The Valve,pressure Equalizing,gaseou, cataloged under National Stock Number 4820-01-431-7399, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Control Devices, Incorporated. Government technical data includes 18 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-431-7399 |
| Primary Part Number | LGM20AM-F |
| Item Name | Valve,pressure Equalizing,gaseou |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Control Devices, Incorporated |
| Status | ACTIVE |
| Flow Control Device | DISK, CIRCULAR |
| First End Thread Series Designator | NPT |
| First End Thread Direction | RIGHT-HAND |
| Second End Relationship with First End | IDENTICAL |
| Third End Relationship with Preceding Ends | NOT IDENTICAL WITH FIRST OR SECOND END |
| First End Style Designator | PLAIN |
| Third End Nominal Pipe Size Accommodated | 0.375 INCHES IN |
| End Connection Quantity | 3 |
| Third End Thread Direction | RIGHT-HAND |
| Third End Thread Series Designator | NPT |
| First End Connection Type | THREADED INTERNAL PIPE |
| Third End Connection Type | THREADED INTERNAL PIPE |
| First End Nominal Pipe Size Accommodated | 0.500 INCHES IN |
| Material | COPPER ALLOY BODY |
| Media for Which Designed | AIR |
| Third End Style Designator | PLAIN |
| First End Nominal Thread Size | 0.500 INCHES IN |
| Third End Nominal Thread Size | 0.375 INCHES IN |
| 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 |
|---|---|
| LGM20AM-F PRIMARY | Control Devices, Incorporated (USA) |
| Reference | Meaning |
|---|---|
| LGM-20F | 5/9 Secondary reference Control Devices, Incorporated |
NSN 4820-01-431-7399 is a Valve,pressure Equalizing,gaseou, manufactured by Control Devices, Incorporated, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-431-7399 has 1 manufacturer part number on file: LGM20AM-F (Control Devices, Incorporated).
Key specifications for LGM20AM-F: Flow Control Device: DISK, CIRCULAR; First End Thread Series Designator: NPT; First End Thread Direction: RIGHT-HAND; Second End Relationship with First End: IDENTICAL. 18 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.