The Valve,safety Relief, cataloged under National Stock Number 4820-01-544-7440, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Spx United Kingdom Ltd. Government technical data includes 9 specifications, cited from the U.S. Government catalog. The record lists 2 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4820-01-544-7440 |
| Primary Part Number | 550750100015 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Spx United Kingdom Ltd |
| Status | ACTIVE |
| Connection Style | PLAIN (TUBE) SECOND END |
| Connection Style | FLARED (TUBE) FIRST END |
| Connection Type | THREADED EXTERNAL TUBE FIRST END |
| Connection Type | THREADED INTERNAL TUBE SECOND END |
| Style Designator | ANGLE |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 0.250 INCHES ALL ENDS IN |
| Material | STEEL CORROSION RESISTING BODY |
| Opening Pressure Setting | 70.0 BAR |
| 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 |
|---|---|
| 550750100015 | Spx United Kingdom Ltd (GBR) |
| 550750-01/8 ITEM 3 | Spx United Kingdom Ltd (GBR) |
| Reference | Meaning |
|---|---|
| SS-4R3A5/70BAR | 3/9 Design control — primary reference Nupro Co |
NSN 4820-01-544-7440 is a Valve,safety Relief, manufactured by Spx United Kingdom Ltd, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-544-7440 has 2 manufacturer part numbers on file: 550750100015 (Spx United Kingdom Ltd), 550750-01/8 ITEM 3 (Spx United Kingdom Ltd).
Key specifications for 550750100015: Connection Style: PLAIN (TUBE) SECOND END; Connection Style: FLARED (TUBE) FIRST END; Connection Type: THREADED EXTERNAL TUBE FIRST END; Connection Type: THREADED INTERNAL TUBE SECOND END. 9 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.