The Valve,safety Relief, cataloged under National Stock Number 4820-01-088-2874, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 30 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4820-01-088-2874 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Furnished Items and Quantity | 1 DEFLECTOR CAP |
| Surface Treatment Document and Classification | MIL-A-8625,TYPE 1,CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE LOCATION NOT OTHERWISE SPECIFIED |
| Connection Style | PLAIN (TUBE) FIRST END |
| Connection Type | THREADED EXTERNAL TUBE FIRST END |
| Style Designator | STRAIGHT THRU W/BAFFLE |
| Material Document and Classification | QQ-A-225/6,ALLOY 2024,T4 FED SPEC SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | QQ-A-225/6,ALLOY 2024,T4 FED SPEC SINGLE MATERIAL RESPONSE SEAT |
| Material Document and Classification | QQ-S-764,TYPE 303-CANCELED FED SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Operating Pressure | 200.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.750 INCHES FIRST END IN |
| Maximum Operating Temp | 280.0 FAHRENHEIT SECOND RESPONSE DEGF |
| Maximum Operating Temp | -40.0 FAHRENHEIT FIRST RESPONSE DEGF |
| Disk Loading Method | SPRING |
| Surface Treatment | ANODIZE LOCATION NOT OTHERWISE SPECIFIED |
| Media for Which Designed | HELIUM FIFTH RESPONSE |
| Media for Which Designed | FUEL/OIL, HYDROCARBON FOURTH RESPONSE |
| Media for Which Designed | ALCOHOL, ETHYL SECOND RESPONSE |
| Media for Which Designed | AMMONIA, GASEOUS THIRD RESPONSE |
| Media for Which Designed | AIR FIRST RESPONSE |
| Thread Class | 3A FIRST END A |
| Thread Quantity Per Inch | 16 FIRST END |
| Material | STEEL COMP 303 FLOW CONTROL DEVICE |
| Material | ALUMINUM ALLOY 2024 BODY |
| Material | ALUMINUM ALLOY 2024 SEAT |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) FIRST END |
| Opening Pressure Setting | 45.0 POUNDS PER SQUARE INCH LBS |
| Valve Discharge Flow Rate | 40.0 CUBIC FEET PER MINUTE |
| Valve Operation Method | AUTOMATIC |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 581R855H01 | 3/2 Design control — primary reference U.S. Government activity |
| 581R55H01 | 3/2 Design control — primary reference U.S. Government activity |
| 581R855 | D/9 Drawing number reference only U.S. Government activity |
NSN 4820-01-088-2874 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-088-2874: Flow Control Device: POPPET; Furnished Items and Quantity: 1 DEFLECTOR CAP; Surface Treatment Document and Classification: MIL-A-8625,TYPE 1,CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE LOCATION NOT OTHERWISE SPECIFIED; Connection Style: PLAIN (TUBE) FIRST END. 30 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.
NSN 4820-01-088-2874 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.