The Valve,check, cataloged under National Stock Number 4820-01-066-4067, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division. Government technical data includes 14 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-066-4067 |
| Primary Part Number | LT50 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Connection Style | PLAIN, OPTIONAL END (PIPE) SECOND END |
| Connection Style | PLAIN (PIPE) FIRST END |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Connection Type | THREADED INTERNAL PIPE SECOND END |
| Connection Type | THREADED EXTERNAL PIPE FIRST END |
| Style Designator | STRAIGHT THRU |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 0.500 INCHES ALL ENDS IN |
| Surface Treatment | PASSIVATE |
| Material | STEEL BODY |
| Material | PLASTIC FLOW CONTROL DEVICE |
| 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 |
|---|---|
| LT50 PRIMARY | Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division (USA) |
| LT50 | Amfs American Fleet Services (USA) |
| Reference | Meaning |
|---|---|
| LT50 | 3/9 Design control — primary reference Parker Hannifin Corporation Dba Gresen Hydraulics Div Hydraulic Valve Division |
NSN 4820-01-066-4067 is a Valve,check, manufactured by Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-066-4067 has 2 manufacturer part numbers on file: LT50 (Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division), LT50 (Amfs American Fleet Services).
4 possible matches (shared part number, not a government interchangeability claim): 6515-01-221-2113, 5975-01-628-1756, 2990-01-631-7978. Verify interchangeability with system specifications before substitution.
Key specifications for LT50: Flow Control Device: POPPET; Connection Style: PLAIN, OPTIONAL END (PIPE) SECOND END; Connection Style: PLAIN (PIPE) FIRST END; Mounting Position: HORIZONTAL OR VERTICAL. 14 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.