The Valve,safety Relief, cataloged under National Stock Number 4820-01-633-6938, 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 | 4820-01-633-6938 |
| Primary Part Number | RDDA-MCN |
| 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 Size | 22.2 MILLIMETERS MM |
| 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-MCN PRIMARY | Sun Hydraulics Corporation (USA) |
NSN 4820-01-633-6938 is a Valve,safety Relief, manufactured by Sun Hydraulics Corporation, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-633-6938 has 1 manufacturer part number on file: RDDA-MCN (Sun Hydraulics Corporation).
Key specifications for RDDA-MCN: Operating Pressure: 5000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS; Valve Size: 22.2 MILLIMETERS MM; Special Features: CAPACOTY 25GPM;PRESSURE SETTING ESTABLISHED AT FACTORY 4GPM;MAX OPERATING PRESSURE 5000PSI;RESPONSE TIME 2MS;VALVE HEX SIZE 7/8IN.;VALVE INSTALLATION TORQUE 30-35 LBS. FT.; ADJUSTMENT SCREW INTERNAL HEX SIZE 5/32IN.;ADJUSTMENT LOCKNUT HEX SIZE 9/16IN.; ADJUSTMENT NUT TORQUE 9/16 IN.; LBS; Part Name Assigned by Controlling Agency: PRESSURE RELIEF VALVE. 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.