The Valve,safety Relief, cataloged under National Stock Number 4820-01-322-2113, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Raytheon Company Div Rmd Strategic. 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-322-2113 |
| Primary Part Number | 721966-1 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Raytheon Company Div Rmd Strategic |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Renewable Seat Ring Type | PRESSED-IN |
| Connection Style | PLAIN (PIPE) FIRST END |
| Connection Type | THREADED EXTERNAL PIPE FIRST END |
| Style Designator | STRAIGHT THRU |
| Operating Pressure | 200.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Features Provided | PRESSURE TIGHT OUTLET SIDE |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.250 INCHES FIRST END IN |
| Maximum Operating Temp | 450.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Media for Which Designed | OXYGEN, GASEOUS THIRD RESPONSE |
| Media for Which Designed | OIL, CHLORINATED TRANSFORMER SECOND RESPONSE |
| Media for Which Designed | AIR FIRST RESPONSE |
| Material | COPPER ALLOY BODY |
| Material | COPPER ALLOY FLOW CONTROL DEVICE |
| Material | RUBBER SILICONE CLASS Q PACKING |
| Material | COPPER ALLOY SEAT |
| Thread Series Designator | NPT FIRST END |
| Opening Pressure Setting | 0.8 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 |
|---|---|
| 721966-1 | Raytheon Company Div Rmd Strategic (USA) |
| Reference | Meaning |
|---|---|
| 524B-2M-8 | 3/2 Design control — primary reference U.S. Government activity |
| 524B-2M-08 | 5/9 Secondary reference U.S. Government activity |
| 721966 | 7/1 Vendor item drawing reference Raytheon Company Div Rmd Strategic |
NSN 4820-01-322-2113 is a Valve,safety Relief, manufactured by Raytheon Company Div Rmd Strategic, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-322-2113 has 1 manufacturer part number on file: 721966-1 (Raytheon Company Div Rmd Strategic).
Key specifications for 721966-1: Flow Control Device: POPPET; Renewable Seat Ring Type: PRESSED-IN; Connection Style: PLAIN (PIPE) FIRST END; Connection Type: THREADED EXTERNAL PIPE 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.