The Valve,check, cataloged under National Stock Number 4820-01-375-0302, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-375-0302 |
| Primary Part Number | 5210310 PART 3 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Connection Style | PLAIN, OPTIONAL END (PIPE) ALL ENDS |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Connection Type | THREADED INTERNAL PIPE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Operating Pressure | 3000.0 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 | 212.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Media for Which Designed | CARBON DIOXIDE THIRD RESPONSE |
| Media for Which Designed | WATER, FRESH FIFTH RESPONSE |
| Media for Which Designed | AIR SECOND RESPONSE |
| Media for Which Designed | ACETYLENE FIRST RESPONSE |
| Media for Which Designed | HYDRAULIC FLUID, MINERAL BASE FOURTH RESPONSE |
| Material | STEEL COMP 316 BODY |
| Thread Series Designator | NPT ALL ENDS |
| 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 |
|---|---|
| 5210310 PART 3 | Naval Sea Systems Command (USA) |
| 5210466 | Naval Sea Systems Command (USA) |
| 5210466-2 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 249T1-6PP | 3/2 Design control — primary reference U.S. Government activity |
| 5210310 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 4820-01-375-0302 is a Valve,check, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-375-0302 has 3 manufacturer part numbers on file: 5210310 PART 3 (Naval Sea Systems Command), 5210466 (Naval Sea Systems Command), 5210466-2 (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 4730-01-407-3676. Verify interchangeability with system specifications before substitution.
Key specifications for 5210310 PART 3: Flow Control Device: POPPET; Connection Style: PLAIN, OPTIONAL END (PIPE) ALL ENDS; Mounting Position: HORIZONTAL OR VERTICAL; Connection Type: THREADED INTERNAL PIPE ALL ENDS. 17 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.