The Valve,restrictor Check, cataloged under National Stock Number 4820-00-185-9850, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Imi Cornelius Inc.. Government technical data includes 19 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-00-185-9850 |
| Primary Part Number | 311204000 |
| Item Name | Valve,restrictor Check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Imi Cornelius Inc. |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Connection Style | INVERTED FLARE (TUBE) FIRST END |
| Connection Style | BARBED-BEADED (HOSE) SECOND END |
| Connection Style | BARBED-BEADED (HOSE) THIRD END |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Connection Type | UNTHREADED EXTERNAL HOSE SECOND END |
| Connection Type | THREADED INTERNAL TUBE FIRST END |
| Connection Type | UNTHREADED EXTERNAL HOSE THIRD END |
| Nominal Outside Diameter Tube Accommodated | 0.250 INCHES FIRST END IN |
| Aperture Diameter | 0.062 INCHES NOMINAL IN |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.438 INCHES FIRST END IN |
| Seat Angle | 37.0 DEGREES FIRST END |
| Thread Class | 2B FIRST END |
| Material | PLASTIC SEAT |
| Material | PLASTIC BODY |
| Material | RUBBER SYNTHETIC FLOW CONTROL DEVICE |
| Thread Series Designator | UNF FIRST END |
| 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 |
|---|---|
| 311204000 PRIMARY | Imi Cornelius Inc. (USA) |
| Reference | Meaning |
|---|---|
| 311204 | 5/9 Secondary reference Imi Cornelius Inc. |
NSN 4820-00-185-9850 is a Valve,restrictor Check, manufactured by Imi Cornelius Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-185-9850 has 1 manufacturer part number on file: 311204000 (Imi Cornelius Inc.).
2 possible matches (shared part number, not a government interchangeability claim): 5905-00-866-2466, 5975-00-988-0649. Verify interchangeability with system specifications before substitution.
Key specifications for 311204000: Flow Control Device: DISK; Connection Style: INVERTED FLARE (TUBE) FIRST END; Connection Style: BARBED-BEADED (HOSE) SECOND END; Connection Style: BARBED-BEADED (HOSE) THIRD END. 19 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.