The Diaphragm,actuator Valve,special, cataloged under National Stock Number 4820-00-035-9433, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa. Government technical data includes 10 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-035-9433 |
| Primary Part Number | 11257B |
| Item Name | Diaphragm,actuator Valve,special |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa |
| Status | ACTIVE |
| Outside Diameter | 17.938 INCHES NOMINAL IN |
| Taper Minor Diameter | 8.000 INCHES NOMINAL IN |
| Style Designator | SPECIAL SHAPED |
| Taper Major Diameter | 14.750 INCHES NOMINAL IN |
| Material Thickness | 0.345 INCHES NOMINAL IN |
| Bolt Hole Quantity | 28 |
| Bolt Circle Diameter | 16.125 INCHES NOMINAL IN |
| Center Hole Diameter | 0.678 INCHES NOMINAL IN |
| Material | RUBBER |
| Hole Diameter | 0.665 INCHES NOMINAL IN |
| 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 |
|---|---|
| 11257B PRIMARY | Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa (USA) |
| Reference | Meaning |
|---|---|
| 154 | 5/9 Secondary reference Byron W H Inc a C E Div |
NSN 4820-00-035-9433 is a Diaphragm,actuator Valve,special, manufactured by Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-035-9433 has 1 manufacturer part number on file: 11257B (Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa).
Key specifications for 11257B: Overall Height: 1.750 INCHES NOMINAL IN; Outside Diameter: 17.938 INCHES NOMINAL IN; Taper Minor Diameter: 8.000 INCHES NOMINAL IN; Style Designator: SPECIAL SHAPED. 10 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.