The Valve,safety Relief, cataloged under National Stock Number 4820-01-532-0874, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Mission Systems Orchard Park Inc. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 3 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-532-0874 |
| Primary Part Number | B44111-1 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Mission Systems Orchard Park Inc |
| Status | ACTIVE |
| Criticality Code Justification | AGAV |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| D520T1-1M-130 | Scott Industrial Systems, Inc (USA) |
| B44111-1 PRIMARY | Mission Systems Orchard Park Inc (USA) |
| D520T1-1M-130 | Dela Technology Corporation Dba Dela Technology Corp (USA) |
| Reference | Meaning |
|---|---|
| D520T1-1M-130 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-532-0874 is a Valve,safety Relief, manufactured by Mission Systems Orchard Park Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-532-0874 has 3 manufacturer part numbers on file: D520T1-1M-130 (Scott Industrial Systems, Inc), B44111-1 (Mission Systems Orchard Park Inc), D520T1-1M-130 (Dela Technology Corporation Dba Dela Technology Corp).
Key specifications for B44111-1: Criticality Code Justification: AGAV; Part Name Assigned by Controlling Agency: INAVY-VALVE, RELIEF; End Item Identification: SPECIAL PROJECTS (GFE). 1 specification is 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.