The Valve,stop-Check, cataloged under National Stock Number 4820-00-039-5151, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Derbyshire Machine & Tool Co. Government technical data includes 10 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-039-5151 |
| Primary Part Number | U129 |
| Item Name | Valve,stop-Check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Derbyshire Machine & Tool Co |
| Status | ACTIVE |
| Furnished Items and Quantity | 2 NUT |
| Nominal Pipe Size Accommodated | 1.000 INCHES FIRST END IN |
| Connection Style | SOCKET WITH BRAZING RING (PIPE) FIRST END |
| Style Designator | ANGLE |
| Operating Pressure | 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Features Provided | VALVE STEM LOCK SHIELD |
| Bonnet Type | INSIDE SCREW |
| Disk Loading Method | SPRING |
| Bonnet Attachment Method | THREADED |
| Valve Operation Method | MANUAL |
| 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 |
|---|---|
| U129 | Derbyshire Machine & Tool Co (USA) |
| Reference | Meaning |
|---|---|
| 490604PCAA3T0J3 | 3/2 Design control — primary reference U.S. Government activity |
| 42051PCAA3T0J3 | 5/2 Secondary reference U.S. Government activity |
| 282-4900-801834REVCPCV26 | 5/2 Secondary reference U.S. Government activity |
NSN 4820-00-039-5151 is a Valve,stop-Check, manufactured by Derbyshire Machine & Tool Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-039-5151 has 1 manufacturer part number on file: U129 (Derbyshire Machine & Tool Co).
Key specifications for U129: Furnished Items and Quantity: 2 NUT; Nominal Pipe Size Accommodated: 1.000 INCHES FIRST END IN; Connection Style: SOCKET WITH BRAZING RING (PIPE) FIRST END; Style Designator: ANGLE. 10 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.