The Valve,safety Relief, cataloged under National Stock Number 4820-00-050-6403, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 15 specifications, cited from the U.S. Government catalog. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-050-6403 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Renewable Seat Ring Type | THREADED |
| Nominal Pipe Size Accommodated | 0.250 INCHES FIRST END IN |
| Connection Style | SOCKET WITH BRAZING RING FIRST END |
| Criticality Code Justification | ZZZY |
| Style Designator | ANGLE |
| Adjustable Pressure Range | +15.0 TO 18.0 POUNDS PER SQUARE INCH LBS |
| Bonnet Type | INSIDE SPRING |
| Disk Loading Method | SPRING |
| Bonnet Attachment Method | BOLTED |
| Material | NICKEL ALLOY 400 OR NICKEL ALLOY R-405 STEM |
| Material | NICKEL ALLOY 400 OR NICKEL ALLOY R-405 SEAT |
| Material | COPPER ALLOY 922 BODY |
| Valve Operation Method | AUTOMATIC |
| Reference Number Differentiating Characteristics | QUALITY CONTROL IAW NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR SUBSAFE ITEM; ALSO REQUIRES SPECIAL CLEANING AND PACKAGING FOR OXYGEN AND NITROGEN SERVICE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Reference | Meaning |
|---|---|
| 86100X175T19-1-4 | 5/1 Secondary reference Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
| GS6I0C51MCL | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 86100X175T19-1-4C1 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| GS6I0C51MC1 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 0XE8610C51MC1 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 0XE8610C51M | 3/1 Design control — primary reference Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
NSN 4820-00-050-6403 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-050-6403: Flow Control Device: DISK; Renewable Seat Ring Type: THREADED; Nominal Pipe Size Accommodated: 0.250 INCHES FIRST END IN; Connection Style: SOCKET WITH BRAZING RING FIRST END. 15 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 4820-00-050-6403 has DEMIL Code B. 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.