The Valve,check, cataloged under National Stock Number 4820-00-147-8546, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 16 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-00-147-8546 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Renewable Seat Ring Type | RETAINING SCREW |
| Connection Style | DOUBLE THREADED SECTION BOSS FITTING GASKET WITH LOCKNUT SEALING, BOSS ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Material Document and Classification | QQ-B-637 FED SPEC SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Operating Pressure | 6000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 1.750 INCHES ALL ENDS IN |
| Disk Loading Method | SPRING |
| Thread Class | 2A ALL ENDS A |
| Thread Quantity Per Inch | 12 ALL ENDS |
| Material | COPPER ALLOY BODY |
| Material | NICKEL ALLOY SEAT |
| Thread Series Designator | UN 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 |
| Reference | Meaning |
|---|---|
| B4862 | 5/9 Secondary reference U.S. Government activity |
| 123-3 | 5/9 Secondary reference U.S. Government activity |
| 123A-3 PL4351 | 3/2 Design control — primary reference U.S. Government activity |
| 123A-3 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-00-147-8546 is a Valve,check, classified under FSC 4820, Valves, Nonpowered. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 6680-00-410-0576, 6740-00-675-9741. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-00-147-8546: Flow Control Device: DISK; Renewable Seat Ring Type: RETAINING SCREW; Connection Style: DOUBLE THREADED SECTION BOSS FITTING GASKET WITH LOCKNUT SEALING, BOSS ALL ENDS; Style Designator: STRAIGHT THRU. 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.