The Valve,safety Relief, cataloged under National Stock Number 4820-01-537-6227, 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 7 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-537-6227 |
| Primary Part Number | RDDA-LCN |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Sun Hydraulics Corporation |
| Status | ACTIVE |
| Style Designator | SCREW-IN CARTRIDGE |
| Operating Pressure | 5000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Adjustable Pressure Range | +1000.0 TO 6000.0 POUNDS PER SQUARE INCH LBS |
| Material | STEEL OVERALL |
| Material | RUBBER POLYMETHYLENE-PERFLUOROALKYLENE CLASS FKM OR RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR PACKING |
| Opening Pressure Setting | 1000.0 POUNDS PER SQUARE INCH LBS |
| 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 |
|---|---|
| 1672680 | Asc Pty Ltd (AUS) |
| ND40532 | Pearson Engineering Limited (GBR) |
| RDDA-LCN PRIMARY | Sun Hydraulics Corporation (USA) |
| V06786500 | Mactaggart Scott & Co Ltd (GBR) |
| Reference | Meaning |
|---|---|
| 7592882 | 7/2 Vendor item drawing reference Naval Sea Systems Command |
NSN 4820-01-537-6227 is a Valve,safety Relief, manufactured by Sun Hydraulics Corporation, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-537-6227 has 4 manufacturer part numbers on file: 1672680 (Asc Pty Ltd), ND40532 (Pearson Engineering Limited), RDDA-LCN (Sun Hydraulics Corporation), V06786500 (Mactaggart Scott & Co Ltd).
Key specifications for RDDA-LCN: Style Designator: SCREW-IN CARTRIDGE; Operating Pressure: 5000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS; Adjustable Pressure Range: +1000.0 TO 6000.0 POUNDS PER SQUARE INCH LBS; Material: STEEL OVERALL. 7 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.