The Valve,check, cataloged under National Stock Number 4820-00-482-7975, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier. Government technical data includes 25 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-482-7975 |
| Primary Part Number | 2497171 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
| Status | ACTIVE |
| Flow Control Device | POPPETPOPPET |
| Connection Style | FLARED (TUBE) FIRST ENDFLARED (TUBE) FIRST END |
| Mounting Position | HORIZONTAL OR HORIZONTAL OR VERTICALVERTICAL |
| Connection Type | THREADED EXTERNAL TUBE FIRST ENDTHREADED EXTERNAL TUBE FIRST END |
| Style Designator | STRAIGHT THRU |
| Nominal Outside Diameter Tube Accommodated | 0.250 INCHES FIRST END IN |
| Operating Pressure | 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Thread Direction | RIGHT-HAND FIRST ENDRIGHT-HAND FIRST END |
| Nominal Thread Size | 0.438 INCHES FIRST END0.438 INCHES FIRST END IN |
| Seat Angle | 37.0 DEGREES FIRST END |
| Maximum Operating Temp | -40.0 FAHRENHEIT FIRST RESPONSE-40.0 FAHRENHEIT FIRST RESPONSE DEGF |
| Maximum Operating Temp | 250.0 FAHRENHEIT SECOND RESPONSE250.0 FAHRENHEIT SECOND RESPONSE DEGF |
| Disk Loading Method | SPRINGSPRING |
| Media for Which Designed | CARBON DIOXIDE FIFTH RESPONSE |
| Media for Which Designed | ACETYLENE SECOND RESPONSEAIR FIRST RESPONSE |
| Media for Which Designed | ALCOHOL, ETHYL THIRD RESPONSEACETYLENE SECOND RESPONSE |
| Media for Which Designed | AMMONIA, GASEOUS FOURTH RESPONSEALCOHOL, ETHYL THIRD RESPONSE |
| Media for Which Designed | CARBON DIOXIDE FIFTH RESPONSEAMMONIA, GASEOUS FOURTH RESPONSE |
| Thread Class | 3A FIRST END3A FIRST END A |
| Thread Quantity Per Inch | 20 FIRST END20 FIRST END |
| Material | STEEL COMP 316 FLOW CONTROL DEVICE |
| Material | STEEL COMP 316 FLOW CONTROL DEVICESTEEL COMP 316 SEAT |
| Material | STEEL COMP 316 SEATSTEEL COMP 316 BODY |
| Thread Series Designator | UNF FIRST END |
| Valve Operation Method | AUTOMATICAUTOMATIC |
| 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 |
|---|---|
| 2497171 | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA) |
| Reference | Meaning |
|---|---|
| 249T1-4UT | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-00-482-7975 is a Valve,check, manufactured by Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-482-7975 has 1 manufacturer part number on file: 2497171 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier).
Key specifications for 2497171: Flow Control Device: POPPETPOPPET; Connection Style: FLARED (TUBE) FIRST ENDFLARED (TUBE) FIRST END; Mounting Position: HORIZONTAL OR HORIZONTAL OR VERTICALVERTICAL; Connection Type: THREADED EXTERNAL TUBE FIRST ENDTHREADED EXTERNAL TUBE FIRST END. 25 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.