The Valve,rotary,selector, cataloged under National Stock Number 4820-00-778-1578, 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 1 manufacturer part number 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4820-00-778-1578 |
| Primary Part Number | 8191E-4AS2 |
| Item Name | Valve,rotary,selector |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division |
| Status | ACTIVE |
| Flow Control Device | PORTED ROTOR |
| Maximum Operating Temp and Media for Which Designed | 160.0 FAHRENHEIT AIR DEGF |
| Operating Pressure and Type | 4000.0 POUNDS PER SQUARE INCH (PSI) AIR MAXIMUM REQUIRED LBS |
| Connection Type | THREADED INTERNAL BOSS |
| Valve Size | 0.250 INCHES IN |
| Flow Type | THREE-WAY |
| Nominal Thread Size | 0.438 INCHES IN |
| Body Material | STEEL CORROSION RESISTING |
| Mounting Facility | INLINE |
| Connection Location | SIDE |
| Thread Class | 3B |
| Connection Quantity | 3 |
| Thread Series Designator | UNF |
| Valve Operation Method | MANUAL |
| 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 |
|---|---|
| 8191E-4AS2 PRIMARY | Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division (USA) |
| Reference | Meaning |
|---|---|
| 8191-4A | 5/9 Secondary reference U.S. Government activity |
| 8191E-4AS2 | 5/9 Secondary reference U.S. Government activity |
| 8191B4AS2 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-00-778-1578 is a Valve,rotary,selector, manufactured by Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-778-1578 has 1 manufacturer part number on file: 8191E-4AS2 (Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division).
Key specifications for 8191E-4AS2: Flow Control Device: PORTED ROTOR; Maximum Operating Temp and Media for Which Designed: 160.0 FAHRENHEIT AIR DEGF; Operating Pressure and Type: 4000.0 POUNDS PER SQUARE INCH (PSI) AIR MAXIMUM REQUIRED LBS; Connection Type: THREADED INTERNAL BOSS. 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.