The Valve,check, cataloged under National Stock Number 4820-01-533-1539, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Clean Earth Environmental Group Inc.. Government technical data includes 9 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-533-1539 |
| Primary Part Number | 5274-0607-20B/C-5274-0607-20B |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Clean Earth Environmental Group Inc. |
| Status | ACTIVE |
| Nominal Pipe Size Accommodated | 2.000 INCHES ALL ENDS IN |
| Connection Style | SOCKET (PIPE) ALL ENDS |
| Connection Type | UNTHREADED EXTERNAL PIPE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Operating Pressure | 150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Media for Which Designed | FUEL/OIL, HYDROCARBON SINGLE RESPONSE |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE FLOW CONTROL DEVICE |
| Material | STEEL CORROSION RESISTING 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 |
|---|---|
| 5274-0607-20B/C-5274-0607-20B PRIMARY | Clean Earth Environmental Group Inc. (USA) |
| Reference | Meaning |
|---|---|
| C-5274-0607-20B | D/9 Drawing number reference only Clean Earth Environmental Group Inc. |
NSN 4820-01-533-1539 is a Valve,check, manufactured by Clean Earth Environmental Group Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-533-1539 has 1 manufacturer part number on file: 5274-0607-20B/C-5274-0607-20B (Clean Earth Environmental Group Inc.).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-533-1763. Verify interchangeability with system specifications before substitution.
Key specifications for 5274-0607-20B/C-5274-0607-20B: Nominal Pipe Size Accommodated: 2.000 INCHES ALL ENDS IN; Connection Style: SOCKET (PIPE) ALL ENDS; Connection Type: UNTHREADED EXTERNAL PIPE ALL ENDS; Style Designator: STRAIGHT THRU. 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.