The Valve,safety Relief, cataloged under National Stock Number 4820-00-331-3537, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Circor Aerospace, Inc. Dba Circor Aerospace Inc. Government technical data includes 27 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 | 4820-00-331-3537 |
| Primary Part Number | P66-673 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Circor Aerospace, Inc. Dba Circor Aerospace Inc |
| Status | ACTIVE |
| Thread Direction | RIGHT-HAND FIRST ENDRIGHT-HAND FIRST END |
| Thread Series Designator | NPT SECOND ENDNPT FIRST END |
| Connection Type | THREADED EXTERNAL PIPE SECOND ENDTHREADED EXTERNAL PIPE SECOND END |
| Media for Which Designed | FUEL/OIL, HYDROCARBON SECOND RESPONSEAIR FIRST RESPONSE |
| Operating Pressure | 200.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Maximum Operating Temp | 250.0 FAHRENHEIT SINGLE RESPONSE250.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Connection Type | THREADED INTERNAL PIPE FIRST ENDTHREADED INTERNAL PIPE FIRST END |
| Connection Style | PLAIN,OPTIONAL END(PIPE) FIRST ENDPLAIN,OPTIONAL END(PIPE) FIRST END |
| Nominal Thread Size | 0.250 INCHES SECOND END0.250 INCHES SECOND END IN |
| Media for Which Designed | NITROGEN, GASEOUS THIRD RESPONSEFUEL/OIL, HYDROCARBON SECOND RESPONSE |
| Material | STEEL CORROSION RESISTING FLOW CONTROL DEVICE |
| Opening Pressure Setting | 20.0 POUNDS PER SQUARE INCH LBS |
| Media for Which Designed | NITROGEN, GASEOUS THIRD RESPONSE |
| Connection Style | PLAIN (PIPE) SECOND ENDPLAIN (PIPE) SECOND END |
| Thread Direction | RIGHT-HAND SECOND ENDRIGHT-HAND SECOND END |
| Thread Quantity Per Inch | 18 SECOND END18 SECOND END |
| Nominal Pipe Size Accommodated | 0.250 INCHES FIRST END0.250 INCHES FIRST END IN |
| Material | STEEL CORROSION RESISTING FLOW CONTROL DEVICECOPPER ALLOY SEAT |
| Disk Loading Method | SPRINGSPRING |
| Thread Series Designator | NPT SECOND END |
| Nominal Thread Size | 0.250 INCHES FIRST END0.250 INCHES FIRST END IN |
| Nominal Pipe Size Accommodated | 0.250 INCHES SECOND END0.250 INCHES SECOND END IN |
| Style Designator | STRAIGHT THRU |
| Flow Control Device | POPPETPOPPET |
| Valve Operation Method | AUTOMATICAUTOMATIC |
| Thread Quantity Per Inch | 18 FIRST END18 FIRST END |
| Material | COPPER ALLOY SEATCOPPER ALLOY BODY |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| P66-673 PRIMARY | Circor Aerospace, Inc. Dba Circor Aerospace Inc (USA) |
| 65A81C1037 | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier (USA) |
| 1634 PRIMARY | Rgi Inc Dba Rgi Inc (USA) |
NSN 4820-00-331-3537 is a Valve,safety Relief, manufactured by Circor Aerospace, Inc. Dba Circor Aerospace Inc, classified under FSC 4820 (No Item Name Available). Status: active.
NSN 4820-00-331-3537 has 3 cross-referenced part numbers: P66-673 (Circor Aerospace, Inc. Dba Circor Aerospace Inc), 65A81C1037 (Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier), 1634 (Rgi Inc Dba Rgi Inc).
There are 12 known substitutes for 4820-00-331-3537: 5305-00-012-1832, 6240-00-014-5416, 6240-00-057-1966 and 9 more. Verify interchangeability with system specifications before substitution.
Key specifications for P66-673: Thread Direction: RIGHT-HAND FIRST ENDRIGHT-HAND FIRST END; Thread Series Designator: NPT SECOND ENDNPT FIRST END; Connection Type: THREADED EXTERNAL PIPE SECOND ENDTHREADED EXTERNAL PIPE SECOND END; Media for Which Designed: FUEL/OIL, HYDROCARBON SECOND RESPONSEAIR FIRST RESPONSE. 27 total characteristics are documented in the Federal Logistics Information System.