The Valve,safety Relief, cataloged under National Stock Number 4820-01-189-0803, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Dover Corp Groen Div. Government technical data includes 7 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. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-189-0803 |
| Primary Part Number | 50562 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Dover Corp Groen Div |
| Status | ACTIVE |
| Flow Control Device | DISKDISK |
| Connection Type | THREADED INTERNAL PIPE ALL ENDS |
| Nominal Thread Size | 2.750 INCHES FIRST END IN |
| Material | CHROMIUM BODY |
| Thread Series Designator | NPT FIRST END |
| Opening Pressure Setting | 50.0 POUNDS PER SQUARE INCH LBS |
| Valve Operation Method | AUTOMATICAUTOMATIC |
| 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 |
|---|---|
| 50562 PRIMARY | Dover Corp Groen Div (USA) |
NSN 4820-01-189-0803 is a Valve,safety Relief, manufactured by Dover Corp Groen Div, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-189-0803 has 1 manufacturer part number on file: 50562 (Dover Corp Groen Div).
2 possible matches (shared part number, not a government interchangeability claim): 6615-01-327-3128, 5821-01-480-3056. Verify interchangeability with system specifications before substitution.
Key specifications for 50562: Flow Control Device: DISKDISK; Connection Type: THREADED INTERNAL PIPE ALL ENDS; Nominal Thread Size: 2.750 INCHES FIRST END IN; Material: CHROMIUM BODY. 7 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.