The Valve,calibrated Flow, cataloged under National Stock Number 4820-01-322-2128, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Raytheon Company Div Rmd Strategic. Government technical data includes 11 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-322-2128 |
| Primary Part Number | 721904-8 |
| Item Name | Valve,calibrated Flow |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Raytheon Company Div Rmd Strategic |
| Status | ACTIVE |
| First End Thread Direction | RIGHT-HAND |
| Second End Relationship with First End | IDENTICAL |
| Body Style | STRAIGHT THRU |
| First End Style Designator | PLAIN |
| Temp Rating | 160.0 FAHRENHEIT NOMINAL DEGF |
| End Connection Quantity | 2 |
| First End Connection Type | THREADED INTERNAL PIPE |
| Material | COPPER ALLOY BODY |
| Media for Which Designed | LIQUID, NONCORROSIVE |
| Thread Size and Series/type Designator | 1/2-14 NPT FIRST END |
| Valve Discharge Flow Rate | 3.0 GALLONS PER MINUTE |
| 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 |
|---|---|
| 721904-8 | Raytheon Company Div Rmd Strategic (USA) |
| Reference | Meaning |
|---|---|
| 4-2305-1101 | 3/2 Design control — primary reference U.S. Government activity |
| 721904 | 7/1 Vendor item drawing reference Raytheon Company Div Rmd Strategic |
| 1/2-2305-1101 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-01-322-2128 is a Valve,calibrated Flow, manufactured by Raytheon Company Div Rmd Strategic, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-322-2128 has 1 manufacturer part number on file: 721904-8 (Raytheon Company Div Rmd Strategic).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-322-6644, 6150-01-625-7666. Verify interchangeability with system specifications before substitution.
Key specifications for 721904-8: First End Thread Direction: RIGHT-HAND; Second End Relationship with First End: IDENTICAL; Body Style: STRAIGHT THRU; First End Style Designator: PLAIN. 11 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.