The Valve,safety Relief, cataloged under National Stock Number 4820-01-216-4652, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Northrop Grumman Corp Electronic Systems Defensive System Div. Government technical data includes 20 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-216-4652 |
| Primary Part Number | 1V0005-001 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Northrop Grumman Corp Electronic Systems Defensive System Div |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE LOCATION NOT OTHERWISE SPECIFIED |
| Connection Style | EXTERNAL SEAT FOR GASKET SEAL (BOSS) FIRST END |
| Connection Type | THREADED EXTERNAL BOSS FIRST END |
| Style Designator | STRAIGHT THRU W/BAFFLE |
| Material Document and Classification | ASTM A582 ASSN STD SINGLE MATERIAL RESPONSE OR QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE BODY |
| Operating Pressure | 35.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 0.438 INCHES ALL ENDS IN |
| Maximum Operating Temp | 125.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | SPRING |
| Surface Treatment | PASSIVATE LOCATION NOT OTHERWISE SPECIFIED |
| Media for Which Designed | NITROGEN, GASEOUS FIRST RESPONSE |
| Media for Which Designed | HELIUM SECOND RESPONSE |
| Media for Which Designed | REFRIGERANT 12 THIRD RESPONSE |
| Thread Class | 2A ALL ENDS A |
| Material | STEEL COMP 303 BODY |
| Thread Series Designator | UNF ALL ENDS |
| Opening Pressure Setting | 20.0 POUNDS PER SQUARE INCH 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 |
|---|---|
| 1V0005-001 PRIMARY | Northrop Grumman Corp Electronic Systems Defensive System Div (USA) |
NSN 4820-01-216-4652 is a Valve,safety Relief, manufactured by Northrop Grumman Corp Electronic Systems Defensive System Div, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-216-4652 has 1 manufacturer part number on file: 1V0005-001 (Northrop Grumman Corp Electronic Systems Defensive System Div).
Key specifications for 1V0005-001: Flow Control Device: POPPET; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE LOCATION NOT OTHERWISE SPECIFIED; Connection Style: EXTERNAL SEAT FOR GASKET SEAL (BOSS) FIRST END; Connection Type: THREADED EXTERNAL BOSS FIRST END. 20 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.