The Valve,check, cataloged under National Stock Number 4820-01-021-6196, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 19 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-021-6196 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | BALL |
| Connection Style | INVERTED FLARE (TUBE) FIRST END |
| Connection Style | PLAIN (PIPE) SECOND END |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Connection Type | THREADED EXTERNAL PIPE SECOND END |
| Connection Type | THREADED INTERNAL TUBE FIRST END |
| Style Designator | STRAIGHT THRU |
| Nominal Outside Diameter Tube Accommodated | 0.312 INCHES FIRST END IN |
| Thread Direction | RIGHT-HAND SECOND END |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.375 INCHES SECOND END IN |
| Nominal Thread Size | 0.500 INCHES FIRST END IN |
| Seat Angle | 42.0 DEGREES FIRST END |
| Disk Loading Method | SPRING |
| Thread Class | 2B FIRST END |
| Material | STEEL OVERALL |
| Thread Series Designator | NPT SECOND END |
| Thread Series Designator | UNF FIRST END |
| Valve Operation Method | AUTOMATIC |
| 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 |
|---|---|
| 991708 | 5/2 Secondary reference U.S. Government activity |
| 991708 | 5/9 Secondary reference Clark Equipment Co |
| C3AZ7D174A | 5/9 Secondary reference Ford Motor Co Ford Parts and Service Div Government Part Sales |
| C3AZ7D174A | 3/9 Design control — primary reference Ford Motor Company |
NSN 4820-01-021-6196 is a Valve,check, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-021-6196: Flow Control Device: BALL; Connection Style: INVERTED FLARE (TUBE) FIRST END; Connection Style: PLAIN (PIPE) SECOND END; Mounting Position: HORIZONTAL OR VERTICAL. 19 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.