The Exhaust and Relief Valve, cataloged under National Stock Number 4820-01-182-4510, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Derbyshire Machine & Tool Co. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 5 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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.
| Parameter | Value |
|---|---|
| NSN | 4820-01-182-4510 |
| Primary Part Number | 253342 ASSY 99 |
| Item Name | Exhaust and Relief Valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Derbyshire Machine & Tool Co |
| Status | ACTIVE |
| General Characteristics Item Description | CAST STEEL,STRAIGHT THRU FLANGED ENDS,5.000,150 LBS LBS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | N |
| Part Number | Manufacturer |
|---|---|
| 253342 ASSY 99 PRIMARY | Derbyshire Machine & Tool Co (USA) |
| 253342 ASSY 99 | Hunt Valve Company, Inc. (USA) |
| 94-D-279 PRIMARY | Derbyshire Machine & Tool Co (USA) |
| 253342 ASSY 99 PRIMARY | Draftco Incorporated Dba Draftco Inc Div Draftco Inc (USA) |
| 253342ASSY99 | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
| Reference | Meaning |
|---|---|
| 2652051 | 5/1 Secondary reference Draftco Incorporated Dba Draftco Inc Div Draftco Inc |
| D253342ASSY99 | 5/1 Secondary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
NSN 4820-01-182-4510 is a Exhaust and Relief Valve, manufactured by Derbyshire Machine & Tool Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-182-4510 has 5 manufacturer part numbers on file: 253342 ASSY 99 (Derbyshire Machine & Tool Co), 253342 ASSY 99 (Hunt Valve Company, Inc.), 94-D-279 (Derbyshire Machine & Tool Co), 253342 ASSY 99 (Draftco Incorporated Dba Draftco Inc Div Draftco Inc), 253342ASSY99 (Huntington Ingalls Inc Div Newport News Shipbuilding).
Key specifications for 253342 ASSY 99: General Characteristics Item Description: CAST STEEL,STRAIGHT THRU FLANGED ENDS,5.000,150 LBS LBS. 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.