The Valve,check, cataloged under National Stock Number 4820-00-678-6754, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 20 specifications, cited from the U.S. Government catalog. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-678-6754 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Connection Style | PLAIN, OPTIONAL END (PIPE) ALL ENDS |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Connection Type | THREADED INTERNAL PIPE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Material Document and Classification | FED STD 66,AISI 416/SAE 51416 FED STD 1ST MATERIAL RESPONSE AND MIL-R-8791 MIL SPEC 2ND MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Material Document and Classification | FED STD 66,AISI 416/SAE 51416 FED STD SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | FED STD 66,AISI 416/SAE 51416 FED STD SINGLE MATERIAL RESPONSE SEAT |
| Operating Pressure | 10000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 0.250 INCHES ALL ENDS IN |
| Maximum Operating Temp | 500.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | SPRING |
| Surface Treatment | PASSIVATE |
| Media for Which Designed | WATER-OIL-GAS SINGLE RESPONSE |
| Material | STEEL COMP 416 BODY |
| Material | STEEL COMP 416 SEAT |
| Material | STEEL COMP 416 AND PLASTIC POLYTETRAFLUOROETHYLENE FLOW CONTROL DEVICE |
| Thread Series Designator | NPT ALL ENDS |
| 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 |
| Reference | Meaning |
|---|---|
| AP28118 | 5/9 Secondary reference Davey Compressor Co Div of Keco Industries Inc |
| 2320R2PP | 3/2 Design control — primary reference U.S. Government activity |
| 67A274C264 | C/1 Advisory reference — outside the item-of-supply concept Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier |
| 6184-55 | 5/2 Secondary reference U.S. Government activity |
| AP28118 | 5/9 Secondary reference Drs Environmental Systems Inc |
| AP28118 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 2015191 | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
| 6184-55 | 5/9 Secondary reference Air Dry Co of America, Llc |
NSN 4820-00-678-6754 is a Valve,check, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-678-6754: Flow Control Device: POPPET; Connection Style: PLAIN, OPTIONAL END (PIPE) ALL ENDS; Mounting Position: HORIZONTAL OR VERTICAL; Connection Type: THREADED INTERNAL PIPE ALL ENDS. 20 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.