The Seat,valve, cataloged under National Stock Number 4820-01-343-7312, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 4 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 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 | 4820-01-343-7312 |
| Primary Part Number | 211055783 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Body Outside Diameter | 4.480 INCHES NOMINAL IN |
| Style Designator | PLAIN |
| Body Inside Diameter | 3.060 INCHES NOMINAL IN |
| Seating Surface Shape | O-RING |
| 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 |
|---|---|
| 801-6408784 FIND 144 | Naval Sea Systems Command (USA) |
| DF330644 FIND 144 | Naval Sea Systems Command (USA) |
| 211055783 PRIMARY | Naval Sea Systems Command (USA) |
NSN 4820-01-343-7312 is a Seat,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-343-7312 has 3 manufacturer part numbers on file: 801-6408784 FIND 144 (Naval Sea Systems Command), DF330644 FIND 144 (Naval Sea Systems Command), 211055783 (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-529-2977. Verify interchangeability with system specifications before substitution.
Key specifications for 211055783: Overall Height: 0.563 INCHES NOMINAL IN; Body Outside Diameter: 4.480 INCHES NOMINAL IN; Style Designator: PLAIN; Body Inside Diameter: 3.060 INCHES NOMINAL IN. 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.