The Valve,butterfly, cataloged under National Stock Number 4820-01-310-4263, 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 14 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-310-4263 |
| Primary Part Number | 1095990 R285B-166AA-2TM 24IN |
| Item Name | Valve,butterfly |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Dover Resources, Inc. Div Norriseal |
| Status | ACTIVE |
| Style Designator | STRAIGHT THRU FLANGED ENDS |
| Material Document and Classification | ASTM A395 ALLOY 60-40-18 ASSN STD SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | QQ-S-288 COMP A OR E FED SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Operating Pressure | 250.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Valve Size | 24.000 INCHES IN |
| Maximum Operating Temp | 250.0 FAHRENHEIT SECOND RESPONSE DEGF |
| Maximum Operating Temp | -35.0 FAHRENHEIT FIRST RESPONSE DEGF |
| Mounting Facility | LUG(S) |
| Face to Face Distance | 36.500 INCHES IN |
| Material | NICKEL ALLOY FLOW CONTROL DEVICE |
| Material | RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR PACKING |
| Material | NICKEL STEM |
| 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 |
|---|---|
| 1095990 R285B-166AA-2TM 24IN PRIMARY | Dover Resources, Inc. Div Norriseal (USA) |
| Reference | Meaning |
|---|---|
| R285B-166AA-2PM/920T180 24 IN | 5/9 Secondary reference Dover Resources, Inc. Div Norriseal |
| R285B-166AA-2PM/920T180 24 IN | 3/9 Design control — primary reference U.S. Government activity |
| 920T180 | 5/9 Secondary reference Dover Resources, Inc. Div Norriseal |
| 920T180 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-01-310-4263 is a Valve,butterfly, manufactured by Dover Resources, Inc. Div Norriseal, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-310-4263 has 1 manufacturer part number on file: 1095990 R285B-166AA-2TM 24IN (Dover Resources, Inc. Div Norriseal).
Key specifications for 1095990 R285B-166AA-2TM 24IN: Style Designator: STRAIGHT THRU FLANGED ENDS; Material Document and Classification: ASTM A395 ALLOY 60-40-18 ASSN STD SINGLE MATERIAL RESPONSE BODY; Material Document and Classification: QQ-S-288 COMP A OR E FED SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE; Operating Pressure: 250.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS. 14 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.