The Valve,check, cataloged under National Stock Number 4820-01-013-3291, 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 13 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-013-3291 |
| Primary Part Number | C49770 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Eaton Corporation Dba Eaton Inoac Div Eaton |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Nominal Pipe Size Accommodated | 0.250 INCHES ALL ENDS IN |
| Connection Style | SOCKET WITH BRAZING RING (PIPE) ALL ENDS |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Connection Type | UNTHREADED INTERNAL PIPE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Operating Pressure | 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Maximum Operating Temp | 160.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | SPRING |
| Media for Which Designed | WATER-OIL-GAS SINGLE RESPONSE |
| Material | STEEL COMP 416 FLOW CONTROL DEVICE |
| Material | STEEL COMP 303 BODY |
| 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 |
|---|---|
| C49770 PRIMARY | Eaton Corporation Dba Eaton Inoac Div Eaton (USA) |
| Reference | Meaning |
|---|---|
| 49770 | C/1 Advisory reference — outside the item-of-supply concept Eaton Corporation Dba Eaton Inoac Div Eaton |
| 2621-908-05 | D/9 Drawing number reference only U.S. Government activity |
| 2621-908-05ASSYBA1-4INL1 | 5/9 Secondary reference Eaton Corporation Dba Eaton Inoac Div Eaton |
| 2621-908-05ASSY | C/1 Advisory reference — outside the item-of-supply concept Eaton Corporation Dba Eaton Inoac Div Eaton |
NSN 4820-01-013-3291 is a Valve,check, manufactured by Eaton Corporation Dba Eaton Inoac Div Eaton, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-013-3291 has 1 manufacturer part number on file: C49770 (Eaton Corporation Dba Eaton Inoac Div Eaton).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-137-1018, 5330-01-362-3428. Verify interchangeability with system specifications before substitution.
Key specifications for C49770: Flow Control Device: DISK; Nominal Pipe Size Accommodated: 0.250 INCHES ALL ENDS IN; Connection Style: SOCKET WITH BRAZING RING (PIPE) ALL ENDS; Mounting Position: HORIZONTAL OR VERTICAL. 13 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.