The Valve,safety Relief, cataloged under National Stock Number 4820-01-491-4833, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Johnson Controls Ltd, York Navy Systems. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4820-01-491-4833 |
| Primary Part Number | 426L64130-M00 ITEM 23 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Johnson Controls Ltd, York Navy Systems |
| Status | ACTIVE |
| Connection Style | FLARED (TUBE) ALL ENDS |
| Connection Type | THREADED CARTRIDGE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 0.375 INCHES ALL ENDS IN |
| Material | COPPER ALLOY BODY |
| Thread Series Designator | NPT ALL ENDS |
| Valve Operation Method | AUTOMATIC |
| 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 |
|---|---|
| 426L64130-M00 ITEM 23 | Johnson Controls Ltd, York Navy Systems (GBR) |
| 268L64399-M00 | Johnson Controls Ltd, York Navy Systems (GBR) |
| Reference | Meaning |
|---|---|
| 5231 250 PSI | 3/9 Design control — primary reference Henry Technologies, Inc. |
NSN 4820-01-491-4833 is a Valve,safety Relief, manufactured by Johnson Controls Ltd, York Navy Systems, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-491-4833 has 2 manufacturer part numbers on file: 426L64130-M00 ITEM 23 (Johnson Controls Ltd, York Navy Systems), 268L64399-M00 (Johnson Controls Ltd, York Navy Systems).
Key specifications for 426L64130-M00 ITEM 23: Connection Style: FLARED (TUBE) ALL ENDS; Connection Type: THREADED CARTRIDGE ALL ENDS; Style Designator: STRAIGHT THRU; Thread Direction: RIGHT-HAND ALL ENDS. 8 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.