The Valve,safety Relief, cataloged under National Stock Number 4820-01-478-0990, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Swagelok Co. Government technical data includes 21 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-478-0990 |
| Primary Part Number | SS-4R3A5-F |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Swagelok Co |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Connection Style | PLAIN (PIPE) FIRST END |
| Connection Style | FLARE(TUBE) SECOND END |
| Connection Type | THREADED INTERNAL PIPE SECOND END |
| Connection Type | THREADED EXTERNAL PIPE FIRST END |
| Style Designator | ANGLE |
| Material Document and Classification | ASTMA266, COMP 316 ASSN STD ALL MATERIAL RESPONSES BODY |
| Adjustable Pressure Range | +3000.0 TO 4000.0 POUNDS PER SQUARE INCH LBS |
| Bonnet Type | INSIDE SPRING |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 0.250 INCHES FIRST END IN |
| Nominal Thread Size | 0.250 INCHES SECOND END IN |
| Disk Loading Method | SPRING |
| Bonnet Attachment Method | THREADED |
| Thread Quantity Per Inch | 18 FIRST END |
| Thread Quantity Per Inch | 18 SECOND END |
| Material | STEEL COMP 316 BODY |
| Thread Series Designator | NPT SECOND END |
| Thread Series Designator | NPT FIRST END |
| Opening Pressure Setting | 3600.0 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 |
|---|---|
| 4726-220-RVBA | Hifraser Pty Ltd (AUS) |
| SS-4R3A5-F PRIMARY | Swagelok Co (USA) |
| 2200004 | Ara Marine Pty Ltd (AUS) |
| 515-856 3600 PSI | Rix Industries (USA) |
| Reference | Meaning |
|---|---|
| SS-4R3A5-F | 3/9 Design control — primary reference Nupro Co |
NSN 4820-01-478-0990 is a Valve,safety Relief, manufactured by Swagelok Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-478-0990 has 4 manufacturer part numbers on file: 4726-220-RVBA (Hifraser Pty Ltd), SS-4R3A5-F (Swagelok Co), 2200004 (Ara Marine Pty Ltd), 515-856 3600 PSI (Rix Industries).
Key specifications for SS-4R3A5-F: Flow Control Device: POPPET; Connection Style: PLAIN (PIPE) FIRST END; Connection Style: FLARE(TUBE) SECOND END; Connection Type: THREADED INTERNAL PIPE SECOND END. 21 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.