The Seat,valve, cataloged under National Stock Number 4820-01-084-2591, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Hunt Valve Company, Inc.. Government technical data includes 6 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-084-2591 |
| Primary Part Number | ST-1946 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Hunt Valve Company, Inc. |
| Status | ACTIVE |
| Body Outside Diameter | 2.753 INCHES NOMINAL IN |
| Style Designator | PLAIN |
| Body Inside Diameter | 2.068 INCHES NOMINAL IN |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE OVERALL |
| Seat Angle in Deg | 45.000 NOMINAL |
| Seating Surface Shape | ANGULAR |
| 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 |
|---|---|
| M-1861A SHEET 1 PIECE 10 | Hunt Valve Company, Inc. (USA) |
| ST-1946 PRIMARY | Hunt Valve Company, Inc. (USA) |
| Reference | Meaning |
|---|---|
| ST-1946 | 5/9 Secondary reference Morland Valve Co Inc Sub of Smith Valve Corp |
| M-1861A SHEET 1 PIECE 10 | 5/9 Secondary reference Morland Valve Co Inc Sub of Smith Valve Corp |
NSN 4820-01-084-2591 is a Seat,valve, manufactured by Hunt Valve Company, Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-084-2591 has 2 manufacturer part numbers on file: M-1861A SHEET 1 PIECE 10 (Hunt Valve Company, Inc.), ST-1946 (Hunt Valve Company, Inc.).
1 possible match (shared part number, not a government interchangeability claim): 5331-01-125-9041. Verify interchangeability with system specifications before substitution.
Key specifications for ST-1946: Overall Height: 0.245 INCHES NOMINAL IN; Body Outside Diameter: 2.753 INCHES NOMINAL IN; Style Designator: PLAIN; Body Inside Diameter: 2.068 INCHES NOMINAL IN. 6 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.