The Valve,safety Relief, cataloged under National Stock Number 4820-00-297-0002, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 26 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4820-00-297-0002 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | POPPETPOPPET |
| Nominal Pipe Size Accommodated | 0.250 INCHES SECOND END0.250 INCHES SECOND END IN |
| Nominal Pipe Size Accommodated | 0.250 INCHES FIRST END0.250 INCHES FIRST END IN |
| Connection Style | PLAIN,OPTIONAL END(PIPE) SECOND ENDPLAIN,OPTIONAL END(PIPE) SECOND END |
| Connection Style | PLAIN (PIPE) FIRST ENDPLAIN (PIPE) FIRST END |
| Connection Type | THREADED INTERNAL PIPE SECOND ENDTHREADED INTERNAL PIPE SECOND END |
| Connection Type | THREADED EXTERNAL PIPE FIRST ENDTHREADED EXTERNAL PIPE FIRST END |
| Material Document and Classification | QQ-S-764,TYPE303-CANCELED FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Operating Pressure | 200.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Features Provided | PRESSURE TIGHT OUTLET SIDEPRESSURE TIGHT OUTLET SIDE |
| Thread Direction | RIGHT-HAND SECOND ENDRIGHT-HAND SECOND END |
| Thread Direction | RIGHT-HAND FIRST ENDRIGHT-HAND FIRST END |
| Nominal Thread Size | 0.250 INCHES SECOND END0.250 INCHES SECOND END IN |
| Nominal Thread Size | 0.250 INCHES FIRST END0.250 INCHES FIRST END IN |
| Maximum Operating Temp | -70.0 FAHRENHEIT FIRST RESPONSE-70.0 FAHRENHEIT FIRST RESPONSE DEGF |
| Maximum Operating Temp | 450.0 FAHRENHEIT SECOND RESPONSE450.0 FAHRENHEIT SECOND RESPONSE DEGF |
| Disk Loading Method | SPRINGSPRING |
| Media for Which Designed | OXYGEN, GASEOUS THIRD RESPONSE |
| Media for Which Designed | OIL, CHLORINATED TRANSFORMER SECOND RESPONSEAIR FIRST RESPONSE |
| Media for Which Designed | OXYGEN, GASEOUS THIRD RESPONSEOIL, CHLORINATED TRANSFORMER SECOND RESPONSE |
| Thread Quantity Per Inch | 18 SECOND END18 SECOND END |
| Material | STEEL COMP 303 OVERALL |
| Thread Series Designator | NPT SECOND END |
| Thread Series Designator | NPT SECOND ENDNPT FIRST END |
| Opening Pressure Setting | 14.0 POUNDS PER SQUARE INCH LBS |
| Valve Operation Method | AUTOMATICAUTOMATIC |
| 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 |
|---|---|
| 524T-2MP-14 | 3/2 Design control — primary reference U.S. Government activity |
| 885C878P0002 | 7/9 Vendor item drawing reference U.S. Government activity |
| 885C878P2 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-00-297-0002 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-297-0002: Flow Control Device: POPPETPOPPET; Nominal Pipe Size Accommodated: 0.250 INCHES SECOND END0.250 INCHES SECOND END IN; Nominal Pipe Size Accommodated: 0.250 INCHES FIRST END0.250 INCHES FIRST END IN; Connection Style: PLAIN,OPTIONAL END(PIPE) SECOND ENDPLAIN,OPTIONAL END(PIPE) SECOND END. 26 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.