The Valve,butterfly, cataloged under National Stock Number 4820-01-342-6717, 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 17 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4820-01-342-6717 |
| Primary Part Number | 920-138 6IN |
| Item Name | Valve,butterfly |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Dover Resources, Inc. Div Norriseal |
| Status | ACTIVE |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Flange Face Design | PLAIN ALL ENDS |
| Bolt Circle Nominal Diameter | 9.500 INCHES ALL ENDS IN |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | STRAIGHT THRU FLANGED ENDS |
| Bolt Hole Nominal Diameter | 0.750 INCHES ALL ENDS IN |
| Operating Pressure | 200.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Valve Size | 6.000 INCHES IN |
| Maximum Operating Temp | 180.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Mounting Facility | LUG(S) |
| Bolt Hole Quantity | 8 ALL ENDS |
| Face to Face Distance | 2.125 INCHES IN |
| Material | NICKEL ALLOY FLOW CONTROL DEVICE |
| Material | NICKEL ALLOY SEAT |
| Material | NICKEL ALLOY 400 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 |
|---|---|
| 920-138 6IN PRIMARY | Dover Resources, Inc. Div Norriseal (USA) |
| M3011-645A 6IN PRIMARY | Dover Resources, Inc. Div Norriseal (USA) |
| 920J138 PRIMARY | Dover Resources, Inc. Div Norriseal (USA) |
| Reference | Meaning |
|---|---|
| M3011-645A 6IN | 5/9 Secondary reference U.S. Government activity |
| 920J138 | 5/9 Secondary reference U.S. Government activity |
| 920-138 6IN | 5/9 Secondary reference U.S. Government activity |
NSN 4820-01-342-6717 is a Valve,butterfly, manufactured by Dover Resources, Inc. Div Norriseal, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-342-6717 has 3 manufacturer part numbers on file: 920-138 6IN (Dover Resources, Inc. Div Norriseal), M3011-645A 6IN (Dover Resources, Inc. Div Norriseal), 920J138 (Dover Resources, Inc. Div Norriseal).
Key specifications for 920-138 6IN: Flange Shape: ROUND WITH HOLES ALL ENDS; Flange Face Design: PLAIN ALL ENDS; Bolt Circle Nominal Diameter: 9.500 INCHES ALL ENDS IN; Connection Type: FLANGE ALL ENDS. 17 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.