The Valve,stop-Check, cataloged under National Stock Number 4820-00-045-5077, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc. Government technical data includes 18 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-045-5077 |
| Primary Part Number | 534-1-3-4IN |
| Item Name | Valve,stop-Check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Renewable Seat Ring Type | THREADED |
| Nominal Pipe Size Accommodated | 0.750 INCHES FIRST END IN |
| Connection Style | SOCKET (PIPE) FIRST END |
| Style Designator | ANGLE |
| Operating Pressure | 700.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Features Provided | BONNET PACKING |
| Bonnet Type | INSIDE SCREW |
| Maximum Operating Temp | 150.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | WEIGHT |
| Bonnet Attachment Method | THREADED |
| Media for Which Designed | WATER-OIL-GAS SINGLE RESPONSE |
| Test Data Document | 96169-2620-902ASSYF3/4 DRAWING (THIS IS THE BASIC GOVERNING DRAWING, SUCH AS A CONTRACTOR DRAWING, ORIGINAL EQUIPMENT MANUFACTURER DRAWING, ETC.; EXCLUDES ANY SPECIFICATION, STANDARD OR OTHER DOCUMENT THAT MAY BE REFERENCED IN A BASIC GOVERNING DRAWING) |
| Material | NICKEL ALLOY R-405 SEAT |
| Material | PLASTIC FLOW CONTROL DEVICE |
| Material | COPPER ALLOY 922 BODY |
| Material | NICKEL ALLOY R-405 STEM |
| Valve Operation Method | MANUAL |
| 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 |
|---|---|
| 534-1-3-4IN | Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc (USA) |
| 2620-902ASSYF3-4 | The Walworth Company (USA) |
| Reference | Meaning |
|---|---|
| 2620-902ASSYF3-4 | 5/9 Secondary reference U.S. Government activity |
| 845-1889587ASSYF3-4 | 3/1 Design control — primary reference U.S. Government activity |
NSN 4820-00-045-5077 is a Valve,stop-Check, manufactured by Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-045-5077 has 2 manufacturer part numbers on file: 534-1-3-4IN (Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc), 2620-902ASSYF3-4 (The Walworth Company).
Key specifications for 534-1-3-4IN: Flow Control Device: DISK; Renewable Seat Ring Type: THREADED; Nominal Pipe Size Accommodated: 0.750 INCHES FIRST END IN; Connection Style: SOCKET (PIPE) FIRST END. 18 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.