The Valve,check, cataloged under National Stock Number 4820-01-078-5175, 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20 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-078-5175 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Surface Treatment Document and Classification | MIL-S-5002 MIL SPEC SINGLE TREATMENT RESPONSE |
| Connection Style | GASKET SEAL (BOSS) ALL ENDS |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Connection Type | THREADED INTERNAL BOSS ALL ENDS |
| Style Designator | ANGLE |
| Material Document and Classification | MIL-S-7720 MIL SPEC SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | QQ-S-763,CLASS 440C,COND A FED SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Operating Pressure | 50.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 1.250 INCHES ALL ENDS IN |
| Maximum Operating Temp | 200.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | SPRING |
| Surface Treatment | PASSIVATE |
| Media for Which Designed | OIL, LUBRICATING, DIESTER BASE SINGLE RESPONSE |
| Thread Class | 3B ALL ENDS |
| Material | STEEL CORROSION RESISTING BODY |
| Material | STEEL COMP 440C FLOW CONTROL DEVICE |
| Thread Series Designator | UNF 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 |
|---|---|
| 2C9844 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-078-5175 is a Valve,check, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-078-5175: Flow Control Device: POPPET; Surface Treatment Document and Classification: MIL-S-5002 MIL SPEC SINGLE TREATMENT RESPONSE; Connection Style: GASKET SEAL (BOSS) ALL ENDS; Mounting Position: HORIZONTAL OR VERTICAL. 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.