The Valve,check, cataloged under National Stock Number 4820-00-781-6899, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 15 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-781-6899 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Connection Style | EXTERNAL SEAT FOR GASKET SEAL (BOSS) FIRST END |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Connection Type | THREADED EXTERNAL BOSS FIRST END |
| Style Designator | STRAIGHT THRU |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 2.312 INCHES FIRST END IN |
| Disk Loading Method | SPRING |
| Thread Class | 2A FIRST END A |
| Thread Quantity Per Inch | 12 FIRST END |
| Material | NICKEL ALLOY 400 BODY |
| Material | RUBBER SEAT |
| Thread Series Designator | UNS FIRST END |
| Valve Operation Method | AUTOMATIC |
| Reference Number Differentiating Characteristics | QUALITY ASSURANCE TESTING IN ACCORDANCE WITH NAVY LEVEL 1 ASSURANCE GUIDE |
| 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 |
|---|---|
| 2620-908X6ASSYJ | 5/1 Secondary reference U.S. Government activity |
| C32935L1 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 2620-908X6ASSYJL1 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 2620-908X6ASSYJ | 5/9 Secondary reference U.S. Government activity |
| C32935 | 3/1 Design control — primary reference Eaton Corporation Dba Eaton Inoac Div Eaton |
NSN 4820-00-781-6899 is a Valve,check, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-781-6899: Flow Control Device: DISK; Connection Style: EXTERNAL SEAT FOR GASKET SEAL (BOSS) FIRST END; Mounting Position: HORIZONTAL OR VERTICAL; Connection Type: THREADED EXTERNAL BOSS FIRST END. 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.
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.