The Valve,butterfly, cataloged under National Stock Number 4820-00-059-9952, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Betts Industries, Inc.. Government technical data includes 12 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-059-9952 |
| Primary Part Number | WD201ALVB |
| Item Name | Valve,butterfly |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Betts Industries, Inc. |
| Status | ACTIVE |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Flange Face Design | PLAIN ALL ENDS |
| Bolt Circle Nominal Diameter | 3.750 INCHES ALL ENDS IN |
| Style Designator | STRAIGHT THRU |
| Bolt Hole Nominal Diameter | 0.442 INCHES ALL ENDS IN |
| Operating Pressure | 200.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Nominal Outside Diameter | 4.500 INCHES ALL ENDS IN |
| Bolt Hole Quantity | 6 ALL ENDS |
| Material | ALUMINUM BODY |
| Material | RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR FLOW CONTROL DEVICE |
| Valve Operation Method | MANUAL |
| Nominal Thickness | 1.128 INCHES ALL ENDS 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 |
|---|---|
| WD201ALVB PRIMARY | Betts Industries, Inc. (USA) |
| Reference | Meaning |
|---|---|
| WD201ALB | 5/9 Secondary reference Heil Environmental Industries |
| WD201ALV | 5/9 Secondary reference Heil Environmental Industries |
| WD21AL | 5/9 Secondary reference Betts Industries, Inc. |
| WD201ALV | 5/9 Secondary reference Betts Industries, Inc. |
NSN 4820-00-059-9952 is a Valve,butterfly, manufactured by Betts Industries, Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-059-9952 has 1 manufacturer part number on file: WD201ALVB (Betts Industries, Inc.).
1 possible match (shared part number, not a government interchangeability claim): 4820-00-606-0120. Verify interchangeability with system specifications before substitution.
Key specifications for WD201ALVB: Flange Shape: ROUND WITH HOLES ALL ENDS; Flange Face Design: PLAIN ALL ENDS; Bolt Circle Nominal Diameter: 3.750 INCHES ALL ENDS IN; Style Designator: STRAIGHT THRU. 12 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.