The Seat,valve, cataloged under National Stock Number 4820-01-284-5986, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Newmans Inc New Jersey Div. Government technical data includes 2 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-284-5986 |
| Primary Part Number | MV-31F 1 1/2 ITEM 2 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Newmans Inc New Jersey Div |
| Status | ACTIVE |
| Hardness Rating | 38.0 ROCKWELL C MINIMUM SEAT |
| Material | STEEL SEAT |
| 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 |
|---|---|
| MV-31F 1 1/2 ITEM 2 PRIMARY | Newmans Inc New Jersey Div (USA) |
| Reference | Meaning |
|---|---|
| MV-31F 1 1/2 | D/9 Drawing number reference only Newmans Inc New Jersey Div |
NSN 4820-01-284-5986 is a Seat,valve, manufactured by Newmans Inc New Jersey Div, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-284-5986 has 1 manufacturer part number on file: MV-31F 1 1/2 ITEM 2 (Newmans Inc New Jersey Div).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-285-1426. Verify interchangeability with system specifications before substitution.
Key specifications for MV-31F 1 1/2 ITEM 2: Hardness Rating: 38.0 ROCKWELL C MINIMUM SEAT; Special Features: HARDFACING-STELLITE NO. 6; FOR CLASS 150 SWING CHECK TYPE; Material: STEEL SEAT. 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.