The Valve,safety Relief, cataloged under National Stock Number 4820-01-323-8109, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Parts Center. Government technical data includes 11 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-323-8109 |
| Primary Part Number | 5231-B/350 PSI |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Parts Center |
| Status | ACTIVE |
| Flow Control Device | STEM |
| Connection Style | FLARED (TUBE) ALL ENDS |
| Seat Nominal Radius | 0.625 INCHES IN |
| Connection Type | THREADED CARTRIDGE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Operating Pressure | 450.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 0.500 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 |
|---|---|
| 5231-B/350 PSI | Parts Center (GBR) |
| 5231-B/350 PSI | Henry Technologies Limited (GBR) |
| Reference | Meaning |
|---|---|
| 5231-B | 5/1 Secondary reference Henry Technologies Limited |
| 5231-B 350PSI | 3/9 Design control — primary reference Henry Technologies, Inc. |
| 5231-B | 5/1 Secondary reference Parts Center |
NSN 4820-01-323-8109 is a Valve,safety Relief, manufactured by Parts Center, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-323-8109 has 2 manufacturer part numbers on file: 5231-B/350 PSI (Parts Center), 5231-B/350 PSI (Henry Technologies Limited).
Key specifications for 5231-B/350 PSI: Flow Control Device: STEM; Connection Style: FLARED (TUBE) ALL ENDS; Seat Nominal Radius: 0.625 INCHES IN; Connection Type: THREADED CARTRIDGE ALL ENDS. 11 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.