The Disk,valve, cataloged under National Stock Number 4820-01-127-2567, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Dover Pumps & Process Solutions Segment Inc Dba Blackmer Div Blackmer. Government technical data includes 5 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-127-2567 |
| Primary Part Number | 451420 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Dover Pumps & Process Solutions Segment Inc Dba Blackmer Div Blackmer |
| Status | ACTIVE |
| Shank Diameter | 0.841 INCHES NOMINAL IN |
| Flange Diameter | 2.246 INCHES NOMINAL IN |
| Style Designator | POPPET |
| Seat Angle | 45.0 DEGREES NOMINAL |
| Material | COPPER ALLOY |
| 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 |
|---|---|
| 451420 PRIMARY | Dover Pumps & Process Solutions Segment Inc Dba Blackmer Div Blackmer (USA) |
| Reference | Meaning |
|---|---|
| E3497 | D/9 Drawing number reference only Dover Pumps & Process Solutions Segment Inc Dba Blackmer Div Blackmer |
| E3497 PIECE 9 | 5/9 Secondary reference Dover Pumps & Process Solutions Segment Inc Dba Blackmer Div Blackmer |
NSN 4820-01-127-2567 is a Disk,valve, manufactured by Dover Pumps & Process Solutions Segment Inc Dba Blackmer Div Blackmer, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-127-2567 has 1 manufacturer part number on file: 451420 (Dover Pumps & Process Solutions Segment Inc Dba Blackmer Div Blackmer).
1 possible match (shared part number, not a government interchangeability claim): 4320-01-252-7471. Verify interchangeability with system specifications before substitution.
Key specifications for 451420: Shank Diameter: 0.841 INCHES NOMINAL IN; Flange Diameter: 2.246 INCHES NOMINAL IN; Overall Height: 1.885 INCHES NOMINAL IN; Style Designator: POPPET. 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.