The Valve,check, cataloged under National Stock Number 4820-01-223-3635, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Progress Rail Locomotive Inc. Dba Progress Rail Switching Services Llc. Government technical data includes 4 specifications, cited from the U.S. Government catalog. The record lists 4 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-223-3635 |
| Primary Part Number | 8366533 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Progress Rail Locomotive Inc. Dba Progress Rail Switching Services Llc |
| Status | ACTIVE |
| Mounting Position | VERTICAL |
| Style Designator | STRAIGHT THRU |
| Media for Which Designed | OIL, LUBRICATING, DIESTER BASE SINGLE RESPONSE |
| 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 |
|---|---|
| 8366533 PRIMARY | Progress Rail Locomotive Inc. Dba Progress Rail Switching Services Llc (USA) |
| 8366533 | Jmc Products, Inc. (USA) |
| 8366533 | Valley Power Systems Inc (USA) |
| 8366533 | Engine Systems, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 8366533 | 5/9 Secondary reference General Motors Corp Electro-Motive Div |
NSN 4820-01-223-3635 is a Valve,check, manufactured by Progress Rail Locomotive Inc. Dba Progress Rail Switching Services Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-223-3635 has 4 manufacturer part numbers on file: 8366533 (Progress Rail Locomotive Inc. Dba Progress Rail Switching Services Llc), 8366533 (Jmc Products, Inc.), 8366533 (Valley Power Systems Inc), 8366533 (Engine Systems, Inc.).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-610-6293. Verify interchangeability with system specifications before substitution.
Key specifications for 8366533: Mounting Position: VERTICAL; Style Designator: STRAIGHT THRU; Special Features: SOAK BACK PIPING; Media for Which Designed: OIL, LUBRICATING, DIESTER BASE SINGLE RESPONSE. 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.
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.