The Valve,check, cataloged under National Stock Number 4820-01-517-2823, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is International Valve Corp Dba Check-All Valve Mfg. Co.. Government technical data includes 21 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-517-2823 |
| Primary Part Number | UN-3-075-22-5-1/2 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | International Valve Corp Dba Check-All Valve Mfg. Co. |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Renewable Seat Ring Type | PRESSED-IN |
| Connection Style | PLAIN, OPTIONAL END (PIPE) ALL ENDS |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Connection Type | THREADED INTERNAL TUBE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Material Document and Classification | ASTM 1479 GR 316 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Material Document and Classification | PCAF00 NATIONAL SPEC SINGLE MATERIAL RESPONSE SEAT |
| Nominal Outside Diameter Tube Accommodated | 0.750 INCHES ALL ENDS IN |
| Operating Pressure | 15.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 0.750 INCHES ALL ENDS IN |
| Maximum Operating Temp | 100.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | SPRING |
| Thread Class | 2B ALL ENDS |
| Thread Quantity Per Inch | 18 ALL ENDS |
| Material | STEEL CORROSION RESISTING OVERALL |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE SEAT |
| Thread Series Designator | NPT ALL ENDS |
| Opening Pressure Setting | 0.5 POUNDS PER SQUARE INCH LBS |
| 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 |
|---|---|
| UN-3-075-22-5-1/2 PRIMARY | International Valve Corp Dba Check-All Valve Mfg. Co. (USA) |
| Reference | Meaning |
|---|---|
| 55839 ITEM 7 | 5/2 Secondary reference U.S. Government activity |
| 55836 ITEM 14 | 5/2 Secondary reference U.S. Government activity |
NSN 4820-01-517-2823 is a Valve,check, manufactured by International Valve Corp Dba Check-All Valve Mfg. Co., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-517-2823 has 1 manufacturer part number on file: UN-3-075-22-5-1/2 (International Valve Corp Dba Check-All Valve Mfg. Co.).
Key specifications for UN-3-075-22-5-1/2: Flow Control Device: DISK; Renewable Seat Ring Type: PRESSED-IN; Connection Style: PLAIN, OPTIONAL END (PIPE) ALL ENDS; Mounting Position: HORIZONTAL OR VERTICAL. 21 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.