The Valve,butterfly, cataloged under National Stock Number 4820-01-312-0281, 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 9 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-312-0281 |
| Primary Part Number | R285A147BB-2RM |
| Item Name | Valve,butterfly |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Dover Resources, Inc. Div Norriseal |
| Status | ACTIVE |
| Style Designator | STRAIGHT THRU |
| Operating Pressure | 285.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Valve Size | 8.000 INCHES IN |
| Mounting Facility | WAFER |
| Material | STEEL STEM |
| Material | RUBBER SEAT |
| Material | COPPER ALLOY 954 FLOW CONTROL DEVICE |
| Material | IRON CAST UNS F32800 BODY |
| Valve Operation Method | MANUAL |
| 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 |
|---|---|
| R285A147BB-2RM | Dover Resources, Inc. Div Norriseal (USA) |
| Reference | Meaning |
|---|---|
| R285A-147BB-2MM/920K177 | 5/9 Secondary reference U.S. Government activity |
| R285A-147BB-2RM | 3/2 Design control — primary reference U.S. Government activity |
| 59121J146 | 5/2 Secondary reference U.S. Government activity |
NSN 4820-01-312-0281 is a Valve,butterfly, manufactured by Dover Resources, Inc. Div Norriseal, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-312-0281 has 1 manufacturer part number on file: R285A147BB-2RM (Dover Resources, Inc. Div Norriseal).
Key specifications for R285A147BB-2RM: Style Designator: STRAIGHT THRU; Operating Pressure: 285.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS; Valve Size: 8.000 INCHES IN; Mounting Facility: WAFER. 9 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.