The Seat,valve, cataloged under National Stock Number 4810-00-513-8147, is classified within Federal Supply Class 4810 (Valves, Powered) of the Valves group. The manufacturer of record is Automatic Switch Company Dba Asco. Government technical data includes 12 specifications, cited from the U.S. Government catalog. The record lists 10 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4810-00-513-8147 |
| Primary Part Number | FV20-786A |
| Item Name | Seat,valve |
| FSC / FSG | 4810 / 48 — Valves, Powered |
| Manufacturer | Automatic Switch Company Dba Asco |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.094 INCHES NOMINAL IN |
| Flange Diameter | 0.500 INCHES NOMINAL IN |
| Thread Length | 0.203 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Style Designator | THREADED FLANGED |
| Body Inside Diameter | 0.188 INCHES NOMINAL IN |
| Nominal Thread Size | 0.438 INCHES SINGLE THREADED PORTION IN |
| Under Flange Height | 0.390 INCHES NOMINAL IN |
| Thread Class | 2A SINGLE THREADED PORTION A |
| Material | STEEL OVERALL |
| Seat Angle in Deg | 0.500 NOMINAL |
| Thread Series Designator | UNF SINGLE THREADED PORTION |
| Seating Surface Shape | ANGULAR |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| GV63-360REVAPC56 | Automatic Switch Company Dba Asco (USA) |
| FV20-786A PRIMARY | Automatic Switch Company Dba Asco (USA) |
| GV48-357REVAPC37 | Automatic Switch Company Dba Asco (USA) |
| AV46-240PC37 PRIMARY | Automatic Switch Company Dba Asco (USA) |
| GV52-816REVAPC56 | Automatic Switch Company Dba Asco (USA) |
| GV46-261PC37 PRIMARY | Automatic Switch Company Dba Asco (USA) |
| FV20-786 PRIMARY | Automatic Switch Company Dba Asco (USA) |
| 575-4824-1487470PC37 PRIMARY | Naval Sea Systems Command (USA) |
| 597-200-1886964REVAPC56 | Naval Sea Systems Command (USA) |
| AV46-280PC56 | Automatic Switch Company Dba Asco (USA) |
| Reference | Meaning |
|---|---|
| 578-5103-1674702REVAPC56 | 5/2 Secondary reference U.S. Government activity |
| 576-4824-1506685REVAPC37 | 5/2 Secondary reference U.S. Government activity |
| 3278953PC56 | 5/2 Secondary reference U.S. Government activity |
NSN 4810-00-513-8147 is a Seat,valve, manufactured by Automatic Switch Company Dba Asco, classified under FSC 4810, Valves, Powered. Status: active.
NSN 4810-00-513-8147 has 10 manufacturer part numbers on file: GV63-360REVAPC56 (Automatic Switch Company Dba Asco), FV20-786A (Automatic Switch Company Dba Asco), GV48-357REVAPC37 (Automatic Switch Company Dba Asco), AV46-240PC37 (Automatic Switch Company Dba Asco), GV52-816REVAPC56 (Automatic Switch Company Dba Asco) and 5 more.
1 possible match (shared part number, not a government interchangeability claim): 4810-01-197-2796. Verify interchangeability with system specifications before substitution.
Key specifications for FV20-786A: Flange Seat to Disk End Height: 0.094 INCHES NOMINAL IN; Flange Diameter: 0.500 INCHES NOMINAL IN; Thread Length: 0.203 INCHES NOMINAL SINGLE THREADED PORTION IN; Style Designator: THREADED FLANGED. 12 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.