The Valve,restrictor Check, cataloged under National Stock Number 4820-00-494-9355, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Eaton Corporation Dba Eaton Inoac Div Eaton. Government technical data includes 17 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-494-9355 |
| Primary Part Number | C40552N1 |
| Item Name | Valve,restrictor Check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Eaton Corporation Dba Eaton Inoac Div Eaton |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Connection Style | PLAIN, OPTIONAL END (PIPE) ALL ENDS |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Connection Type | THREADED INTERNAL PIPE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Material Document and Classification | 66,AISI 303/SAE 30303 FED STD SINGLE MATERIAL RESPONSE BODY |
| Operating Pressure | 4500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Aperture Diameter | 0.250 INCHES NOMINAL IN |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 1.000 INCHES ALL ENDS IN |
| Disk Loading Method | SPRING |
| Media for Which Designed | AIR SINGLE RESPONSE |
| Material | STEEL CORROSION RESISTING FLOW CONTROL DEVICE |
| Material | RUBBER PACKING |
| Material | STEEL COMP 303 BODY |
| 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 |
|---|---|
| C40552N1 PRIMARY | Eaton Corporation Dba Eaton Inoac Div Eaton (USA) |
NSN 4820-00-494-9355 is a Valve,restrictor Check, manufactured by Eaton Corporation Dba Eaton Inoac Div Eaton, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-494-9355 has 1 manufacturer part number on file: C40552N1 (Eaton Corporation Dba Eaton Inoac Div Eaton).
Key specifications for C40552N1: Flow Control Device: DISK; Connection Style: PLAIN, OPTIONAL END (PIPE) ALL ENDS; Mounting Position: HORIZONTAL OR VERTICAL; Connection Type: THREADED INTERNAL PIPE ALL ENDS. 17 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.