The Valve,check, cataloged under National Stock Number 4820-01-425-6594, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Parker-Hannifin Corporation Dba Pneutronics Div Tube Fittings Division. Government technical data includes 14 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-425-6594 |
| Primary Part Number | 1IN CK-3 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Parker-Hannifin Corporation Dba Pneutronics Div Tube Fittings Division |
| Status | ACTIVE |
| Minimum Operating Temp | -25.0 FAHRENHEIT DEGF |
| Connection Type | THREADED INTERNAL PIPE FIRST END |
| Operating Pressure | 300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Nominal Thread Size | 1.000 INCHES FIRST END IN |
| Maximum Operating Temp | 220.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | SPRING |
| Media for Which Designed | REFRIGERANT 22 SECOND RESPONSE |
| Media for Which Designed | REFRIGERANT 12 FIRST RESPONSE |
| Media for Which Designed | REFRIGERANT 114 THIRD RESPONSE |
| Media for Which Designed | REFRIGERANT R-500 FOURTH RESPONSE |
| Material | STEEL BODY |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE SEAT |
| Thread Series Designator | NPTF FIRST END |
| 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 |
NSN 4820-01-425-6594 is a Valve,check, manufactured by Parker-Hannifin Corporation Dba Pneutronics Div Tube Fittings Division, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-425-6594 has 2 manufacturer part numbers on file: 1IN CK-3 (Parker-Hannifin Corporation Dba Pneutronics Div Tube Fittings Division), 1009632 (Tld Ace Corp Div Tld Ace).
Key specifications for 1IN CK-3: Minimum Operating Temp: -25.0 FAHRENHEIT DEGF; Connection Type: THREADED INTERNAL PIPE FIRST END; Operating Pressure: 300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS; Nominal Thread Size: 1.000 INCHES FIRST END IN. 14 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.