The Valve,safety Relief, cataloged under National Stock Number 4820-01-556-8005, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Dante Valve Company. Government technical data includes 16 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-556-8005 |
| Primary Part Number | NDSXX04SDD |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Dante Valve Company |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Furnished Items and Quantity | 1 LEVER AND 2 TAILPIECE AND 2 NUT |
| Renewable Seat Ring Type | RETAINING SCREW |
| Nominal Pipe Size Accommodated | 0.750 INCHES ALL ENDS IN |
| Connection Style | SOCKET ALL ENDS |
| Connection Type | UNTHREADED INTERNAL PIPE ALL ENDS |
| Style Designator | ANGLE |
| Operating Pressure | 400.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Adjustable Pressure Range | +23.0 TO 45.0 POUNDS PER SQUARE INCH LBS |
| Specification/standard Data | MIL-V-22549D GOVERNMENT SPECIFICATION |
| Maximum Operating Temp | 425.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | SPRING |
| Media for Which Designed | AIR SINGLE RESPONSE |
| Material | STEEL CORROSION RESISTING OVERALL |
| Valve Discharge Flow Rate | 172.8 CUBIC FEET PER MINUTE |
| Valve Operation Method | AUTOMATIC OR 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 |
|---|---|
| NDSXX04SDD PRIMARY | Dante Valve Company (USA) |
| DN3400-SW ASSY NDSXX04SDD | Dante Valve Company (USA) |
| Reference | Meaning |
|---|---|
| MIL-V-22549D | 4/1 Identification reference U.S. Government activity |
| DN3400-SW ASSY NDSXX04SDD | 5/9 Secondary reference Danco Valve Company |
| NDSXX04SDD | 3/9 Design control — primary reference Danco Valve Company |
NSN 4820-01-556-8005 is a Valve,safety Relief, manufactured by Dante Valve Company, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-556-8005 has 2 manufacturer part numbers on file: NDSXX04SDD (Dante Valve Company), DN3400-SW ASSY NDSXX04SDD (Dante Valve Company).
Key specifications for NDSXX04SDD: Flow Control Device: DISK; Furnished Items and Quantity: 1 LEVER AND 2 TAILPIECE AND 2 NUT; Renewable Seat Ring Type: RETAINING SCREW; Nominal Pipe Size Accommodated: 0.750 INCHES ALL ENDS IN. 16 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.