The Valve,safety Relief, cataloged under National Stock Number 4820-01-656-7843, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Scott Industrial Systems, Inc. Government technical data includes 15 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-656-7843 |
| Primary Part Number | 28001-206-10 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Scott Industrial Systems, Inc |
| Status | ACTIVE |
| Connection Style | FLARED (TUBE) SECOND END |
| Connection Style | FLARE(TUBE) FIRST END |
| Minimum Operating Temp | -40.0 FAHRENHEIT DEGF |
| Connection Type | THREADED INTERNAL BOSS FIRST END |
| Connection Type | THREADED EXTERNAL TUBE SECOND END |
| Style Designator | STRAIGHT THRU NOTE: TO BE USED FOR VALVE BODIES OF ONE SECTION ONLY. |
| Operating Pressure | 3500.00 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Nominal Thread Size | 0.5625 INCHES ALL ENDS IN |
| Seat Angle | 37.00 DEGREES SECOND END |
| Seat Angle | 45.00 DEGREES FIRST END |
| Maximum Operating Temp | 250.00 FAHRENHEIT SINGLE RESPONSE DEGF |
| Face to Face Distance | 2.90 INCHES IN |
| Thread Quantity Per Inch | 18 ALL ENDS |
| Material | STEEL BODY |
| 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 |
|---|---|
| 28001-206-10 | Scott Industrial Systems, Inc (USA) |
| Reference | Meaning |
|---|---|
| 28001-206-10 | 3/9 Design control — primary reference Vonberg Valve, Inc. |
NSN 4820-01-656-7843 is a Valve,safety Relief, manufactured by Scott Industrial Systems, Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-656-7843 has 1 manufacturer part number on file: 28001-206-10 (Scott Industrial Systems, Inc).
Key specifications for 28001-206-10: Connection Style: FLARED (TUBE) SECOND END; Connection Style: FLARE(TUBE) FIRST END; Minimum Operating Temp: -40.0 FAHRENHEIT DEGF; Connection Type: THREADED INTERNAL BOSS 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.
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.