The Valve,check, cataloged under National Stock Number 4820-01-615-8284, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is The Boeing Company Div Services. Government technical data includes 6 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-615-8284 |
| Primary Part Number | HS4550-12 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | The Boeing Company Div Services |
| Status | ACTIVE |
| Connection Type | THREADED INTERNAL PIPE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Maximum Operating Temp | 275.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Media for Which Designed | OIL, LUBRICATING, DIESTER BASE SINGLE RESPONSE |
| Material | ALUMINUM ALLOY BODY |
| 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 |
|---|---|
| HS4550-12 PRIMARY | The Boeing Company Div Services (USA) |
| Reference | Meaning |
|---|---|
| 2S7228 | 5/2 Secondary reference U.S. Government activity |
| HS4550-12 | 3/9 Design control — primary reference The Boeing Company |
NSN 4820-01-615-8284 is a Valve,check, manufactured by The Boeing Company Div Services, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-615-8284 has 1 manufacturer part number on file: HS4550-12 (The Boeing Company Div Services).
Key specifications for HS4550-12: Connection Type: THREADED INTERNAL PIPE ALL ENDS; Style Designator: STRAIGHT THRU; Maximum Operating Temp: 275.0 FAHRENHEIT SINGLE RESPONSE DEGF; Media for Which Designed: OIL, LUBRICATING, DIESTER BASE SINGLE RESPONSE. 6 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.