The Valve,check,oxygen System, cataloged under National Stock Number 4820-01-522-4757, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 18 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4820-01-522-4757 |
| Item Name | Valve,check,oxygen System |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Connection Style | FLARED (TUBE) ALL ENDS |
| Minimum Operating Temp | -40.0 FAHRENHEIT DEGF |
| Connection Type | THREADED EXTERNAL TUBE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Operating Pressure | 100.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 0.312 INCHES ALL ENDS IN |
| Seat Angle | 37.0 DEGREES ALL ENDS |
| Maximum Operating Temp | 140.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Bonnet Attachment Method | THREADED |
| Media for Which Designed | OXYGEN, LIQUID SINGLE RESPONSE |
| Media for Which Designed | AIR SECOND RESPONSE |
| Thread Class | 3A ALL ENDS A |
| Thread Quantity Per Inch | 20 ALL ENDS |
| Material | RUBBER SILICONE CLASS Q FLOW CONTROL DEVICE |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS |
| Valve Operation Method | MANUAL |
| 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 |
|---|---|
| P21018 | 3/9 Design control — primary reference Pacific Precision Products Mfg. Dba Pacific Precision Products Div Zodiac Pacific Precision Products |
NSN 4820-01-522-4757 is a Valve,check,oxygen System, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-522-4757: Flow Control Device: POPPET; Connection Style: FLARED (TUBE) ALL ENDS; Minimum Operating Temp: -40.0 FAHRENHEIT DEGF; Connection Type: THREADED EXTERNAL TUBE ALL ENDS. 18 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.