The Valve,safety Relief, cataloged under National Stock Number 4820-01-171-4392, 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 16 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-171-4392 |
| Primary Part Number | 20210H51M |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
| Status | ACTIVE |
| Valve Operation Method | AUTOMATIC |
| Criticality Code Justification | ZZZY |
| Material | NICKEL ALLOY 400 OR NICKEL ALLOY R-405 FLOW CONTROL DEVICE |
| Style Designator | ANGLE |
| Material | NICKEL ALLOY 400 OR NICKEL ALLOY R-405 SEAT |
| Connection Style | GASKET SEAL (PIPE) FIRST END |
| Material | NICKEL ALLOY 400 OR NICKEL ALLOY R-405 STEM |
| Connection Type | UNTHREADED INTERNAL PIPE FIRST END |
| Disk Loading Method | SPRING |
| Bonnet Attachment Method | BOLTED |
| Bonnet Type | INSIDE SPRING |
| Material | COPPER ALLOY 922 BODY |
| Flow Control Device | DISK |
| Nominal Pipe Size Accommodated | 0.500 INCHES FIRST END IN |
| Adjustable Pressure Range | +45.0 TO 55.0 POUNDS PER SQUARE INCH LBS |
| Reference Number Differentiating Characteristics | CLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 20210H51M | Anderson Greenwood Lp Dba Anderson Greenwood Crosby (USA) |
| 20210H51MCP | Naval Inventory Control Point Mechanicsburg (USA) |
| 20210H51MCP | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA) |
| 20210H51M | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA) |
NSN 4820-01-171-4392 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 4820-01-171-4392 has 4 cross-referenced part numbers: 20210H51M (Anderson Greenwood Lp Dba Anderson Greenwood Crosby), 20210H51MCP (Naval Inventory Control Point Mechanicsburg), 20210H51MCP (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team), 20210H51M (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team).
There is 1 known substitute for 4820-01-171-4392: 4820-01-198-1104. Verify interchangeability with system specifications before substitution.
Key specifications for 20210H51M: Valve Operation Method: AUTOMATIC; Criticality Code Justification: ZZZY; Material: NICKEL ALLOY 400 OR NICKEL ALLOY R-405 FLOW CONTROL DEVICE; Style Designator: ANGLE. 16 total characteristics are documented in the Federal Logistics Information System.