The Valve,safety Relief, cataloged under National Stock Number 4820-00-021-2968, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 18 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-021-2968 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | STEM |
| Furnished Items and Quantity | 1 HANDLE |
| Nominal Pipe Size Accommodated | 0.875 INCHES FIRST END IN |
| Connection Style | PLAIN,OPTIONAL END(PIPE) FIRST END |
| Connection Style | REDUCED SOCKET SECOND END |
| Style Designator | STRAIGHT THRU |
| Material Document and Classification | AISI 30300 ASSN STD 1ST MATERIAL RESPONSE BODY |
| Material Document and Classification | AISI 30300 ASSN STD 2ND MATERIAL RESPONSE STEM |
| Operating Pressure | 6000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.875 INCHES FIRST END IN |
| Maximum Operating Temp | 250.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Thread Class | 2A FIRST END A |
| Thread Quantity Per Inch | 14 FIRST END |
| Material | STEEL COMP 303 STEM |
| Material | STEEL COMP 303 BODY |
| Thread Series Designator | UNF FIRST END |
| Valve Operation Method | MANUAL |
| 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 |
|---|---|
| BC949T-2Q | 3/2 Design control — primary reference U.S. Government activity |
| 2528657 | 5/9 Secondary reference Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
| BC949T | 5/9 Secondary reference U.S. Government activity |
NSN 4820-00-021-2968 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-021-2968: Flow Control Device: STEM; Furnished Items and Quantity: 1 HANDLE; Nominal Pipe Size Accommodated: 0.875 INCHES FIRST END IN; Connection Style: PLAIN,OPTIONAL END(PIPE) FIRST END. 18 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.