The Diaphragm,valve,flat, cataloged under National Stock Number 4820-01-199-4988, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Grove Valve Operations. Government technical data includes 2 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-199-4988 |
| Primary Part Number | 090-02022 |
| Item Name | Diaphragm,valve,flat |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Grove Valve Operations |
| Status | ACTIVE |
| Material Document and Classification | LOCKHEED-CALIFORNIA CO, C-22-1221 MFR REF SINGLE MATERIAL RESPONSE |
| Material | RUBBER AND PLASTIC POLYAMIDE NYLON |
| 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 |
|---|---|
| W-829-A02 ITEM 4 | Grove Valve Operations (USA) |
| 090-02022 PRIMARY | Grove Valve Operations (USA) |
| Reference | Meaning |
|---|---|
| W-829-A02 | D/9 Drawing number reference only Grove Valve Operations |
NSN 4820-01-199-4988 is a Diaphragm,valve,flat, manufactured by Grove Valve Operations, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-199-4988 has 2 manufacturer part numbers on file: W-829-A02 ITEM 4 (Grove Valve Operations), 090-02022 (Grove Valve Operations).
1 possible match (shared part number, not a government interchangeability claim): 4730-01-199-5860. Verify interchangeability with system specifications before substitution.
Key specifications for 090-02022: Material Document and Classification: LOCKHEED-CALIFORNIA CO, C-22-1221 MFR REF SINGLE MATERIAL RESPONSE; Material: RUBBER AND PLASTIC POLYAMIDE NYLON. 2 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.