The Valve,safety Relief, cataloged under National Stock Number 4820-01-140-3781, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Ausco Inc. Government technical data includes 4 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-140-3781 |
| Primary Part Number | H959 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Ausco Inc |
| Status | ACTIVE |
| Style Designator | DROP-IN CARTRIDGE |
| Media for Which Designed | OIL, LUBRICATING, DIESTER BASE SINGLE RESPONSE |
| Valve Discharge Flow Rate | 4.2 GALLONS PER MINUTE |
| Valve Operation Method | AUTOMATIC |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| H959 PRIMARY | Ausco Inc (USA) |
| Reference | Meaning |
|---|---|
| 10124630 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| D8062 | 5/9 Secondary reference Preece Inc Decca Valves Div |
| 42312-168 | 1/2 Source control — Government-approved source U.S. Government activity |
| H9569 | 5/9 Secondary reference Ausco Inc |
| 42312E168 | 5/2 Secondary reference U.S. Government activity |
NSN 4820-01-140-3781 is a Valve,safety Relief, manufactured by Ausco Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-140-3781 has 1 manufacturer part number on file: H959 (Ausco Inc).
Key specifications for H959: Style Designator: DROP-IN CARTRIDGE; Media for Which Designed: OIL, LUBRICATING, DIESTER BASE SINGLE RESPONSE; Valve Discharge Flow Rate: 4.2 GALLONS PER MINUTE; Valve Operation Method: AUTOMATIC. 4 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.
NSN 4820-01-140-3781 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.