The Valve,safety Relief, cataloged under National Stock Number 4820-01-680-6562, 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 2 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 | 4820-01-680-6562 |
| Primary Part Number | RDHA-LDN |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Sun Hydraulics Corporation |
| Status | ACTIVE |
| Operating Pressure | 5000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Valve Discharge Flow Rate | 100.0 GALLONS PER MINUTE |
| 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 |
|---|---|
| RDHA-LDN PRIMARY | Sun Hydraulics Corporation (USA) |
NSN 4820-01-680-6562 is a Valve,safety Relief, manufactured by Sun Hydraulics Corporation, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-680-6562 has 1 manufacturer part number on file: RDHA-LDN (Sun Hydraulics Corporation).
Key specifications for RDHA-LDN: Operating Pressure: 5000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS; Special Features: SEAL MATERIAL BUNA-N, CONTROL STANDARD SCREW ADJUSTMENT, ADJUSTMENT - NUMBER OF CW TURNS FROM MIN. TO MAX. SETTING 6, MAXIMUM OPERATING PRESSURE 5000 PSI, CAVITY T-16A, MAXIMUM VALVE LEAKAGE AT RESEAT 10 DROPS/MIN., LOCKNUT HEX SIZE 9/16 IN., ADJUSTMENT RANGE 200 - 800 PSI (14 - 55 BAR), 400 PSI (28 BAR) STANDARD SETTING, FACTORY PRESSURE SETTINGS ESTABLISHED AT 4 GPM, RESPONSE TIME - TYPICAL 2 MS A; Part Name Assigned by Controlling Agency: DIRECT-ACTING RELIEF VALVE; Valve Discharge Flow Rate: 100.0 GALLONS PER MINUTE. 2 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.