The Valve,safety Relief, cataloged under National Stock Number 4820-00-808-9953, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Superior Valve Co. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 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 | 4820-00-808-9953 |
| Primary Part Number | 3002-250 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Superior Valve Co |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Nominal Pipe Size Accommodated | 0.375 INCHES FIRST END IN |
| Connection Style | PLAIN (PIPE) FIRST END |
| Connection Type | THREADED EXTERNAL PIPE FIRST END |
| Style Designator | STRAIGHT THRU |
| Features Provided | VALVE STEM LOCK SHIELD |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.375 INCHES FIRST END IN |
| Disk Loading Method | SPRING |
| Thread Quantity Per Inch | 18 FIRST END |
| Material | COPPER ALLOY OVERALL |
| Thread Series Designator | NPT FIRST END |
| Opening Pressure Setting | 250.0 POUNDS PER SQUARE INCH LBS |
| Valve Discharge Flow Rate | 450.0 POUNDS PER HOUR LBS |
| Valve Operation Method | AUTOMATIC |
| 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 |
|---|---|
| 3002-250 PRIMARY | Superior Valve Co (USA) |
NSN 4820-00-808-9953 is a Valve,safety Relief, manufactured by Superior Valve Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-808-9953 has 1 manufacturer part number on file: 3002-250 (Superior Valve Co).
1 possible match (shared part number, not a government interchangeability claim): 5305-01-101-5578. Verify interchangeability with system specifications before substitution.
Key specifications for 3002-250: Flow Control Device: POPPET; Nominal Pipe Size Accommodated: 0.375 INCHES FIRST END IN; Connection Style: PLAIN (PIPE) FIRST END; Connection Type: THREADED EXTERNAL PIPE FIRST END. 15 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.