The Valve,check, cataloged under National Stock Number 4820-01-473-4222, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Hunt Valve Company, Inc.. Government technical data includes 15 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-473-4222 |
| Primary Part Number | 21-4 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Hunt Valve Company, Inc. |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Flange Face Design | PLAIN ALL ENDS |
| Bolt Circle Nominal Diameter | 1.125 INCHES ALL ENDS IN |
| Mounting Position | HORIZONTAL |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | STRAIGHT THRU FLANGED ENDS |
| Bolt Hole Nominal Diameter | 1.125 INCHES ALL ENDS IN |
| Valve Size | 16.000 INCHES IN |
| Center to Center Nominal Distance Between Bolt Holes Along Width | 21.250 INCHES ALL ENDS IN |
| Nominal Outside Diameter | 23.500 INCHES ALL ENDS IN |
| Bolt Hole Quantity | 16 ALL ENDS |
| Face to Face Distance | 30.000 INCHES IN |
| Material | COPPER ALLOY BODY |
| Nominal Thickness | 1.437 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 |
|---|---|
| 21-4 PRIMARY | Hunt Valve Company, Inc. (USA) |
| Reference | Meaning |
|---|---|
| D92270 | 5/9 Secondary reference Liberty Equipment & Supply |
| 21-4 | 3/9 Design control — primary reference Pima Valve, Llc |
| D92270 | 5/9 Secondary reference Short Thomas a Co |
NSN 4820-01-473-4222 is a Valve,check, manufactured by Hunt Valve Company, Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-473-4222 has 1 manufacturer part number on file: 21-4 (Hunt Valve Company, Inc.).
1 possible match (shared part number, not a government interchangeability claim): 5330-01-479-5843. Verify interchangeability with system specifications before substitution.
Key specifications for 21-4: Flow Control Device: DISK; Flange Shape: ROUND WITH HOLES ALL ENDS; Flange Face Design: PLAIN ALL ENDS; Bolt Circle Nominal Diameter: 1.125 INCHES ALL ENDS IN. 15 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.