The Valve,check, cataloged under National Stock Number 4820-01-422-0413, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. Government technical data includes 15 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-422-0413 |
| Primary Part Number | VV81-08C1 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Criticality Code Justification | ZZZY |
| Connection Type | THREADED INTERNAL PIPE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Material Document and Classification | QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | MIL-G-23652 MIL SPEC SINGLE MATERIAL RESPONSE SEAT |
| Operating Pressure | 6000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Nominal Thread Size | 1.750 INCHES ALL ENDS IN |
| Thread Class | 2 ALL ENDS |
| Thread Quantity Per Inch | 12 ALL ENDS |
| Material | NICKEL ALLOY BODY |
| Material | RUBBER FLUOROCARBON CLASS FPM SEAT |
| Thread Series Designator | UN ALL ENDS |
| Valve Operation Method | AUTOMATIC |
| Reference Number Differentiating Characteristics | QUALITY CONTROLLED IAW NAVY LEVEL 1 ASSURANCE GUIDE, CLEANED IAW MIL-C-52211 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| VV81-08C1 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| VV81-08 | 3/1 Design control — primary reference Eaton Corporation Dba Eaton Inoac Div Eaton |
| 190000 | 5/1 Secondary reference Eaton Corporation Dba Eaton Inoac Div Eaton |
NSN 4820-01-422-0413 is a Valve,check, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-422-0413 has 1 manufacturer part number on file: VV81-08C1 (Naval Inventory Control Point Mechanicsburg).
Key specifications for VV81-08C1: Flow Control Device: POPPET; Criticality Code Justification: ZZZY; Connection Type: THREADED INTERNAL PIPE ALL ENDS; Style Designator: STRAIGHT THRU. 15 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.
NSN 4820-01-422-0413 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.