The Valve,check, cataloged under National Stock Number 4820-01-523-3206, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Western Methods Machinery Corporation Dba Western Methods. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-523-3206 |
| Primary Part Number | S1620C |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Western Methods Machinery Corporation Dba Western Methods |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Flange Shape | OVAL WITH HOLES ALL ENDS |
| Nominal Length | 11.000 INCHES ALL ENDS IN |
| Minimum Operating Temp | 100.0 FAHRENHEIT DEGF |
| Connection Type | FLANGE ALL ENDS |
| Bolt Hole Nominal Diameter | 0.875 INCHES ALL ENDS IN |
| Operating Pressure | 275.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Bolt Hole Quantity | 2 ALL ENDS |
| Material | STEEL BODY |
| Nominal Thickness | 1.000 INCHES ALL ENDS IN |
| 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 |
|---|---|
| S1620C PRIMARY | Western Methods Machinery Corporation Dba Western Methods (USA) |
| 5021-2 ASSY S1620C | Western Methods Machinery Corporation Dba Western Methods (USA) |
NSN 4820-01-523-3206 is a Valve,check, manufactured by Western Methods Machinery Corporation Dba Western Methods, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-523-3206 has 2 manufacturer part numbers on file: S1620C (Western Methods Machinery Corporation Dba Western Methods), 5021-2 ASSY S1620C (Western Methods Machinery Corporation Dba Western Methods).
Key specifications for S1620C: Flow Control Device: DISK; Flange Shape: OVAL WITH HOLES ALL ENDS; Nominal Length: 11.000 INCHES ALL ENDS IN; Minimum Operating Temp: 100.0 FAHRENHEIT DEGF. 10 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.