The Valve,check, cataloged under National Stock Number 4820-00-034-1707, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Hartford Compressors 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-034-1707 |
| Primary Part Number | 6411-062 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Hartford Compressors Inc |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Connection Style | FLARED (TUBE) ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Nominal Outside Diameter Tube Accommodated | 0.500 INCHES ALL ENDS IN |
| Operating Pressure | 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 0.750 INCHES ALL ENDS IN |
| Seat Angle | 37.0 DEGREES ALL ENDS |
| Disk Loading Method | SPRING |
| Thread Class | 3A ALL ENDS A |
| Material | STEEL BODY |
| Material | STEEL SEAT |
| Material | STEEL FLOW CONTROL DEVICE |
| Thread Series Designator | UNF ALL ENDS |
| 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 |
|---|---|
| 6411-062 | Hartford Compressors Inc (USA) |
| Reference | Meaning |
|---|---|
| 6411-062 | 3/2 Design control — primary reference U.S. Government activity |
| CV500-22-65 | 3/2 Design control — primary reference U.S. Government activity |
| L6594-6 | 5/9 Secondary reference Pettibone Llc |
NSN 4820-00-034-1707 is a Valve,check, manufactured by Hartford Compressors Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-034-1707 has 1 manufacturer part number on file: 6411-062 (Hartford Compressors Inc).
Key specifications for 6411-062: Flow Control Device: POPPET; Connection Style: FLARED (TUBE) ALL ENDS; Style Designator: STRAIGHT THRU; Nominal Outside Diameter Tube Accommodated: 0.500 INCHES ALL ENDS IN. 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.