The Valve,safety Relief, cataloged under National Stock Number 4820-00-478-3319, 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26 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-478-3319 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | POPPETPOPPET |
| 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 |
| Style Designator | STRAIGHT THRU NOTE: TO BE USED FOR VALVE BODIES OF ONE SECTION ONLY. |
| Material Document and Classification | QQ-S-764,TYPE 416,COND H-CANCELED FED SPEC 1ST MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Material Document and Classification | QQ-S-764,TYPE 416,COND H-CANCELED FED SPEC 1ST MATERIAL RESPONSE FLOW CONTROL DEVICEQQ-S-764,TYPE 416,COND H-CANCELED FED SPEC SINGLE MATERIAL RESPONSE SEAT |
| Material Document and Classification | QQ-S-764,TYPE 416,COND H-CANCELED FED SPEC SINGLE MATERIAL RESPONSE SEATQQ-S-764,TYPE 416,COND H-CANCELED FED SPEC SINGLE MATERIAL RESPONSE BODY |
| Operating Pressure | 200.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Thread Direction | RIGHT-HAND ALL ENDSRIGHT-HAND ALL ENDS |
| Nominal Thread Size | 0.250 INCHES ALL ENDS0.250 INCHES ALL ENDS IN |
| Maximum Operating Temp | -40.0 FAHRENHEIT FIRST RESPONSE-40.0 FAHRENHEIT FIRST RESPONSE DEGF |
| Maximum Operating Temp | 250.0 FAHRENHEIT SECOND RESPONSE250.0 FAHRENHEIT SECOND RESPONSE DEGF |
| Disk Loading Method | SPRINGSPRING |
| Media for Which Designed | HYDROGEN FIFTH RESPONSE |
| Media for Which Designed | ACETYLENE SECOND RESPONSEAIR FIRST RESPONSE |
| Media for Which Designed | AMMONIA, GASEOUS THIRD RESPONSEACETYLENE SECOND RESPONSE |
| Media for Which Designed | HYDROGEN FIFTH RESPONSEREFRIGERANT 12 FOURTH RESPONSE |
| Media for Which Designed | REFRIGERANT 12 FOURTH RESPONSEAMMONIA, GASEOUS THIRD RESPONSE |
| Material | STEEL COMP 416 AND RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR FLOW CONTROL DEVICE |
| Material | STEEL COMP 416 SEATSTEEL COMP 416 AND RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR FLOW CONTROL DEVICE |
| Material | STEEL COMP 416 SEATSTEEL COMP 416 BODY |
| Thread Series Designator | NPT ALL ENDS |
| Opening Pressure Setting | 5.0 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 |
|---|---|
| 559T-2MP-5 | 3/2 Design control — primary reference U.S. Government activity |
| 2587006 | 1/2 Source control — Government-approved source U.S. Government activity |
NSN 4820-00-478-3319 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-478-3319: Flow Control Device: POPPETPOPPET; 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. 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.