The Valve,pressure Equalizing,gaseou, cataloged under National Stock Number 4820-01-230-6578, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 17 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-230-6578 |
| Item Name | Valve,pressure Equalizing,gaseou |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | DISK, CIRCULAR |
| First End Thread Direction | RIGHT-HAND |
| Temp Rating | 160.0 FAHRENHEIT DEGF |
| Body Style | SINGLE CONNECTION, STRAIGHT FLOW |
| First End Thread Class | 2A A |
| First End Style Designator | PLAIN |
| End Connection Quantity | 1 |
| Operating Pressure | 15.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS |
| Specification/standard Data | 81349-MIL-V-27166 GOVERNMENT SPECIFICATION |
| Nondefinitive Spec/std Data | 3 TYPE AND 1 CLASS |
| Valve Venting Design Type | ATMOSPHERIC |
| First End Connection Type | THREADED EXTERNAL TUBE |
| First End Outside Diameter Tube Accommodated | 0.625 INCHES NOMINAL IN |
| Material | STEEL CORROSION RESISTING BODY |
| Media for Which Designed | HYDROCARBON FUELS AND OILS |
| Absolute Pressure Setting | 2.0 |
| Valve Relief Design Type | PRESSURE AND VACUUM |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| MIL-V-27166 | 4/1 Identification reference U.S. Government activity |
| MIL-V-27166C | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 675035 | 5/2 Secondary reference U.S. Government activity |
| 675035P1 | 5/2 Secondary reference U.S. Government activity |
| CV39-8 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-230-6578 is a Valve,pressure Equalizing,gaseou, classified under FSC 4820, Valves, Nonpowered. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 4820-01-240-2724, 4820-01-445-1127, 4820-01-491-0556. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-230-6578: Flow Control Device: DISK, CIRCULAR; First End Thread Direction: RIGHT-HAND; Temp Rating: 160.0 FAHRENHEIT DEGF; Body Style: SINGLE CONNECTION, STRAIGHT FLOW. 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.
NSN 4820-01-230-6578 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.