The Valve,stop-Check, cataloged under National Stock Number 4820-01-420-4121, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Andritz Naf Ab. Government technical data includes 9 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-420-4121 |
| Primary Part Number | FK30.70(2)GB 526530 DN350 SST |
| Item Name | Valve,stop-Check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Andritz Naf Ab |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Connection Style | GROOVED (DROP-IN CARTRIDGE) ALL ENDS |
| Mounting Position | HORIZONTAL |
| Connection Type | UNTHREADED CARTRIDGE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Bonnet Type | INSIDE SPRING |
| Bonnet Attachment Method | INTEGRAL |
| Material | STEEL BODY |
| 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 |
|---|---|
| FK30.70(2)GB 526530 DN350 SST PRIMARY | Andritz Naf Ab (SWE) |
| 526530 DN350 SST | Andritz Naf Ab (SWE) |
| Reference | Meaning |
|---|---|
| FK30.70(2)GB 526530 DN350 SST | 3/9 Design control — primary reference Naf Ab |
| 526530 DN350 SST | 5/9 Secondary reference Naf Ab |
NSN 4820-01-420-4121 is a Valve,stop-Check, manufactured by Andritz Naf Ab, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-420-4121 has 2 manufacturer part numbers on file: FK30.70(2)GB 526530 DN350 SST (Andritz Naf Ab), 526530 DN350 SST (Andritz Naf Ab).
Key specifications for FK30.70(2)GB 526530 DN350 SST: Flow Control Device: DISK; Connection Style: GROOVED (DROP-IN CARTRIDGE) ALL ENDS; Mounting Position: HORIZONTAL; Connection Type: UNTHREADED CARTRIDGE ALL ENDS. 9 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.