The Valve,safety Relief, cataloged under National Stock Number 4820-01-495-7097, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Ministry of Defence, Es (sea)/warship Support Agency, Ssipt, Stratsys Log1a2. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | Ministry of Defence, Es (sea)/warship Support Agency, Ssipt, Stratsys Log1a2 (CAGE KD264); Naval Undersea Warfare Ctr (CAGE 50225) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-495-7097 |
| Primary Part Number | HP559B-2M-150 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Ministry of Defence, Es (sea)/warship Support Agency, Ssipt, Stratsys Log1a2 |
| 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 |
|---|---|
| HP559B-2M-150 | Ministry of Defence, Es (sea)/warship Support Agency, Ssipt, Stratsys Log1a2 (GBR) |
| 7339177 | Naval Undersea Warfare Ctr (USA) |
| Reference | Meaning |
|---|---|
| 7339177 | D/9 Drawing number reference only Naval Sea Systems Command |
| 559B-2M-150 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-495-7097 is a Valve,safety Relief, manufactured by Ministry of Defence, Es (sea)/warship Support Agency, Ssipt, Stratsys Log1a2, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-495-7097 has 2 manufacturer part numbers on file: HP559B-2M-150 (Ministry of Defence, Es (sea)/warship Support Agency, Ssipt, Stratsys Log1a2), 7339177 (Naval Undersea Warfare Ctr).
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.