The Valve,butterfly, cataloged under National Stock Number 4820-01-355-6295, 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 8 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4820-01-355-6295 |
| Primary Part Number | 920L220 |
| Item Name | Valve,butterfly |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Dover Resources, Inc. Div Norriseal |
| Status | ACTIVE |
| Style Designator | STRAIGHT THRU |
| Material Document and Classification | QQ-N-288, COMP A FED SPEC SINGLE MATERIAL RESPONSE OR QQ-N-288, COMP E FED SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Valve Size | 10.000 INCHES IN |
| Material | NICKEL ALLOY STEM |
| Material | NICKEL ALLOY FLOW CONTROL DEVICE |
| Material | RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR SEAT |
| Material | NICKEL ALLOY 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 |
|---|---|
| 920L220 PRIMARY | Dover Resources, Inc. Div Norriseal (USA) |
| Reference | Meaning |
|---|---|
| 920L220 | 5/9 Secondary reference U.S. Government activity |
| 920-220 | D/9 Drawing number reference only U.S. Government activity |
| 10"R285C-666AA-2MM | 3/9 Design control — primary reference U.S. Government activity |
NSN 4820-01-355-6295 is a Valve,butterfly, manufactured by Dover Resources, Inc. Div Norriseal, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-355-6295 has 1 manufacturer part number on file: 920L220 (Dover Resources, Inc. Div Norriseal).
Key specifications for 920L220: Style Designator: STRAIGHT THRU; Material Document and Classification: QQ-N-288, COMP A FED SPEC SINGLE MATERIAL RESPONSE OR QQ-N-288, COMP E FED SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE; Valve Size: 10.000 INCHES IN; Material: NICKEL ALLOY STEM. 8 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.