The Seat,valve, cataloged under National Stock Number 4820-01-218-3412, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Portland Valve Llc. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Seat,valve |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Manufacturers | Portland Valve Llc (CAGE 53154) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-218-3412 |
| Primary Part Number | 102-0031-3C |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Portland Valve Llc |
| Status | ACTIVE |
| 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 |
|---|---|
| D4711 ITEM 5 | Portland Valve Llc (USA) |
| 102-0031-3C PRIMARY | Portland Valve Llc (USA) |
| Reference | Meaning |
|---|---|
| 102-0031-1A | 5/9 Secondary reference Portland Valve Llc |
| D4711 | D/9 Drawing number reference only Portland Valve Llc |
| 102-0031-1A | 5/9 Secondary reference Lin-Act Mfg Co |
| 102-0031-3C | 5/9 Secondary reference Lin-Act Mfg Co |
NSN 4820-01-218-3412 is a Seat,valve, manufactured by Portland Valve Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-218-3412 has 2 manufacturer part numbers on file: D4711 ITEM 5 (Portland Valve Llc), 102-0031-3C (Portland Valve Llc).
4 possible matches (shared part number, not a government interchangeability claim): 4820-01-218-3560, 4820-01-218-3715, 4820-01-244-8436. Verify interchangeability with system specifications before substitution.
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.