A check valve using two half-discs on a torsion spring in 1½″–6″ (DN40–DN150) with Wafer, clamped between flanges ends, a SS316 / CF8M body and EPDM seat ring. It works in any orientation — a spring closes it, not gravity. Temperature ≤ 150 °C.
Send the size and the flange standard — quotes within 2 working hours.
| Type | Wafer · 1½″–6″ · 7 flange standards |
|---|---|
| Size | 1½″–6″ (DN40–DN150) |
| Ends | Wafer, clamped between flanges |
| Body | SS316 / CF8M |
| Seat | EPDM seat ring |
| Pressure | PN40 |
| Temperature | ≤ 150 °C |
| Closes on | A spring — any orientation |
| Flange standards | 150#, 300#, JIS 5K, JIS 10K, PN10, PN16 and PN40 |
A spring closes it, not gravity — so orientation is free.
A ring with two half-discs in it, hinged on a shaft straight across the middle and held closed by a torsion spring wound round that shaft. Forward flow folds the two halves back against the spring like a pair of swing doors; when flow falls away the spring folds them shut again. The whole thing lives in a wafer body — a thin ring with no bolt holes.
Two consequences, and both are the reason this valve exists. It is very short, so it goes where a flanged check valve will not fit. And because each disc is half the diameter and travels a short distance with a spring already pushing it, it closes far more gently than a single heavy disc swinging through 90°. That is the standard answer to water hammer.
A spring closes it, not gravity — so unlike a swing check valve there are no rules about which way up it goes. Flow must still follow the arrow.
Debris on the seat holds the disc fractionally open and it passes reverse flow while looking normal. Fit a Y-strainer upstream, and inspect it when you get the chance.
A wafer body is held only by the flange bolts passing either side of it. Remove one flange and nothing holds the valve.
A wafer body sits between the flanges. A flanged swing check at 6″ needs 356 mm of pipe run to itself; a wafer check needs almost none.
Orientation stops mattering; direction never does. Fitted backwards, any check valve blocks the line.
Not the body. The body is SS316; what limits it is the elastomer or the metal at the seat, and that is the thing to specify.
Photographs of the stocked item, not renders.
So the valve can be identified with no paperwork. If you need to confirm an installed unit, send us a photograph and we will read it.
If you need to identify a part before ordering spares, ask — we will number it up on a photograph of a unit in the warehouse.
Everything that goes on a purchase order.
| Item | Value |
|---|---|
| Size range | 1½″–6″ (DN40–DN150) |
| End type | Wafer, clamped between flanges |
| Flange standards | 150#, 300#, JIS 5K, JIS 10K, PN10, PN16 and PN40 |
| Body | SS316 / CF8M |
| Seat | EPDM seat ring |
| Working temperature | ≤ 150 °C |
| Nominal pressure | PN40 |
| Strength test | 6.0 MPa |
| Seal test | 4.4 MPa |
| Air seal test | 0.6 MPa |
| Design | API 594 |
| Face-to-face | ANSI B16.10 |
| Inspection and test | API 598 |
| Closes on | A spring — works in any orientation |
| Parts in the list | 5 |
| Stock | Held in Malaysia or Singapore |
The nominal PN40 in the test sheet is the top of this range. A PN10 body is not a PN40 valve. Ask for the rating of the one you are ordering.
The strength test proves the casting, the seal test proves the disc against its seat. Do not design to these figures.
The body is SS316 and would take far more heat. What limits it is the rubber at the seat.
7 rows. Millimetres.
On a wafer valve the body OD matters as much as the length: the body has to sit inside the flange bolt circle without fouling the bolts.
| Size | Part no | DN | Face-to-face L | ØD |
|---|---|---|---|---|
| 1½″ | VL-S-DD-W-600-24 | 40 | 44 | 100 |
| 2″ | VL-S-DD-W-600-32 | 50 | 60 | 103.7 |
| 2½″ | VL-S-DD-W-600-40 | 65 | 67 | 122.7 |
| 3″ | VL-S-DD-W-600-48 | 80 | 73 | 135.4 |
| 4″ | VL-S-DD-W-600-64 | 100 | 73 | 173.5 |
| 5″ | VL-S-DD-W-600-80 | 125 | 87 | 192 |
| 6″ | VL-S-DD-W-600-96 | 150 | 99 | 220 |
The column headings here are the letters on the sectional drawing below. Where a letter is ambiguous we have left it as published rather than guess at it.
