The Valve,calibrated Flow, cataloged under National Stock Number 4820-01-449-1980, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 12 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-449-1980 |
| Primary Part Number | 801-6405539-AY90 |
| Item Name | Valve,calibrated Flow |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Flow Control Device | STEM AND INTEGRAL DISK |
| Second End Relationship with First End | IDENTICAL |
| Body Style | STRAIGHT THRU |
| Face to Face Distance | 6.880 INCHES NOMINAL IN |
| First End Style Designator | REDUCED SOCKET |
| Temp Rating | 160.0 FAHRENHEIT MAXIMUM DEGF |
| End Connection Quantity | 2 |
| Manual Control Method | KNOB |
| First End Connection Type | UNTHREADED INTERNAL PIPE |
| First End Nominal Pipe Size Accommodated | 0.750 INCHES IN |
| Media for Which Designed | HYDRAULIC FLUID, PETROLEUM BASE |
| Maximum Inlet Pressure Rating | ERR-060 |
| 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 |
|---|---|
| 801-6405539-AY90 PRIMARY | Naval Sea Systems Command (USA) |
| 211038648 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 801-6405539-AY9 | C/1 Advisory reference — outside the item-of-supply concept Naval Inventory Control Point Mechanicsburg |
| 6405539 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 4820-01-449-1980 is a Valve,calibrated Flow, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-449-1980 has 2 manufacturer part numbers on file: 801-6405539-AY90 (Naval Sea Systems Command), 211038648 (Naval Sea Systems Command).
Key specifications for 801-6405539-AY90: Flow Control Device: STEM AND INTEGRAL DISK; Second End Relationship with First End: IDENTICAL; Body Style: STRAIGHT THRU; Face to Face Distance: 6.880 INCHES NOMINAL IN. 12 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.