The Valve,calibrated Flow, cataloged under National Stock Number 4820-01-538-8710, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 8 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-538-8710 |
| Item Name | Valve,calibrated Flow |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | DIAPHRAGM |
| Body Style | STRAIGHT THRU |
| Face to Face Distance | 9.750 INCHES NOMINAL IN |
| End Connection Quantity | 2 |
| Specification/standard Data | 81348 - QQ-C-390B GOVERNMENT SPECIFICATION |
| Nondefinitive Spec/std Data | 836 ALLOY |
| Material | COPPER ALLOY BODY |
| Valve Discharge Flow Rate | 29.0 IMPERIAL 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 |
|---|---|
| 1682-B FIG NO 2353-1342A | 5/2 Secondary reference U.S. Government activity |
| 2353-1342A 1.50 X 1.25IN | 3/2 Design control — primary reference U.S. Government activity |
| 1682-B | D/9 Drawing number reference only U.S. Government activity |
NSN 4820-01-538-8710 is a Valve,calibrated Flow, classified under FSC 4820, Valves, Nonpowered. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 4820-01-625-7995, 4820-01-670-9944, 4820-01-695-5415. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-538-8710: Flow Control Device: DIAPHRAGM; Body Style: STRAIGHT THRU; Face to Face Distance: 9.750 INCHES NOMINAL IN; End Connection Quantity: 2. 8 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.