The Valve,check, cataloged under National Stock Number 4820-01-478-5478, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Velan Valve Corp.. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4820-01-478-5478 |
| Primary Part Number | 7683-500-037 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Velan Valve Corp. |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Furnished Items and Quantity | 1 COVER AND 1 GASKET AND 5 WASHER |
| Mounting Position | HORIZONTAL |
| Style Designator | STRAIGHT THRU FLANGED ENDS |
| Material Document and Classification | ASTM A182, TYPE F347 ASSN STD SINGLE MATERIAL RESPONSE SEAT |
| Material Document and Classification | ASTMA35/CF8C ASSN STD 1ST MATERIAL RESPONSE BODY |
| Valve Size | 4.000 INCHES IN |
| Material | STEEL COMP 347 SEAT |
| Material | STEEL UNS J92710 BODY |
| Valve Operation Method | AUTOMATIC |
| 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 |
|---|---|
| 7683-500-037 PRIMARY | Velan Valve Corp. (USA) |
| Reference | Meaning |
|---|---|
| 7490-725 | D/9 Drawing number reference only Velan Valve Corp. |
NSN 4820-01-478-5478 is a Valve,check, manufactured by Velan Valve Corp., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-478-5478 has 1 manufacturer part number on file: 7683-500-037 (Velan Valve Corp.).
Key specifications for 7683-500-037: Flow Control Device: DISK; Furnished Items and Quantity: 1 COVER AND 1 GASKET AND 5 WASHER; Mounting Position: HORIZONTAL; Style Designator: STRAIGHT THRU FLANGED ENDS. 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.