The ØD1 column is a body diameter to check for clearance, not a bolt circle. For ANSI 150 at these sizes the bolt circles are 120.7 · 139.7 · 152.4 · 190.5 · 215.9 and 241.3 mm.
A wafer body is centred by the flange bolts and has nothing of its own to hang on. The eye bolt on the drawing is there for exactly that.
Anything missing from this table we measure off a stocked valve, same day. Just say which dimension.
5 callouts, and 5 items in the parts list below — the two match one for one. The dimension letters are the column headings in the size table above: L face-to-face, ØD the body OD and NPS the bore.
Callout numbers are the item numbers in the parts list below, and the dimension letters are the column headings in the size table above.
Everything else is a casting, the spring or a fastener. Those two surfaces take the duty every time the valve closes.
This is a catalogue section, not a manufacturing drawing: no tolerances and no material callouts. Order spares by the item numbers in the parts list.
All 5 parts, as printed.
| No. | Part name | Material |
|---|---|---|
| 1 | Body | CF8M / SS316 |
| 2 | Seat ring | EPDM |
| 3 | Wedge | CF8M / SS316 |
| 4 | Spring | SS316 |
| 5 | Pin | SS316 |
They match the callouts on the sectional drawing above, so a spares order matches the section rather than a description.
Cast 316, which means it resists chlorides far better than 304 — and on a check valve the first thing pitting affects is the seat face, which is where it seals.
Tell us the fluid when you ask for a price; if it needs another compound, that is a specification and it has to be said before the order is placed.
If you need to know what touches your fluid, the whole list is above.
Factory proof tests. Not a working pressure.
| Item | Value |
|---|---|
| Nominal pressure | PN40 |
| Strength test | 6.0 MPa |
| Seal test | 4.4 MPa |
| Air seal test | 0.6 MPa |
| Working temperature | ≤ 150 °C |
| Medium | General oil, gas and water |
These figures exist to prove the casting and the seal at the factory. Do not design to them.
It is debris on the seat holding it fractionally open. It then passes reverse flow with no sign at all. Fit a Y-strainer upstream.
The body is SS316 and would take far more heat. The figure above is the seat limit.
Body form first, then pressure, then the seat.
A check valve in 1½″–6″ (DN40–DN150) with Wafer, clamped between flanges ends, a SS316 / CF8M body and EPDM seat ring. Rated PN40 at ≤ 150 °C. It stops reverse flow and does not isolate — there is no handle and no way to shut it from outside.
Because one body casting is machined to suit several bolt patterns. This range is offered for seven standards — 150#, 300#, JIS 5K, JIS 10K, PN10, PN16 and PN40 — more than anything else we stock. A 4″ valve is not one product; it is seven, and they do not interchange.
Because each disc is half the diameter and travels a short distance, with a torsion spring already folding it shut as forward flow decays — rather than waiting for full reversal as a single heavy disc does. There is far less moving column to stop. On long lines and high-head pumps that difference is the whole decision.
Yes. A spring closes it, not gravity, so the valve works in any orientation — horizontal at any rotation, vertical up, vertical down. That is the main difference from a swing check valve, which cannot be used on downward flow at all. One rule still applies: flow must follow the arrow.
You will not know from outside, and that is the problem. A check valve fails silently: debris on the seat holds the disc fractionally open and the valve passes reverse flow while looking normal. Fit a Y-strainer upstream, and inspect it when the line is open.
The body is SS316 / CF8M — cast 316, so it resists chlorides far better than 304. The seat is EPDM seat ring. The full parts list is on this page, as printed in the catalogue.
≤ 150 °C, as published. That figure belongs to the seat, not the body — an SS316 body would take far more heat. If your duty is above it, the seat is what changes, and that is a specification to state before the order.
What wears is the seat and the disc face; everything else is a casting, the spring or a fastener. Send the size, the seat type and the callout number and we will match it with the factory.
The test-pressure table is on this page, as printed: nominal PN40, a strength test and a seal test. Those are proof tests, not working pressures — do not design to them.
We hold them in the Singapore and Malaysia warehouses, out within 24 hours of a PO. Quotes within 2 working hours.
Related: swing check valves · Y-strainers · gate valves · ball valves · our videos on YouTube.
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