The Valve,calibrated Flow, cataloged under National Stock Number 4820-01-644-4520, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 18 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-644-4520 |
| Item Name | Valve,calibrated Flow |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | DIAPHRAGM |
| Second End Relationship with First End | IDENTICAL |
| Body Style | STRAIGHT THRU |
| Face to Face Distance | 12.0 INCHES NOMINAL IN |
| First End Style Designator | SOCKET W/BRAZING RING |
| Temp Rating | 160.0 FAHRENHEIT MAXIMUM DEGF |
| Material Document and Classification | ASTM B62 ASSN STD SINGLE MATERIAL RESPONSE LOCATION NOT OTHERWISE SPECIFIED |
| End Connection Quantity | 2 |
| Valve Size | 1.5 INCHES IN |
| First End Connection Type | UNTHREADED INTERNAL PIPE |
| First End Nominal Pipe Size Accommodated | 1.5 INCHES IN |
| Material | RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR FLOW CONTROL DEVICE |
| Material | COPPER ALLOY OR COPPER ALLOY 836 BODY |
| Media for Which Designed | WATER |
| Maximum Inlet Pressure Rating | ERR-060 |
| Furnished Items | ADAPTER AND BRAZING RING AND NUT AND TAILPIECE W/GROOVES AND UNION NUT |
| End Connection Spec/std | MIL-F-1183 |
| Valve Discharge Flow Rate | 90.0 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 |
| Reference | Meaning |
|---|---|
| 2745-B14 REV.15 2352-1531AB | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 2352-1531AB | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-644-4520 is a Valve,calibrated Flow, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-644-4520: Flow Control Device: DIAPHRAGM; Second End Relationship with First End: IDENTICAL; Body Style: STRAIGHT THRU; Face to Face Distance: 12.0 INCHES NOMINAL IN. 18 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.