The Parts Kit,safety Relief Valve, cataloged under National Stock Number 4820-01-017-6565, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Dresser, Inc. Dba Dresser Roots Blowers & Compressors Div Dresser Roots. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-017-6565 |
| Primary Part Number | 821-164-021 |
| Item Name | Parts Kit,safety Relief Valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Dresser, Inc. Dba Dresser Roots Blowers & Compressors Div Dresser Roots |
| Status | ACTIVE |
| Component Quantity | 11 |
| Supply Items and Quantities | 0.250 IN. THK;6.000 IN. OD;1.875 IN ID WASHER SHAPE STEEL PLATES 9;0.250 IN. THK;4.375 IN. OD;1.875 IN. ID WASHER SHAP STEE PLATE 1;THD INTERNAL CAP NUT 1 IN |
| 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 |
|---|---|
| 821-164-021 PRIMARY | Dresser, Inc. Dba Dresser Roots Blowers & Compressors Div Dresser Roots (USA) |
| Reference | Meaning |
|---|---|
| D12527 | 5/9 Secondary reference Dresser, Inc. Dba Dresser Roots Blowers & Compressors Div Dresser Roots |
NSN 4820-01-017-6565 is a Parts Kit,safety Relief Valve, manufactured by Dresser, Inc. Dba Dresser Roots Blowers & Compressors Div Dresser Roots, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-017-6565 has 1 manufacturer part number on file: 821-164-021 (Dresser, Inc. Dba Dresser Roots Blowers & Compressors Div Dresser Roots).
Key specifications for 821-164-021: Component Quantity: 11; Supply Items and Quantities: 0.250 IN. THK;6.000 IN. OD;1.875 IN ID WASHER SHAPE STEEL PLATES 9;0.250 IN. THK;4.375 IN. OD;1.875 IN. ID WASHER SHAP STEE PLATE 1;THD INTERNAL CAP NUT 1 IN. 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.