The Valve,check, cataloged under National Stock Number 4820-01-581-6934, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Hydro Mechanical Systems Inc. Government technical data includes 1 specification, 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 | 4820-01-581-6934 |
| Primary Part Number | D-1602 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Hydro Mechanical Systems Inc |
| Status | ACTIVE |
| Material | STEEL OVERALL |
| 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 |
|---|---|
| D-1602 PRIMARY | Hydro Mechanical Systems Inc (USA) |
NSN 4820-01-581-6934 is a Valve,check, manufactured by Hydro Mechanical Systems Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-581-6934 has 1 manufacturer part number on file: D-1602 (Hydro Mechanical Systems Inc).
Key specifications for D-1602: Special Features: MODEL S10, CONNECTION 1/2 INCH NPTF IN; Part Name Assigned by Controlling Agency: SUPPLY PRESSURE CONTROL VALVE; Material: STEEL OVERALL. 1 specification is 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.