The Valve,pressure Equalizing,gaseou, cataloged under National Stock Number 4820-01-577-2142, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Circle Valve Technologies Inc. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-577-2142 |
| Primary Part Number | 533B-2M-2.5 |
| Item Name | Valve,pressure Equalizing,gaseou |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Circle Valve Technologies Inc |
| Status | ACTIVE |
| Material | COPPER ALLOY BODY |
| 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 |
|---|---|
| 533B-2M-2.5 | Circle Valve Technologies Inc (USA) |
| Reference | Meaning |
|---|---|
| 533B-2M-2.5 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-577-2142 is a Valve,pressure Equalizing,gaseou, manufactured by Circle Valve Technologies Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-577-2142 has 1 manufacturer part number on file: 533B-2M-2.5 (Circle Valve Technologies Inc).
Key specifications for 533B-2M-2.5: Part Name Assigned by Controlling Agency: VALVE,RELIEF; End Item Identification: NEW CONSTRUCTION CVN77; Material: COPPER ALLOY BODY. 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.