The Valve,safety Relief, cataloged under National Stock Number 4820-00-845-4168, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Us Army Aviation and Missile Command. Government technical data includes 22 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 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 | 4820-00-845-4168 |
| Primary Part Number | 9975258 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Us Army Aviation and Missile Command |
| Status | ACTIVE |
| Operating Pressure | 350.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Style Designator | ANGLE |
| Adjustable Pressure Range | +301.0 TO 350.0 POUNDS PER SQUARE INCH LBS |
| Thread Series Designator | NPTF FIRST END |
| Bonnet Type | INSIDE SPRING |
| Valve Discharge Flow Rate | 504.0 POUNDS PER HOUR LBS |
| Nominal Pipe Size Accommodated | 0.250 INCHES FIRST END IN |
| Media for Which Designed | STEAM SINGLE RESPONSE |
| Nominal Thread Size | 0.250 INCHES FIRST END IN |
| Bonnet Attachment Method | INTEGRAL |
| Maximum Operating Temp | 200.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | SPRING |
| Flow Control Device | POPPET |
| Valve Operation Method | AUTOMATIC |
| Connection Type | THREADED EXTERNAL PIPE FIRST END |
| Material | STEEL SEAT |
| Connection Style | PLAIN (PIPE) FIRST END |
| Thread Quantity Per Inch | 18 FIRST END |
| Thread Direction | RIGHT-HAND FIRST END |
| Material | COPPER ALLOY BODY |
| Features Provided | VALVE STEM LOCK SHIELD AND BONNET PACKING |
| Material | COPPER ALLOY STEM |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
NSN 4820-00-845-4168 is a Valve,safety Relief, manufactured by Us Army Aviation and Missile Command, classified under FSC 4820 (No Item Name Available). Status: active.
NSN 4820-00-845-4168 has 3 cross-referenced part numbers: 5221 (Henry Technologies, Inc.), 9975258 (Us Army Aviation and Missile Command), 3001 (Snowbird Technologies Inc.).
There are 12 known substitutes for 4820-00-845-4168: 3110-00-100-0496, 5975-00-100-8716, 5330-00-171-9010 and 9 more. Verify interchangeability with system specifications before substitution.
Key specifications for 9975258: Operating Pressure: 350.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS; Style Designator: ANGLE; Adjustable Pressure Range: +301.0 TO 350.0 POUNDS PER SQUARE INCH LBS; Thread Series Designator: NPTF FIRST END. 22 total characteristics are documented in the Federal Logistics Information System.