The Valve,check, cataloged under National Stock Number 4820-01-555-3474, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Chemetron Fire Systems. Government technical data includes 3 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 | 4820-01-555-3474 |
| Primary Part Number | 20610265 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Chemetron Fire Systems |
| Status | ACTIVE |
| Flow Control Device | PISTON |
| Style Designator | ANGLE |
| Material | COPPER ALLOY BODY |
| 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 |
|---|---|
| 20610265 PRIMARY | Chemetron Fire Systems (USA) |
NSN 4820-01-555-3474 is a Valve,check, manufactured by Chemetron Fire Systems, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-555-3474 has 1 manufacturer part number on file: 20610265 (Chemetron Fire Systems).
Key specifications for 20610265: Flow Control Device: PISTON; Style Designator: ANGLE; Special Features: THE NITROGEN CHECK VALVE IS INSTALLED AT THE INLET PORT TO THE WATER TANK. THE BODY MATERIAL IS BRASS. THE PLUNGER/PISTON ON THE SIDE OF THE CHECK VALVE WILL PROTRUDE WHEN THE VALVE IS OPEN AND WILL BE RECESSED WHEN THE VALVE IS CLOSED.; End Item Identification: FIRE PROTECTION SYSTEM, P/N 10540059 ONBOARD USCG 75 FT WLIC CLASS VESSELS FT. 3 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.