The Valve,check, cataloged under National Stock Number 4820-00-133-1795, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Rtx Corporation Div Pratt & Whitney. Government technical data includes 20 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-133-1795 |
| Primary Part Number | 101920-0 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Rtx Corporation Div Pratt & Whitney |
| Status | ACTIVE |
| Flow Control Device | BALL |
| Connection Style | FLARED (TUBE) FIRST END |
| Connection Style | INVERTED FLARE (TUBE) SECOND END |
| Style Designator | ANGLE |
| Nominal Outside Diameter Tube Accommodated | 0.375 INCHES FIRST END IN |
| Nominal Outside Diameter Tube Accommodated | 0.250 INCHES SECOND END IN |
| Thread Direction | RIGHT-HAND SECOND END |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.438 INCHES SECOND END IN |
| Nominal Thread Size | 0.562 INCHES FIRST END IN |
| Seat Angle | 45.0 DEGREES SECOND END |
| Seat Angle | 37.0 DEGREES FIRST END |
| Thread Class | 3A FIRST END A |
| Thread Class | 3A SECOND END A |
| Thread Quantity Per Inch | 20 SECOND END |
| Thread Quantity Per Inch | 18 FIRST END |
| Material | COPPER ALLOY OVERALL |
| Thread Series Designator | UNF FIRST END |
| Thread Series Designator | UNF SECOND 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 |
| Part Number | Manufacturer |
|---|---|
| 101920-0 PRIMARY | Rtx Corporation Div Pratt & Whitney (USA) |
NSN 4820-00-133-1795 is a Valve,check, manufactured by Rtx Corporation Div Pratt & Whitney, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-133-1795 has 1 manufacturer part number on file: 101920-0 (Rtx Corporation Div Pratt & Whitney).
Key specifications for 101920-0: Flow Control Device: BALL; Connection Style: FLARED (TUBE) FIRST END; Connection Style: INVERTED FLARE (TUBE) SECOND END; Style Designator: ANGLE. 20 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.