The Valve,check, cataloged under National Stock Number 4820-01-549-7128, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Airtech 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-549-7128 |
| Primary Part Number | 19-4-4-SPV-2IN |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Airtech Inc |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Material Document and Classification | ASTM A312 GR 316 WELDMENT ASSN STD SINGLE MATERIAL RESPONSE BODY |
| Operating Pressure | 150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Valve Size | 2.000 INCHES IN |
| Maximum Operating Temp | 70.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | SPRING |
| Media for Which Designed | ETHYLENE GLYCOL SINGLE RESPONSE |
| Material | STEEL CORROSION RESISTING 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 |
|---|---|
| 19-4-4-SPV-2IN PRIMARY | Airtech Inc (USA) |
| Reference | Meaning |
|---|---|
| PA20397/2110 REV 3 IT 23 | 5/9 Secondary reference Alstom Power Conversion Inc. |
NSN 4820-01-549-7128 is a Valve,check, manufactured by Airtech Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-549-7128 has 1 manufacturer part number on file: 19-4-4-SPV-2IN (Airtech Inc).
Key specifications for 19-4-4-SPV-2IN: Flow Control Device: DISK; Flange Shape: ROUND WITH HOLES ALL ENDS; Connection Type: FLANGE ALL ENDS; 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.