The Valve,check, cataloged under National Stock Number 4820-01-138-7278, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Hydrasearch Company, Llc. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 3 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-138-7278 |
| Primary Part Number | 3C23UFLM-6 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Hydrasearch Company, Llc |
| Status | ACTIVE |
| Flow Control Device | BALL |
| Furnished Items and Quantity | 1 NUT AND 1 TAILPIECE |
| Connection Style | SOCKET (TUBE) SECOND END |
| Connection Style | PLAIN (TUBE) FIRST END |
| Mounting Position | HORIZONTAL |
| Connection Type | THREADED EXTERNAL TUBE FIRST END |
| Connection Type | UNTHREADED INTERNAL TUBE SECOND END |
| Style Designator | STRAIGHT THRU |
| Nominal Outside Diameter Tube Accommodated | 0.375 INCHES SECOND END IN |
| Operating Pressure | 6000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.562 INCHES FIRST END IN |
| Thread Class | 3A FIRST END A |
| Material | STEEL COMP 316 BODY |
| 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 |
|---|---|
| M23-6-UFLM-MPL445 | Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc (USA) |
| A-5320-3C23UFLM-6 | Hydrasearch Company, Llc (USA) |
| 3C23UFLM-6 PRIMARY | Hydrasearch Company, Llc (USA) |
| Reference | Meaning |
|---|---|
| W139475 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
NSN 4820-01-138-7278 is a Valve,check, manufactured by Hydrasearch Company, Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-138-7278 has 3 manufacturer part numbers on file: M23-6-UFLM-MPL445 (Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc), A-5320-3C23UFLM-6 (Hydrasearch Company, Llc), 3C23UFLM-6 (Hydrasearch Company, Llc).
Key specifications for 3C23UFLM-6: Flow Control Device: BALL; Furnished Items and Quantity: 1 NUT AND 1 TAILPIECE; Connection Style: SOCKET (TUBE) SECOND END; Connection Style: PLAIN (TUBE) FIRST END. 16 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.