what actually destroys a strainer: differential pressure across a blocked screen, which happens far below any shell rating. Watch the differential.
Not sure this is the right one?
End connection first, then material, then mesh.
Choose this one when
- Your pipework takes NPT or BSPP threaded ends — checked, not assumed.
- Working pressure is within 800 PSI.
- The duty suits SS316 with A351 CF8M cast stainless.
- Your size falls in 1/4" to 4".
Choose something else when
- Your end connection is different → the other four variants. Nothing here adapts across end types.
- The duty is clean and non‑corrosive and cost matters → a cast steel variant.
- 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 · JIS 10K cast steel.
Questions we get asked
The ones that come up on the phone.
What is the Threaded SS316 Y‑strainer?
A Y‑strainer in 1/4" to 4" (DN8 to DN100) with NPT or BSPP threaded ends, a body in SS316 with A351 CF8M cast stainless and a screen in SS316 - mesh size not published. Rated 800 PSI for service at not published. 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 SS316 with A351 CF8M cast stainless, screen in SS316 - mesh size not published, gasket in PTFE. Everything in the pressure boundary is stainless. The full numbered list is on this page.
Will it fit my pipework?
It has NPT or BSPP threaded ends. BSPP and NPT are not interchangeable — BSPP is a 55° parallel thread that seals on a washer or a bonded seal, NPT is a 60° taper that seals on the thread flanks. State which one you need; the part number changes with it. Send the size and end type, or a photo, and we will confirm. All five compared.
What are the test pressures?
None are published for this variant. It is the highest‑rated item in the Y‑strainer range at 800 PSI and the one with the least published test data — no shell test, no tightness test and no temperature. The other four all state a 3.0 MPa shell test. We will get the figures from the factory before you commit to anything demanding.
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?
1/4" to 4" (DN8 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 NPT or BSPP threaded 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.