The Valve,safety Relief, cataloged under National Stock Number 4820-01-434-8840, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Sun Hydraulics Corporation. Government technical data includes 12 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-434-8840 |
| Primary Part Number | RDDA-LCV-FEL |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Sun Hydraulics Corporation |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Connection Style | PLAIN (SCREW-IN CARTRIDGE) ALL ENDS |
| Connection Type | THREADED CARTRIDGE ALL ENDS |
| Style Designator | SCREW-IN CARTRIDGE |
| Operating Pressure | 6000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Adjustable Pressure Range | +1000.0 TO 6000.0 POUNDS PER SQUARE INCH LBS |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 0.750 INCHES ALL ENDS IN |
| Material | ALUMINUM BODY |
| Thread Series Designator | NPT ALL ENDS |
| Valve Discharge Flow Rate | 25.0 GALLONS PER MINUTE |
| 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 |
|---|---|
| RDDA-LCV-FEL PRIMARY | Sun Hydraulics Corporation (USA) |
NSN 4820-01-434-8840 is a Valve,safety Relief, manufactured by Sun Hydraulics Corporation, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-434-8840 has 1 manufacturer part number on file: RDDA-LCV-FEL (Sun Hydraulics Corporation).
Key specifications for RDDA-LCV-FEL: Flow Control Device: POPPET; Connection Style: PLAIN (SCREW-IN CARTRIDGE) ALL ENDS; Connection Type: THREADED CARTRIDGE ALL ENDS; Style Designator: SCREW-IN CARTRIDGE. 12 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.