The Valve,butterfly, cataloged under National Stock Number 4820-01-377-7388, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Esi Acquisition Corp Dba Esi Acquisition Corp. Government technical data includes 4 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-377-7388 |
| Primary Part Number | 81438-1 |
| Item Name | Valve,butterfly |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Esi Acquisition Corp Dba Esi Acquisition Corp |
| Status | ACTIVE |
| Operating Pressure | 380.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Nominal Thread Size | 6.000 INCHES ALL ENDS IN |
| Material | STEEL COMP 347 BODY |
| Material | STEEL COMP 347 FLOW CONTROL DEVICE |
| 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 |
|---|---|
| 81438-1 PRIMARY | Esi Acquisition Corp Dba Esi Acquisition Corp (USA) |
| 81438-1 PRIMARY | Eaton Aerospace Llc Dba Sterer Engineering Div Valve & Actuator (USA) |
| Reference | Meaning |
|---|---|
| 81438-1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-377-7388 is a Valve,butterfly, manufactured by Esi Acquisition Corp Dba Esi Acquisition Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-377-7388 has 2 manufacturer part numbers on file: 81438-1 (Esi Acquisition Corp Dba Esi Acquisition Corp), 81438-1 (Eaton Aerospace Llc Dba Sterer Engineering Div Valve & Actuator).
1 possible match (shared part number, not a government interchangeability claim): 3040-01-414-8259. Verify interchangeability with system specifications before substitution.
Key specifications for 81438-1: Operating Pressure: 380.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS; Nominal Thread Size: 6.000 INCHES ALL ENDS IN; Material: STEEL COMP 347 BODY; Material: STEEL COMP 347 FLOW CONTROL DEVICE. 4 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.