The Valve,safety Relief, cataloged under National Stock Number 4820-00-406-6663, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division. Government technical data includes 28 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-406-6663 |
| Primary Part Number | 628XB-1-6-2 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division |
| Status | ACTIVE |
| Flow Control Device | POPPETPOPPET |
| Nominal Pipe Size Accommodated | 0.250 INCHES SECOND END0.250 INCHES SECOND END IN |
| Connection Style | FLARED (TUBE) FIRST ENDFLARED (TUBE) FIRST END |
| Connection Style | PLAIN (PIPE) SECOND ENDPLAIN (PIPE) SECOND END |
| Connection Type | THREADED EXTERNAL PIPE SECOND ENDTHREADED EXTERNAL PIPE SECOND END |
| Connection Type | THREADED EXTERNAL TUBE FIRST ENDTHREADED EXTERNAL TUBE FIRST END |
| Style Designator | ANGLE |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Nominal Outside Diameter Tube Accommodated | 0.375 INCHES FIRST END IN |
| Operating Pressure | 15.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Adjustable Pressure Range | +4.0 TO 15.0 POUNDS PER SQUARE INCH+4.0 TO 15.0 POUNDS PER SQUARE INCH LBS |
| Thread Direction | RIGHT-HAND SECOND ENDRIGHT-HAND SECOND END |
| Thread Direction | RIGHT-HAND FIRST ENDRIGHT-HAND FIRST END |
| Nominal Thread Size | 0.250 INCHES SECOND END0.250 INCHES SECOND END IN |
| Nominal Thread Size | 0.562 INCHES FIRST END0.562 INCHES FIRST END IN |
| Seat Angle | 45.0 DEGREES FIRST END |
| Maximum Operating Temp | 225.0 FAHRENHEIT SINGLE RESPONSE225.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | SPRINGSPRING |
| Surface Treatment | ANODIZE LOCATION NOT OTHERWISE SPECIFIED |
| Media for Which Designed | WATER-OIL-GAS SINGLE RESPONSE |
| Thread Class | 3A FIRST END3A FIRST END A |
| Thread Quantity Per Inch | 18 FIRST END18 FIRST END |
| Material | STEEL COMP 316 FLOW CONTROL DEVICE |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE SEATALUMINUM ALLOY BODY |
| Material | STEEL COMP 316 FLOW CONTROL DEVICEPLASTIC POLYTETRAFLUOROETHYLENE SEAT |
| Thread Series Designator | ANPT SECOND END |
| Thread Series Designator | ANPT SECOND ENDUNF FIRST END |
| Valve Operation Method | AUTOMATICAUTOMATIC |
| 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 |
|---|---|
| 628XB-1-6-2 PRIMARY | Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division (USA) |
| Reference | Meaning |
|---|---|
| 628XB1-6-2 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-00-406-6663 is a Valve,safety Relief, manufactured by Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-406-6663 has 1 manufacturer part number on file: 628XB-1-6-2 (Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division).
Key specifications for 628XB-1-6-2: Flow Control Device: POPPETPOPPET; Nominal Pipe Size Accommodated: 0.250 INCHES SECOND END0.250 INCHES SECOND END IN; Connection Style: FLARED (TUBE) FIRST ENDFLARED (TUBE) FIRST END; Connection Style: PLAIN (PIPE) SECOND ENDPLAIN (PIPE) SECOND END. 28 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.