The Valve,safety Relief, cataloged under National Stock Number 4820-01-145-9471, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Brand Hydraulics. Government technical data includes 13 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-145-9471 |
| Primary Part Number | RL-50 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Brand Hydraulics |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Connection Style | FLARE(TUBE) ALL ENDS |
| Connection Type | THREADED INTERNAL TUBE ALL ENDS |
| Style Designator | ANGLE |
| Nominal Outside Diameter Tube Accommodated | 0.500 INCHES ALL ENDS IN |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 0.750 INCHES ALL ENDS IN |
| Thread Class | 2B ALL ENDS |
| Thread Quantity Per Inch | 14 ALL ENDS |
| Material | STEEL BODY |
| Thread Series Designator | UNS ALL ENDS |
| Opening Pressure Setting | 1500.0 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 |
|---|---|
| RL-50 PRIMARY | Brand Hydraulics (USA) |
| Reference | Meaning |
|---|---|
| 5227-104 | C/1 Advisory reference — outside the item-of-supply concept Cemen Tech, Inc. |
| 5227-004 | C/1 Advisory reference — outside the item-of-supply concept Cemen Tech, Inc. |
NSN 4820-01-145-9471 is a Valve,safety Relief, manufactured by Brand Hydraulics, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-145-9471 has 1 manufacturer part number on file: RL-50 (Brand Hydraulics).
1 possible match (shared part number, not a government interchangeability claim): 2910-01-320-8033. Verify interchangeability with system specifications before substitution.
Key specifications for RL-50: Flow Control Device: DISK; Connection Style: FLARE(TUBE) ALL ENDS; Connection Type: THREADED INTERNAL TUBE ALL ENDS; Style Designator: ANGLE. 13 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.