The Seat,valve, cataloged under National Stock Number 4820-01-270-6434, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Dover Resources, Inc. Div Norriseal. Government technical data includes 5 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-270-6434 |
| Primary Part Number | 51729D002 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Dover Resources, Inc. Div Norriseal |
| Status | ACTIVE |
| Style Designator | PLAIN |
| Material Document and Classification | QQ-N-288 COMP A OR E FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Body Inside Diameter | 2.500 INCHES NOMINAL IN |
| Material | NICKEL ALLOY OVERALL |
| Seating Surface Shape | FLAT |
| 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 |
|---|---|
| 51729D002 | Dover Resources, Inc. Div Norriseal (USA) |
| 911-558 REF.5 | Dover Resources, Inc. Div Norriseal (USA) |
| Reference | Meaning |
|---|---|
| 51729D002 | 3/9 Design control — primary reference U.S. Government activity |
| 911-558 REF.5 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-01-270-6434 is a Seat,valve, manufactured by Dover Resources, Inc. Div Norriseal, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-270-6434 has 2 manufacturer part numbers on file: 51729D002 (Dover Resources, Inc. Div Norriseal), 911-558 REF.5 (Dover Resources, Inc. Div Norriseal).
Key specifications for 51729D002: Style Designator: PLAIN; Material Document and Classification: QQ-N-288 COMP A OR E FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Body Inside Diameter: 2.500 INCHES NOMINAL IN; Material: NICKEL ALLOY OVERALL. 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.