The Valve,safety Relief, cataloged under National Stock Number 4820-01-517-4795, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Doering Co. Government technical data includes 17 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-517-4795 |
| Primary Part Number | 82H227MOS1SS/S-8502-6 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Doering Co |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Flange Shape | HEXAGON ALL ENDS |
| Connection Style | GASKET SEAL(BOSS) ALL ENDS |
| Nominal Length | 3.250 INCHES ALL ENDS IN |
| Connection Type | THREADED EXTERNAL BOSS ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Operating Pressure | 5000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 0.750 INCHES ALL ENDS IN |
| Maximum Operating Temp | 200.0 FAHRENHEIT SECOND RESPONSE DEGF |
| Maximum Operating Temp | -45.0 FAHRENHEIT FIRST RESPONSE DEGF |
| Disk Loading Method | SPRING |
| Thread Quantity Per Inch | 16 ALL ENDS |
| Material | ALUMINUM BODY |
| Thread Series Designator | NPT ALL ENDS |
| Valve Operation Method | MANUAL |
| Nominal Thickness | 1.500 INCHES ALL ENDS IN |
| 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 |
|---|---|
| 82H227MOS1SS/S-8502-6 PRIMARY | Doering Co (USA) |
| 6304524-5 | Appleton Marine Inc (USA) |
| Reference | Meaning |
|---|---|
| 6304524-5 | 5/2 Secondary reference U.S. Government activity |
| 6304524 | D/9 Drawing number reference only U.S. Government activity |
NSN 4820-01-517-4795 is a Valve,safety Relief, manufactured by Doering Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-517-4795 has 2 manufacturer part numbers on file: 82H227MOS1SS/S-8502-6 (Doering Co), 6304524-5 (Appleton Marine Inc).
1 possible match (shared part number, not a government interchangeability claim): 2530-01-517-5730. Verify interchangeability with system specifications before substitution.
Key specifications for 82H227MOS1SS/S-8502-6: Flow Control Device: POPPET; Flange Shape: HEXAGON ALL ENDS; Connection Style: GASKET SEAL(BOSS) ALL ENDS; Nominal Length: 3.250 INCHES ALL ENDS IN. 17 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.