The Valve,check, cataloged under National Stock Number 4820-01-305-9791, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Fluidyne Corporation Dba Fluidyne Corp. 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-305-9791 |
| Primary Part Number | 330576 ASSY K |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Fluidyne Corporation Dba Fluidyne Corp |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Nominal Pipe Size Accommodated | 0.250 INCHES ALL ENDS IN |
| Connection Style | SOCKET (PIPE) ALL ENDS |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Connection Type | UNTHREADED INTERNAL PIPE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Operating Pressure | 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Disk Loading Method | SPRING |
| Media for Which Designed | FUEL/OIL, HYDROCARBON SINGLE RESPONSE |
| Material | STEEL COMP 416 FLOW CONTROL DEVICE |
| Material | STEEL COMP 303 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 |
|---|---|
| 330576 ASSY K PRIMARY | Fluidyne Corporation Dba Fluidyne Corp (USA) |
| Reference | Meaning |
|---|---|
| 330576 ASSY K | 5/9 Secondary reference Eaton Corporation Dba Eaton Inoac Div Eaton |
| 330576 ASSY K | 5/9 Secondary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
| 330576 | D/9 Drawing number reference only Huntington Ingalls Inc Div Newport News Shipbuilding |
NSN 4820-01-305-9791 is a Valve,check, manufactured by Fluidyne Corporation Dba Fluidyne Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-305-9791 has 1 manufacturer part number on file: 330576 ASSY K (Fluidyne Corporation Dba Fluidyne Corp).
Key specifications for 330576 ASSY K: Flow Control Device: DISK; Nominal Pipe Size Accommodated: 0.250 INCHES ALL ENDS IN; Connection Style: SOCKET (PIPE) ALL ENDS; Mounting Position: HORIZONTAL OR VERTICAL. 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.