The Valve,safety Relief, cataloged under National Stock Number 4820-00-918-4433, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Rgi Inc Dba Rgi Inc. Government technical data includes 17 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-918-4433 |
| Primary Part Number | 317659-2 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Rgi Inc Dba Rgi Inc |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Connection Style | FLARE(TUBE) FIRST END |
| Connection Type | THREADED INTERNAL TUBE FIRST END |
| Style Designator | STRAIGHT THRU |
| Nominal Outside Diameter Tube Accommodated | 0.500 INCHES FIRST END IN |
| Operating Pressure | 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Bonnet Type | PACKING RETAINING |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.750 INCHES FIRST END IN |
| Disk Loading Method | SPRING |
| Media for Which Designed | OIL, HYDRAULIC SINGLE RESPONSE |
| Thread Class | 3B FIRST END |
| Material | STEEL BODY |
| Material | STEEL CORROSION RESISTING SEAT |
| Thread Series Designator | UNF FIRST END |
| Opening Pressure Setting | 225.0 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 | S |
| Part Number | Manufacturer |
|---|---|
| 317659-2 | Rgi Inc Dba Rgi Inc (USA) |
| Reference | Meaning |
|---|---|
| 317659-2 | 3/2 Design control — primary reference U.S. Government activity |
| 317659-2 | 5/9 Secondary reference Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division |
NSN 4820-00-918-4433 is a Valve,safety Relief, manufactured by Rgi Inc Dba Rgi Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-918-4433 has 1 manufacturer part number on file: 317659-2 (Rgi Inc Dba Rgi Inc).
Key specifications for 317659-2: Flow Control Device: POPPET; Connection Style: FLARE(TUBE) FIRST END; Connection Type: THREADED INTERNAL TUBE FIRST END; Style Designator: STRAIGHT THRU. 17 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.