Type a line (series 14 DN 150, globe valve DN 80, measured 290 mm DN 65), or pick the type, the DN and the series. Below, an offered valve can be checked against the length wanted.
Checks the face-to-face length, the DN and the type only: the pressure rating, material and ends are checked separately, and the valve’s data sheet and a measurement on site decide.
The face-to-face length of a flanged valve is set by the EN 558 basic series: within a series, every valve of a given DN has the same length, whoever makes it. Type a series and DN (“EN 558 series 1 DN 100”), a valve type and DN (“gate valve DN 150”) or a measured gap and DN (“measured 350 mm DN 100”), and the finder gives the series, the valve it is typical for and the length in mm, draws the valve between the flanges to scale, shows the series across DN and the DN across series, checks an offered valve and writes an RFQ line.
This is reference data: the valve’s data sheet and a measurement on site decide. A length is given only where two independent sources give the same figure; where they differ, or only one gives it, the length is left out. ASME B16.10 (Class) face-to-face lengths are not covered.
A series is a set of face-to-face lengths by DN. Its number alone does not say what the valve is: series 14 and series 27 give the same lengths up to DN 100, and gate valves are made to series 14 (short body) as well as series 15 (long body). Series 1, 14 and 15 match the former DIN 3202 F1, F4 and F5.
Without a data sheet, measure between the sealing faces of the pipe flanges with the valve out, or the valve itself from flange face to flange face. Gaskets add to the face-to-face length unless the valve seat seals against the flange. The finder looks for series within 2 mm of the measurement.
A valve with a different face-to-face length does not fit the existing gap without work on the pipe: a shorter valve needs a spacer piece or a re-spooled pipe, a longer one a pipe cut back. That is why a request gives the series and the length in mm. The flange identifier gives flange dimensions, and the valve marking reader explains the marks on the body.
| DN | Series 1 | Series 10 | Series 14 | Series 15 | Series 20 | Series 27 |
|---|---|---|---|---|---|---|
| DN 15 | 130 | — | 115 | — | — | 115 |
| DN 20 | 150 | — | 120 | — | — | 120 |
| DN 25 | 160 | — | 125 | — | — | 125 |
| DN 32 | 180 | — | 130 | — | — | 130 |
| DN 40 | 200 | — | 140 | 240 | — | 140 |
| DN 50 | 230 | 203 | 150 | 250 | 43 | 150 |
| DN 65 | 290 | 216 | 170 | 270 | 46 | 170 |
| DN 80 | 310 | 241 | 180 | 280 | 46 | 180 |
| DN 100 | 350 | 292 | 190 | 300 | 52 | 190 |
| DN 125 | 400 | 330 | 200 | 325 | 56 | 325 |
| DN 150 | 480 | 356 | 210 | 350 | 56 | 350 |
| DN 200 | 600 | 495 | 230 | 400 | 60 | 400 |
| DN 250 | 730 | 622 | 250 | 450 | 68 | — |
| DN 300 | 850 | 698 | 270 | 500 | 78 | — |
A dash marks a length that two independent sources do not confirm. Left out: series 15 at DN 25 and 32 (two tables that may share one origin give 120 and 140 mm, far shorter than series 15 from DN 40, and at DN 25 even shorter than series 14); series 20 at DN 40 and series 10 at DN 15 to 40 (one source each); series 27 at DN 250 and 300 (no source checked gives them); DN 10 and the sizes above DN 300; the ASME B16.10 lengths. A measured gap is matched to a series length within 2 mm either way.
| Series | Typical for | DN on this page | Former designation |
|---|---|---|---|
| 1 | Globe valves, straight pattern | DN 15–300 | DIN 3202 F1 |
| 10 | Swing check valves | DN 50–300 | — |
| 14 | Gate valves, short body | DN 15–300 | DIN 3202 F4 |
| 15 | Gate valves, long body | DN 40–300 | DIN 3202 F5 |
| 20 | Wafer butterfly valves | DN 50–300 | — |
| 27 | Ball valves | DN 15–200 | — |
The use shown is where at least two sources agree; a maker may build a valve to a different series, so the valve’s data sheet decides. Swing check valves are also made to other series, and wafer and dual-plate check valves and double-flanged butterfly valves have lengths of their own: they are not covered here.
A summary table of the EN 558 basic series by a control valve maker; the face-to-face tables and data sheets of makers of gate valves, ball valves, butterfly valves and check valves that state an EN 558 series. Every length on this page is in at least two of them; the text of EN 558 is not quoted.
It is the length of the valve from one flange face to the other: the length that sits in the gap between the pipe flanges. EN 558 groups these lengths into basic series. Within a series, every valve of a given DN has the same length, whoever makes it, so a valve to the same series and DN fits the same gap. The gaskets add to this length.
In the maker tables checked: series 1 for straight-pattern globe valves, series 14 (short body) and series 15 (long body) for gate valves, series 20 for wafer butterfly valves, series 10 for swing check valves and series 27 for ball valves. These are typical uses, not rules: a maker may build a valve to a different series, so the valve’s own data sheet decides.
Measure the gap between the sealing faces of the pipe flanges with the valve out and take off the gasket thickness, or measure the valve itself from flange face to flange face. Enter the length and the DN, for example measured 350 mm DN 100: the finder lists the series whose length is within 2 mm of it. Where two series share a length (series 14 and 27 up to DN 100), the valve type tells them apart.
It does not fit the existing gap without work on the pipe: a shorter valve leaves a gap to close with a spacer piece or by re-spooling, and a longer valve needs the pipe cut back. Both are changes to the pipework, so ask for a valve to the same series and DN, or give the measured length in the request.
No. ASME B16.10 gives face-to-face lengths of its own for Class-rated valves, and they differ from the EN 558 series used for PN valves. They are not given here; for an ASME valve, give the measured length and the size in the request.
A length is shown only where two independent sources give the same figure. Left out: series 15 at DN 25 and 32 (two tables that may share one origin give figures far shorter than series 15 from DN 40, at DN 25 even shorter than series 14); series 20 at DN 40 and series 10 at DN 15 to 40 (one source each); series 27 at DN 250 and 300 (no source checked gives them); DN 10 and the sizes above DN 300.
The valve type, the DN and the PN, the EN 558 basic series with the length in mm (or the measured gap), the body material, the ends (flanged to EN 1092-1 and the PN), the operation (handwheel, lever or actuator), the quantity, and a photograph of the valve and of its nameplate or body marking.
Finding the length is a check against tables, not the valve’s data sheet. Attach a photograph of the valve and its nameplate, and the measured gap, and Vessel Core checks them before an offer goes back.
