The Valve,check, cataloged under National Stock Number 4820-00-353-7642, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 29 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-00-353-7642 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | DISKDISK |
| Flange Shape | RECTANGULAR WITH HOLES FIRST ENDRECTANGULAR WITH HOLES FIRST END |
| Flange Face Design | PLAIN SECOND END |
| Flange Face Design | PLAIN SECOND ENDPLAIN FIRST END |
| Surface Treatment Document and Classification | MIL-A-8625,TYPE 2 MIL SPEC SINGLE TREATMENT RESPONSE |
| Nominal Length | 4.010 INCHES FIRST END4.010 INCHES FIRST END IN |
| Nominal Length | 4.010 INCHES SECOND END4.010 INCHES SECOND END IN |
| Mounting Position | HORIZONTAL OR HORIZONTAL OR VERTICALVERTICAL |
| Connection Type | FLANGE SECOND ENDFLANGE SECOND END |
| Connection Type | FLANGE FIRST ENDFLANGE FIRST END |
| Style Designator | STRAIGHT THRU |
| Bolt Hole Nominal Diameter | 0.265 INCHES SECOND END IN |
| Bolt Hole Nominal Diameter | 0.265 INCHES SECOND END0.265 INCHES FIRST END IN |
| Operating Pressure | 120.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Center to Center Nominal Distance Between Bolt Holes Along Width | 3.250 INCHES FIRST END IN |
| Disk Loading Method | SPRINGSPRING |
| Bolt Hole Quantity | 4 FIRST END4 FIRST END |
| Bolt Hole Quantity | 4 SECOND END4 SECOND END |
| Surface Treatment | ANODIZE |
| Nominal Width | 3.885 INCHES SECOND END3.885 INCHES SECOND END IN |
| Nominal Width | 4.010 INCHES FIRST END4.010 INCHES FIRST END IN |
| Face to Face Distance | 3.865 INCHES IN |
| Center to Center Nominal Distance Between Bolt Holes Along Length | 3.250 INCHES SECOND END IN |
| Center to Center Nominal Distance Between Bolt Holes Along Length | 3.250 INCHES SECOND END3.250 INCHES FIRST END IN |
| Media for Which Designed | FUEL/OIL, HYDROCARBON SINGLE RESPONSE |
| Material | ALUMINUM ALLOY 384.0 OVERALL |
| Valve Operation Method | AUTOMATICAUTOMATIC |
| Nominal Thickness | 0.185 INCHES SECOND END IN |
| Nominal Thickness | 0.185 INCHES SECOND END0.185 INCHES FIRST END IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 225128-1 | 3/2 Design control — primary reference U.S. Government activity |
| 749939-103 | 3/2 Design control — primary reference U.S. Government activity |
| 749939 | 1/2 Source control — Government-approved source U.S. Government activity |
NSN 4820-00-353-7642 is a Valve,check, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5330-00-559-6123. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-00-353-7642: Flow Control Device: DISKDISK; Flange Shape: RECTANGULAR WITH HOLES FIRST ENDRECTANGULAR WITH HOLES FIRST END; Flange Face Design: PLAIN SECOND END; Flange Face Design: PLAIN SECOND ENDPLAIN FIRST END. 29 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.
NSN 4820-00-353-7642 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.