The Valve,safety Relief, cataloged under National Stock Number 4820-01-134-2803, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Emerson Automation Solutions Final Control Us Lp Div Navy Product Team. Government technical data includes 26 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 5 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-134-2803 |
| Primary Part Number | 20285R51M |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team |
| Status | ACTIVE |
| Operating Pressure | 150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Material Document and Classification | QQ-C-390,ALLOY D4/D/ FED SPEC SINGLE MATERIAL RESPONSE BODY |
| Flange Face Design | PLAIN FIRST END |
| Nominal Outside Diameter | 3.875 INCHES FIRST END IN |
| Style Designator | ANGLE |
| Material Document and Classification | QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE SEAT |
| Material | COPPER ALLOY BODY |
| Connection Type | FLANGE FIRST END |
| Bonnet Attachment Method | BOLTED |
| Material | NICKEL ALLOY SEAT |
| Flange Shape | ROUND FIRST END |
| Media for Which Designed | AIR FIRST RESPONSE |
| Connection Type | UNTHREADED INTERNAL TUBE SECOND END |
| Connection Style | STREAMLINED WITH ONE BRAZING RING (TUBE) SECOND END |
| Material | NICKEL ALLOY FLOW CONTROL DEVICE |
| Valve Operation Method | AUTOMATIC |
| Adjustable Pressure Range | +151.0 TO 180.0 POUNDS PER SQUARE INCH LBS |
| Maximum Operating Temp | 150.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Bonnet Type | INSIDE SPRING |
| Material | NICKEL ALLOY STEM |
| Nominal Outside Diameter Tube Accommodated | 0.750 INCHES SECOND END IN |
| Media for Which Designed | GAS, INERT SECOND RESPONSE |
| Material Document and Classification | QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE STEM |
| Material Document and Classification | QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Flow Control Device | DISK |
| Nominal Thickness | 0.344 INCHES FIRST END IN |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 20285R51M PRIMARY | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA) |
| 20285 PRIMARY | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA) |
| 20285 | Anderson Greenwood Lp Dba Anderson Greenwood Crosby (USA) |
| 10347159 | Nimikkeistokeskus Ncb Finland (FIN) |
| 20285R51M | Anderson Greenwood Lp Dba Anderson Greenwood Crosby (USA) |
NSN 4820-01-134-2803 is a Valve,safety Relief, manufactured by Emerson Automation Solutions Final Control Us Lp Div Navy Product Team, classified under FSC 4820 (No Item Name Available). Status: active.
NSN 4820-01-134-2803 has 5 cross-referenced part numbers: 20285R51M (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team), 20285 (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team), 20285 (Anderson Greenwood Lp Dba Anderson Greenwood Crosby), 10347159 (Nimikkeistokeskus Ncb Finland), 20285R51M (Anderson Greenwood Lp Dba Anderson Greenwood Crosby).
There are 12 known substitutes for 4820-01-134-2803: 5841-00-338-1763, 5950-00-647-5260, 4820-01-150-3821 and 9 more. Verify interchangeability with system specifications before substitution.
Key specifications for 20285R51M: Operating Pressure: 150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS; Material Document and Classification: QQ-C-390,ALLOY D4/D/ FED SPEC SINGLE MATERIAL RESPONSE BODY; Flange Face Design: PLAIN FIRST END; Nominal Outside Diameter: 3.875 INCHES FIRST END IN. 27 total characteristics are documented in the Federal Logistics Information System.