The Valve,safety Relief, cataloged under National Stock Number 4820-01-493-6399, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Johnson Controls Navy Systems, Llc. The record lists 3 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-493-6399 |
| Primary Part Number | 022-09221 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Johnson Controls Navy Systems, Llc |
| Status | ACTIVE |
| 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 |
|---|---|
| 022 09221 000 | Johnson Controls Ltd, York Navy Systems (GBR) |
| 022-09221 PRIMARY | Johnson Controls Navy Systems, Llc (USA) |
| 376-86605-0100 ITEM 24 | Johnson Controls Navy Systems, Llc (USA) |
| Reference | Meaning |
|---|---|
| 376-86605-000 | D/9 Drawing number reference only Johnson Controls Navy Systems, Llc |
| 022-09221-000 | C/1 Advisory reference — outside the item-of-supply concept Johnson Controls Navy Systems, Llc |
NSN 4820-01-493-6399 is a Valve,safety Relief, manufactured by Johnson Controls Navy Systems, Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-493-6399 has 3 manufacturer part numbers on file: 022 09221 000 (Johnson Controls Ltd, York Navy Systems), 022-09221 (Johnson Controls Navy Systems, Llc), 376-86605-0100 ITEM 24 (Johnson Controls Navy Systems, Llc).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-620-6122. Verify interchangeability with system specifications before substitution.
Key specifications for 022-09221: Special Features: NHA R-134C AIR CONDITIONING 800 TON WATER COOLING SYSTEM. 0 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.