The Diaphragm,valve,flat, cataloged under National Stock Number 4820-00-651-8612, 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 5 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-00-651-8612 |
| Primary Part Number | 090F01201 |
| Item Name | Diaphragm,valve,flat |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Grove Valve Operations |
| Status | ACTIVE |
| Outside Diameter | 1.125 INCHES NOMINAL IN |
| Style Designator | FLAT |
| Material Thickness | 0.034 INCHES NOMINAL IN |
| Center Hole Diameter | 0.344 INCHES NOMINAL IN |
| Material | 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 |
|---|---|
| 090F01201 PRIMARY | Grove Valve Operations (USA) |
| Reference | Meaning |
|---|---|
| 090F01201 | 5/9 Secondary reference Dresser-Rand Holdings, Llc Dba Dresser-Rand Div Olean Operations |
| 090-01201 | 5/9 Secondary reference Dresser-Rand Holdings, Llc Dba Dresser-Rand Div Olean Operations |
NSN 4820-00-651-8612 is a Diaphragm,valve,flat, manufactured by Grove Valve Operations, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-651-8612 has 1 manufacturer part number on file: 090F01201 (Grove Valve Operations).
1 possible match (shared part number, not a government interchangeability claim): 4310-00-802-3034. Verify interchangeability with system specifications before substitution.
Key specifications for 090F01201: Outside Diameter: 1.125 INCHES NOMINAL IN; Style Designator: FLAT; Material Thickness: 0.034 INCHES NOMINAL IN; Center Hole Diameter: 0.344 INCHES NOMINAL IN. 5 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.