The Valve,globe, cataloged under National Stock Number 4820-01-220-6593, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is The Walworth Company. Government technical data includes 23 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-220-6593 |
| Primary Part Number | A9879-M-16 LESS BYPASS |
| Item Name | Valve,globe |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | The Walworth Company |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Flange Face Design | RAISED STRAIGHT ALL ENDS |
| Bolt Circle Nominal Diameter | 11.500 INCHES ALL ENDS IN |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | STRAIGHT THRU FLANGED ENDS |
| Material Document and Classification | AISI TYPE 410 ASSN STD SINGLE MATERIAL RESPONSE STEM |
| Material Document and Classification | ASTM A-217,WC-6 ASSN STD SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | ASTM A-217,WC-6 ASSN STD SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Bolt Hole Nominal Diameter | 1.125 INCHES ALL ENDS IN |
| Valve Size | 6.000 INCHES IN |
| Bonnet Type | OUTSIDE SCREW-YOKE |
| Nominal Outside Diameter | 14.000 INCHES ALL ENDS IN |
| Bolt Hole Quantity | 12 ALL ENDS |
| Bonnet Attachment Method | PRESSURE SEAL, RING TYPE |
| Face to Face Distance | 18.000 INCHES IN |
| Material | STEEL BODY |
| Material | STEEL FLOW CONTROL DEVICE |
| Material | STEEL CORROSION RESISTING STEM |
| Raised Face Nominal Diameter | 8.500 INCHES IN |
| Valve Operation Method | MANUAL |
| Raised Face Nominal Height | 0.250 INCHES IN |
| Nominal Thickness | 1.969 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 |
|---|---|
| A9879-M-16 LESS BYPASS PRIMARY | The Walworth Company (USA) |
| Reference | Meaning |
|---|---|
| A9879-M-16 | D/9 Drawing number reference only The Walworth Company |
NSN 4820-01-220-6593 is a Valve,globe, manufactured by The Walworth Company, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-220-6593 has 1 manufacturer part number on file: A9879-M-16 LESS BYPASS (The Walworth Company).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-220-7033. Verify interchangeability with system specifications before substitution.
Key specifications for A9879-M-16 LESS BYPASS: Flow Control Device: DISK; Flange Shape: ROUND WITH HOLES ALL ENDS; Flange Face Design: RAISED STRAIGHT ALL ENDS; Bolt Circle Nominal Diameter: 11.500 INCHES ALL ENDS IN. 23 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.