The Valve,safety Relief, cataloged under National Stock Number 4820-00-956-6181, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Lunkenheimer Co. Government technical data includes 23 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 10 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-956-6181 |
| Primary Part Number | 1771 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Lunkenheimer Co |
| Status | ACTIVE |
| Bonnet Attachment Method | INTEGRAL |
| Nominal Pipe Size Accommodated | 1.500 INCHES SECOND END IN |
| Connection Style | PLAIN,OPTIONAL END(PIPE) FIRST END |
| Connection Type | THREADED INTERNAL PIPE FIRST END |
| Thread Series Designator | NPT FIRST END |
| Nominal Pipe Size Accommodated | 2.000 INCHES FIRST END IN |
| Thread Quantity Per Inch | 11-1/2 SECOND END |
| Thread Direction | RIGHT-HAND SECOND END |
| Disk Loading Method | SPRING |
| Connection Type | THREADED INTERNAL PIPE SECOND END |
| Thread Quantity Per Inch | 11-1/2 FIRST END |
| Nominal Thread Size | 1.500 INCHES SECOND END IN |
| Bonnet Type | INSIDE SPRING |
| Features Provided | BONNET PACKING AND PRESSURE TIGHT OUTLET SIDE |
| Thread Series Designator | NPT SECOND END |
| Thread Direction | RIGHT-HAND FIRST END |
| Flow Control Device | DISK |
| Connection Style | PLAIN,OPTIONAL END(PIPE) SECOND END |
| Opening Pressure Setting | 750.0 POUNDS PER SQUARE INCH LBS |
| Operating Pressure | 1300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Material | COPPER ALLOY OVERALL |
| Nominal Thread Size | 2.000 INCHES FIRST END IN |
| Style Designator | ANGLE |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 1771 | Lunkenheimer Co (USA) |
NSN 4820-00-956-6181 is a Valve,safety Relief, manufactured by Lunkenheimer Co, classified under FSC 4820 (No Item Name Available). Status: active.
NSN 4820-00-956-6181 has 1 cross-referenced part number: 1771 (Lunkenheimer Co).
There are 10 known substitutes for 4820-00-956-6181: 5905-00-045-9389, 4410-00-192-0875, 4730-00-273-9497 and 7 more. Verify interchangeability with system specifications before substitution.
Key specifications for 1771: Bonnet Attachment Method: INTEGRAL; Nominal Pipe Size Accommodated: 1.500 INCHES SECOND END IN; Connection Style: PLAIN,OPTIONAL END(PIPE) FIRST END; Connection Type: THREADED INTERNAL PIPE FIRST END. 23 total characteristics are documented in the Federal Logistics Information System.