The Valve,check, cataloged under National Stock Number 4820-00-021-2951, 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 16 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4820-00-021-2951 |
| Primary Part Number | 2594339PC1 |
| 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 | POPPET |
| Connection Style | PLAIN (TUBE) ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Material Document and Classification | MIL-P-5315 MIL SPEC SINGLE MATERIAL RESPONSE PACKING |
| Material Document and Classification | 66,AISI B1113,1213/SAE 1113 FED STD SINGLE MATERIAL RESPONSE BODY |
| Nominal Outside Diameter Tube Accommodated | 0.748 INCHES ALL ENDS IN |
| Operating Pressure | 5000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Maximum Operating Temp | 280.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Media for Which Designed | ETHYLENE GLYCOL FOURTH RESPONSE |
| Media for Which Designed | CARBON DIOXIDE THIRD RESPONSE |
| Media for Which Designed | WATER, FRESH FIFTH RESPONSE |
| Media for Which Designed | AIR FIRST RESPONSE |
| Media for Which Designed | AMMONIA, GASEOUS SECOND RESPONSE |
| Material | STEEL BODY |
| Material | RUBBER SYNTHETIC PACKING |
| 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 |
|---|---|
| 2594339PC1 | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA) |
| Reference | Meaning |
|---|---|
| 5831175 | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
| C249S-1Q-5 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-00-021-2951 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 4820-00-021-2951 has 1 manufacturer part number on file: 2594339PC1 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier).
Key specifications for 2594339PC1: Flow Control Device: POPPET; Connection Style: PLAIN (TUBE) ALL ENDS; Style Designator: STRAIGHT THRU; Material Document and Classification: MIL-P-5315 MIL SPEC SINGLE MATERIAL RESPONSE PACKING. 16 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.