The Bellows,metallic,packless Valve, cataloged under National Stock Number 4820-01-448-8579, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Metrex Valve Corp. Dba Metrex Valve Corp. Government technical data includes 2 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-448-8579 |
| Primary Part Number | 50M-51-1M |
| Item Name | Bellows,metallic,packless Valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Metrex Valve Corp. Dba Metrex Valve Corp |
| Status | ACTIVE |
| General Characteristics Item Description | COMPONENT OF VALVE,REGULATING FLUID PRESSURE,NSN 4820-01-440-5062 |
| Material | NICKEL ALLOY |
| 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 |
|---|---|
| 50M-51-1M PRIMARY | Metrex Valve Corp. Dba Metrex Valve Corp (USA) |
| Reference | Meaning |
|---|---|
| MDFPM-3120C-3W ITEM 7 | 5/9 Secondary reference Metrex Valve Corp. Dba Metrex Valve Corp |
| MDFPM-3120C-3W | D/9 Drawing number reference only Metrex Valve Corp. Dba Metrex Valve Corp |
NSN 4820-01-448-8579 is a Bellows,metallic,packless Valve, manufactured by Metrex Valve Corp. Dba Metrex Valve Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-448-8579 has 1 manufacturer part number on file: 50M-51-1M (Metrex Valve Corp. Dba Metrex Valve Corp).
Key specifications for 50M-51-1M: General Characteristics Item Description: COMPONENT OF VALVE,REGULATING FLUID PRESSURE,NSN 4820-01-440-5062; Special Features: MATL PER QQ-N-281;MEDIA REFRIGERANT; End Item Identification: SEAWOLF CLASS SSN; Material: NICKEL ALLOY. 2 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.