The Valve,regulating,fluid Pressure, cataloged under National Stock Number 4820-01-331-6648, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 22 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-331-6648 |
| Item Name | Valve,regulating,fluid Pressure |
| 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 | 13.000 INCHES NOMINAL IN |
| Regulation Type | AUTOMATIC SINGLE STAGE |
| First End Flange Thickness | 1.125 INCHES NOMINAL IN |
| First End Flange Outside Diameter | 7.500 INCHES NOMINAL IN |
| First End Style Designator | RAISED |
| Temp Rating | 775.0 FAHRENHEIT NOMINAL DEGF |
| First End Raised Face Diameter | 4.125 INCHES NOMINAL IN |
| Material Document and Classification | QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| End Connection Quantity | 2 |
| Valve Loading Method | SPRING |
| Specification/standard Data | 81349-MIL-V-17848C GOVERNMENT SPECIFICATION |
| Nondefinitive Spec/std Data | A CLASS AND D COMPOSITION AND 2.50IPS SIZE |
| First End Connection Type | RAISED FACE FLANGE |
| First End Flange Shape Style | ROUND |
| First End Raised Face Height | 0.250 INCHES NOMINAL IN |
| Material | STEEL SEAT |
| Material | NICKEL ALLOY FLOW CONTROL DEVICE |
| Maximum Inlet Pressure Rating | ERR-060 |
| Filter | NOT INCLUDED |
| 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 |
|---|---|
| NAP943 | 3/9 Design control — primary reference Atlas Valve Co |
| MIL-V-17848 | 4/1 Identification reference U.S. Government activity |
| MIL-V-17848C | 5/9 Secondary reference U.S. Government activity |
NSN 4820-01-331-6648 is a Valve,regulating,fluid Pressure, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-331-6648: Flow Control Device: DIAPHRAGM; Second End Relationship with First End: IDENTICAL; Body Style: STRAIGHT THRU; Face to Face Distance: 13.000 INCHES NOMINAL IN. 22 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.