The Valve,check, cataloged under National Stock Number 4820-01-689-3346, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Stauffer Diesel, Inc. Dba Stauffer Diesel Inc. Government technical data includes 14 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-689-3346 |
| Primary Part Number | 56735 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Stauffer Diesel, Inc. Dba Stauffer Diesel Inc |
| Status | ACTIVE |
| Connection Type | THREADED EXTERNAL PIPE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Valve Size | 0.500 INCHES IN |
| Nominal Thread Size | 0.500 INCHES ALL ENDS IN |
| Face to Face Distance | 66.0 MILLIMETERS MM |
| Media for Which Designed | OIL SINGLE RESPONSE |
| Thread Quantity Per Inch | 14 ALL ENDS |
| Material | COPPER ALLOY BODY |
| Material | STEEL CORROSION RESISTING FLOW CONTROL DEVICE |
| Material | COPPER ALLOY STEM |
| Material | RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR PACKING |
| Material | PLASTIC TETRAFLUOROETHYLENE SEAT |
| Thread Series Designator | NPT 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 |
|---|---|
| 56735 PRIMARY | Stauffer Diesel, Inc. Dba Stauffer Diesel Inc (USA) |
| Reference | Meaning |
|---|---|
| 31000-541 | 3/1 Design control — primary reference Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier |
| T202N | D/9 Drawing number reference only Fumoto Engineering of America Inc |
NSN 4820-01-689-3346 is a Valve,check, manufactured by Stauffer Diesel, Inc. Dba Stauffer Diesel Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-689-3346 has 1 manufacturer part number on file: 56735 (Stauffer Diesel, Inc. Dba Stauffer Diesel Inc).
Key specifications for 56735: Connection Type: THREADED EXTERNAL PIPE ALL ENDS; Style Designator: STRAIGHT THRU; Valve Size: 0.500 INCHES IN; Nominal Thread Size: 0.500 INCHES ALL ENDS IN. 14 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.