The Valve,check, cataloged under National Stock Number 4820-00-528-2361, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 15 specifications, cited from the U.S. Government catalog. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 6 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-528-2361 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | CONE |
| Connection Style | FLARED (TUBE) FIRST END |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Connection Type | THREADED EXTERNAL TUBE FIRST END |
| Nominal Outside Diameter Tube Accommodated | 0.312 INCHES FIRST END IN |
| Operating Pressure | 450.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.500 INCHES FIRST END IN |
| Seat Angle | 37.0 DEGREES FIRST END |
| Nondefinitive Spec/std Data | H STYLE |
| Media for Which Designed | OXYGEN, GASEOUS SINGLE RESPONSE |
| Thread Class | 3A FIRST END A |
| Test Data Document | 81349-MIL-V-7908 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.). |
| Thread Quantity Per Inch | 20 FIRST END |
| Thread Series Designator | UNF FIRST END |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 9900A | 5/1 Secondary reference Ingersoll-Rand Company Dba Ingersoll-Rand |
| 8148650 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| AN6037-1 | 2/2 Government specification standardization U.S. Government activity |
| MS21211-8 | 5/1 Secondary reference U.S. Government activity |
| 2680M | 5/9 Secondary reference Scovill Inc Schrader Bellows Div |
| 4395 | 5/1 Secondary reference U.S. Government activity |
NSN 4820-00-528-2361 is a Valve,check, classified under FSC 4820, Valves, Nonpowered. Status: active.
6 possible matches (shared part number, not a government interchangeability claim): 3830-00-562-0773, 6625-00-783-5013, 5330-00-862-9772. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-00-528-2361: Flow Control Device: CONE; Connection Style: FLARED (TUBE) FIRST END; Mounting Position: HORIZONTAL OR VERTICAL; Connection Type: THREADED EXTERNAL TUBE FIRST END. 15 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.