The Valve,safety Relief, cataloged under National Stock Number 4820-01-563-2676, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 12 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-563-2676 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Bolt Circle Nominal Diameter | 11.750 INCHES ALL ENDS IN |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | ANGLE FLANGED ENDS |
| Bolt Hole Nominal Diameter | 0.438 INCHES ALL ENDS IN |
| Valve Size | 8.000 INCHES IN |
| Second Connection Face to Centerline Distance | 8.000 INCHES IN |
| Nominal Outside Diameter | 13.500 INCHES ALL ENDS IN |
| Bolt Hole Quantity | 8 ALL ENDS |
| First Connection Face to Centerline Distance | 12.000 INCHES IN |
| Valve Operation Method | AUTOMATIC |
| Nominal Thickness | 1.130 INCHES ALL ENDS IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 203932 | D/9 Drawing number reference only U.S. Government activity |
| 204135-01F | 3/2 Design control — primary reference U.S. Government activity |
| 203932-01C,FIND1 | 5/2 Secondary reference U.S. Government activity |
NSN 4820-01-563-2676 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4820-01-563-2682. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-563-2676: Flange Shape: ROUND WITH HOLES ALL ENDS; Bolt Circle Nominal Diameter: 11.750 INCHES ALL ENDS IN; Connection Type: FLANGE ALL ENDS; Style Designator: ANGLE FLANGED ENDS. 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.