The Valve,safety Relief, cataloged under National Stock Number 4820-01-381-3760, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Sun Hydraulics Corporation. Government technical data includes 3 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-381-3760 |
| Primary Part Number | RPEC LBN FBY |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Sun Hydraulics Corporation |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Style Designator | STRAIGHT THRU NOTE: TO BE USED FOR VALVE BODIES OF ONE SECTION ONLY. |
| 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 |
| Part Number | Manufacturer |
|---|---|
| RPEC LBN FBY PRIMARY | Sun Hydraulics Corporation (USA) |
| Reference | Meaning |
|---|---|
| 25840-1 | 5/9 Secondary reference U.S. Government activity |
| 25840 | 5/9 Secondary reference U.S. Government activity |
| 25840-1 | 5/2 Secondary reference U.S. Government activity |
| 25840-1 | 5/9 Secondary reference Drs Environmental Systems Inc |
NSN 4820-01-381-3760 is a Valve,safety Relief, manufactured by Sun Hydraulics Corporation, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-381-3760 has 1 manufacturer part number on file: RPEC LBN FBY (Sun Hydraulics Corporation).
2 possible matches (shared part number, not a government interchangeability claim): 6515-01-381-8348, 1680-01-596-1945. Verify interchangeability with system specifications before substitution.
Key specifications for RPEC LBN FBY: Flow Control Device: POPPET; Style Designator: STRAIGHT THRU NOTE: TO BE USED FOR VALVE BODIES OF ONE SECTION ONLY.; End Item Identification: 3835-01-324-6354; Valve Operation Method: AUTOMATIC. 3 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.