The Valve,check, cataloged under National Stock Number 4820-01-538-3907, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Allied Systems Company Dba Allied Systems Co. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-538-3907 |
| Primary Part Number | 48465 ITEM 4 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Allied Systems Company Dba Allied Systems Co |
| Status | ACTIVE |
| Connection Style | PLAIN, OPTIONAL END (PIPE) ALL ENDS |
| Connection Type | THREADED INTERNAL PIPE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Valve Size | 1.000 INCHES IN |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 0.563 INCHES ALL ENDS IN |
| Thread Class | 2A ALL ENDS A |
| Material | STEEL BODY |
| Thread Series Designator | UNF ALL ENDS |
| 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 |
|---|---|
| 48465 ITEM 4 | Allied Systems Company Dba Allied Systems Co (USA) |
| R10429901 | Allied Systems Company Dba Allied Systems Co (USA) |
| Reference | Meaning |
|---|---|
| C620S1-M | 3/9 Design control — primary reference Parker-Hannifin Corporation Dba Pneutronics Div Corporate Headquarters |
NSN 4820-01-538-3907 is a Valve,check, manufactured by Allied Systems Company Dba Allied Systems Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-538-3907 has 2 manufacturer part numbers on file: 48465 ITEM 4 (Allied Systems Company Dba Allied Systems Co), R10429901 (Allied Systems Company Dba Allied Systems Co).
Key specifications for 48465 ITEM 4: Connection Style: PLAIN, OPTIONAL END (PIPE) ALL ENDS; Connection Type: THREADED INTERNAL PIPE ALL ENDS; Style Designator: STRAIGHT THRU; Valve Size: 1.000 INCHES IN. 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.