The Valve,safety Relief, cataloged under National Stock Number 4820-00-467-4728, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Crane Co Div Valve Div. Government technical data includes 30 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4820-00-467-4728 |
| Primary Part Number | 2601 1-2 50LB |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Crane Co Div Valve Div |
| Status | ACTIVE |
| Flow Control Device | DISKDISK |
| Nominal Pipe Size Accommodated | 0.500 INCHES SECOND END0.500 INCHES SECOND END IN |
| Nominal Pipe Size Accommodated | 0.500 INCHES FIRST END0.500 INCHES FIRST END IN |
| Connection Style | PLAIN,OPTIONAL END(PIPE) FIRST ENDPLAIN,OPTIONAL END(PIPE) 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 INTERNAL PIPE FIRST ENDTHREADED INTERNAL PIPE FIRST END |
| Style Designator | ANGLE |
| Material Document and Classification | QQ-C-390,ALLOY B5 FED SPEC SINGLE MATERIAL RESPONSE SEAT |
| Material Document and Classification | QQ-C-390,ALLOY B5 FED SPEC SINGLE MATERIAL RESPONSE SEATQQ-C-390,ALLOY B6 FED SPEC SINGLE MATERIAL RESPONSE BODY |
| Operating Pressure | 250.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Features Provided | VALVE STEM LOCK SHIELD AND VALVE STEM LOCK SHIELD AND PRESSURE TIGHT OUTLET SIDEPRESSURE TIGHT OUTLET SIDE |
| Bonnet Type | INSIDE SPRINGINSIDE SPRING |
| Thread Direction | RIGHT-HAND SECOND ENDRIGHT-HAND SECOND END |
| Thread Direction | RIGHT-HAND FIRST ENDRIGHT-HAND FIRST END |
| Nominal Thread Size | 0.500 INCHES SECOND END0.500 INCHES SECOND END IN |
| Nominal Thread Size | 0.500 INCHES FIRST END0.500 INCHES FIRST END IN |
| Maximum Operating Temp | 406.0 FAHRENHEIT SINGLE RESPONSE406.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | SPRINGSPRING |
| Bonnet Attachment Method | THREADEDTHREADED |
| Media for Which Designed | STEAM SINGLE RESPONSE |
| Thread Quantity Per Inch | 14 SECOND END14 SECOND END |
| Thread Quantity Per Inch | 14 FIRST END14 FIRST END |
| Material | STEEL STEM |
| Material | COPPER ALLOY 836 SEATCOPPER ALLOY 836 BODY |
| Material | COPPER ALLOY FLOW CONTROL DEVICECOPPER ALLOY 836 SEAT |
| Material | STEEL STEMCOPPER ALLOY FLOW CONTROL DEVICE |
| Thread Series Designator | NPT SECOND END |
| Thread Series Designator | NPT SECOND ENDNPT FIRST END |
| Opening Pressure Setting | 50.0 POUNDS PER SQUARE INCH LBS |
| 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 |
|---|---|
| 2601 1-2 50LB PRIMARY | Crane Co Div Valve Div (USA) |
| 380019 PRIMARY | L & L Boiler Maintenance Inc (USA) |
| Reference | Meaning |
|---|---|
| 380019 | 5/9 Secondary reference D & J Parts Inc |
| 658 1-2 50LB | 5/9 Secondary reference Lunkenheimer Co |
NSN 4820-00-467-4728 is a Valve,safety Relief, manufactured by Crane Co Div Valve Div, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-467-4728 has 2 manufacturer part numbers on file: 2601 1-2 50LB (Crane Co Div Valve Div), 380019 (L & L Boiler Maintenance Inc).
Key specifications for 2601 1-2 50LB: Flow Control Device: DISKDISK; Nominal Pipe Size Accommodated: 0.500 INCHES SECOND END0.500 INCHES SECOND END IN; Nominal Pipe Size Accommodated: 0.500 INCHES FIRST END0.500 INCHES FIRST END IN; Connection Style: PLAIN,OPTIONAL END(PIPE) FIRST ENDPLAIN,OPTIONAL END(PIPE) FIRST END. 30 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.