The Valve,check, cataloged under National Stock Number 4820-01-075-3425, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Cooper Valve Co Div of Texstream. Government technical data includes 11 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-075-3425 |
| Primary Part Number | 2001AX |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Cooper Valve Co Div of Texstream |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Nominal Pipe Size Accommodated | 1.500 INCHES ALL ENDS IN |
| Connection Style | SOCKET (PIPE) ALL ENDS |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Connection Type | UNTHREADED INTERNAL PIPE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Operating Pressure | 150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Maximum Operating Temp | 150.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | WEIGHT |
| Material | STEEL COMP 316 OVERALL |
| 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 |
|---|---|
| 2001AX PRIMARY | Cooper Valve Co Div of Texstream (USA) |
| Reference | Meaning |
|---|---|
| A35153 1 1/2IN | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| A35153-1 1-2IN | 5/9 Secondary reference U.S. Government activity |
| A-35153 | D/9 Drawing number reference only U.S. Government activity |
| 374-1-1/2 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-01-075-3425 is a Valve,check, manufactured by Cooper Valve Co Div of Texstream, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-075-3425 has 1 manufacturer part number on file: 2001AX (Cooper Valve Co Div of Texstream).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-105-1274, 4820-01-198-3143. Verify interchangeability with system specifications before substitution.
Key specifications for 2001AX: Flow Control Device: DISK; Nominal Pipe Size Accommodated: 1.500 INCHES ALL ENDS IN; Connection Style: SOCKET (PIPE) ALL ENDS; Mounting Position: HORIZONTAL OR VERTICAL. 11 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.