The Valve,restrictor Check, cataloged under National Stock Number 4820-01-557-0023, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 4 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-557-0023 |
| Item Name | Valve,restrictor Check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Connection Style | PLAIN (TUBE) ALL ENDS |
| Connection Type | UNTHREADED CARTRIDGE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| 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 |
|---|---|
| 6395130-03 FIND 006 | 5/1 Secondary reference Naval Sea Systems Command |
| 6395130-02 FIND 006 | 5/1 Secondary reference Naval Sea Systems Command |
| FLFA5001315D | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-557-0023 is a Valve,restrictor Check, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-557-0023: Connection Style: PLAIN (TUBE) ALL ENDS; Connection Type: UNTHREADED CARTRIDGE ALL ENDS; Style Designator: STRAIGHT THRU; Special Features: NHA: HYDRAULIC FLOW CONTROL ASSEMBLY, 6395130. 4 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.