The Valve,safety Relief, cataloged under National Stock Number 4820-01-021-2757, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Anderson Greenwood Lp Dba Anderson Greenwood Crosby. Government technical data includes 27 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-021-2757 |
| Primary Part Number | 84-4S 3/4X1-1/4-50 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
| Status | ACTIVE |
| Disk Loading Method | SPRING |
| Valve Operation Method | AUTOMATIC |
| Renewable Seat Ring Type | THREADED |
| Operating Pressure | 250.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FIRST RESPONSE LBS |
| Bonnet Type | INSIDE SPRING |
| Media for Which Designed | STEAM FIRST RESPONSE |
| Connection Style | PLAIN,OPTIONAL END(PIPE) SECOND END |
| Maximum Operating Temp | 300.0 FAHRENHEIT SECOND RESPONSE DEGF |
| Bonnet Attachment Method | THREADED |
| Connection Type | THREADED EXTERNAL PIPE FIRST END |
| Maximum Operating Temp | 406.0 FAHRENHEIT FIRST RESPONSE DEGF |
| Connection Type | THREADED INTERNAL PIPE SECOND END |
| Nominal Thread Size | 0.750 INCHES FIRST END IN |
| Style Designator | ANGLE |
| Thread Series Designator | NPT SECOND END |
| Opening Pressure Setting | 50.0 POUNDS PER SQUARE INCH LBS |
| Operating Pressure | 50.0 POUNDS PER SQUARE INCH (PSI) NOMINAL POWER DRIVE LBS |
| Media for Which Designed | GAS, INERT THIRD RESPONSE |
| Material | STEEL CORROSION RESISTING BODY |
| Operating Pressure | 300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SECOND RESPONSE LBS |
| Nominal Thread Size | 1.250 INCHES SECOND END IN |
| Connection Style | PLAIN (PIPE) FIRST END |
| Thread Direction | RIGHT-HAND SECOND END |
| Thread Series Designator | NPT FIRST END |
| Media for Which Designed | AIR SECOND RESPONSE |
| Flow Control Device | POPPET |
| Thread Direction | RIGHT-HAND FIRST END |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 84-S 3/4MX1-1/4F-50 | Anderson Greenwood Lp Dba Anderson Greenwood Crosby (USA) |
| 84-S | Anderson Greenwood Lp Dba Anderson Greenwood Crosby (USA) |
| 84-4S 3/4X1-1/4-50 PRIMARY | Anderson Greenwood Lp Dba Anderson Greenwood Crosby (USA) |
NSN 4820-01-021-2757 is a Valve,safety Relief, manufactured by Anderson Greenwood Lp Dba Anderson Greenwood Crosby, classified under FSC 4820 (No Item Name Available). Status: active.
NSN 4820-01-021-2757 has 3 cross-referenced part numbers: 84-S 3/4MX1-1/4F-50 (Anderson Greenwood Lp Dba Anderson Greenwood Crosby), 84-S (Anderson Greenwood Lp Dba Anderson Greenwood Crosby), 84-4S 3/4X1-1/4-50 (Anderson Greenwood Lp Dba Anderson Greenwood Crosby).
There are 2 known substitutes for 4820-01-021-2757: 4730-00-032-1522, 2530-00-293-4307. Verify interchangeability with system specifications before substitution.
Key specifications for 84-4S 3/4X1-1/4-50: Disk Loading Method: SPRING; Valve Operation Method: AUTOMATIC; Renewable Seat Ring Type: THREADED; Operating Pressure: 250.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FIRST RESPONSE LBS. 27 total characteristics are documented in the Federal Logistics Information System.