Flanged Gate Valve Dimensions (AWWA C509/C515)
Before you fabricate a pipe spool or order a replacement, you need the gate valve's face-to-face (lay length) and flange drilling. For resilient-wedge water gate valves these are governed by AWWA standards, so dimensions are consistent across manufacturers within a given standard.
C509 vs. C515 — why lay length differs
AWWA C509 is the original full-body resilient-wedge gate valve. AWWA C515 is the reduced-wall version — lighter and often shorter for the same size. The two can have different lay lengths, so always confirm which standard your valve and your existing spool were built to before swapping one for the other.
Flange drilling
Iron-body flanged gate valves are drilled to ASME B16.1 Class 125, which shares the same bolt pattern as ASME B16.5 Class 150 for matching sizes — so they mate with standard 125/150 companion flanges. For the exact bolt circle, bolt count, and bolt size by line size, see our flange bolt-pattern & dimension chart.
What to verify on the datasheet
- Standard: C509 vs. C515 (affects lay length)
- Face-to-face / lay length for the exact size
- End connection: flanged, mechanical joint (MJ), or push-on
- Stem type: OS&Y (rising) vs. NRS (non-rising) — affects vertical clearance
- Operating nut vs. handwheel and overall height when open
Because lay length varies by standard, we publish the governing standard and exact dimensions on each product page rather than a generic table — that's the number that matters for fit.
Related
See the gate valve selection guide to choose wedge and stem type, then browse gate valves. Need a drop-in match for an existing valve? Send us the old valve's standard and lay length and we'll confirm fit.