The Valve,check, cataloged under National Stock Number 4820-00-044-0543, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Clark Equipment Co Div Doosan Infracore Portable Power. Government technical data includes 16 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-044-0543 |
| Primary Part Number | 2W86657 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Clark Equipment Co Div Doosan Infracore Portable Power |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Renewable Seat Ring Type | THREADED |
| Connection Style | PLAIN, OPTIONAL END (PIPE) ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Operating Pressure | 300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SECOND RESPONSE LBS |
| Operating Pressure | 150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FIRST RESPONSE LBS |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 1.250 INCHES ALL ENDS IN |
| Maximum Operating Temp | 406.0 FAHRENHEIT FIRST RESPONSE DEGF |
| Maximum Operating Temp | 100.0 FAHRENHEIT SECOND RESPONSE DEGF |
| Disk Loading Method | WEIGHT |
| Media for Which Designed | WATER-OIL-GAS SECOND RESPONSE |
| Media for Which Designed | STEAM FIRST RESPONSE |
| Material | COPPER ALLOY OVERALL |
| Thread Series Designator | NPT 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 |
|---|---|
| 2W86657 PRIMARY | Clark Equipment Co Div Doosan Infracore Portable Power (USA) |
| Reference | Meaning |
|---|---|
| FIG N0. T433-Y | C/1 Advisory reference — outside the item-of-supply concept Nibco Inc |
| FIG NO. T433-Y 1 1-4 | 5/9 Secondary reference Nibco Inc |
| 2W88543 | 5/9 Secondary reference Ingersoll Rand Co |
| 2W86657 | 5/9 Secondary reference Ingersoll Rand Co |
NSN 4820-00-044-0543 is a Valve,check, manufactured by Clark Equipment Co Div Doosan Infracore Portable Power, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-044-0543 has 1 manufacturer part number on file: 2W86657 (Clark Equipment Co Div Doosan Infracore Portable Power).
Key specifications for 2W86657: Flow Control Device: DISK; Renewable Seat Ring Type: THREADED; Connection Style: PLAIN, OPTIONAL END (PIPE) ALL ENDS; Style Designator: STRAIGHT THRU. 16 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.