The Valve,safety Relief, cataloged under National Stock Number 4820-00-034-1577, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Hydraulics International, Inc. Dba Hydraulics International Inc. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Manufacturers | Hydraulics International, Inc. Dba Hydraulics International Inc (CAGE 56529) |
| Parameter | Value |
|---|---|
| NSN | 4820-00-034-1577 |
| Primary Part Number | 31511-100 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Hydraulics International, Inc. Dba Hydraulics International Inc |
| Status | ACTIVE |
| 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 |
|---|---|
| 31511-100 PRIMARY | Hydraulics International, Inc. Dba Hydraulics International Inc (USA) |
| Reference | Meaning |
|---|---|
| 000993-284-3 | 5/9 Secondary reference Hydraulics International, Inc. Dba Hydraulics International Inc |
| 1LL22F6T15S | 5/9 Secondary reference Danfoss Fluid Power Inc Easley Opn |
| 65C35628-5 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 000993-284-3 | 7/2 Vendor item drawing reference U.S. Government activity |
| 4820PL0654403 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| 65C35628-5 | 7/2 Vendor item drawing reference Air Armament Center/ En |
| 00993-284-3 | 5/9 Secondary reference Hydraulics International Inc |
| A-961405S | 5/9 Secondary reference Danfoss Fluid Power Inc Easley Opn |
| 65C35628-5 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-00-034-1577 is a Valve,safety Relief, manufactured by Hydraulics International, Inc. Dba Hydraulics International Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-034-1577 has 1 manufacturer part number on file: 31511-100 (Hydraulics International, Inc. Dba Hydraulics International Inc).
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.