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		                        | National Stock Number:
 4820-00-485-4134
 
 Federal Supply Class:
 4820
 
 National Item Identification Number:
 004854134
 
 Description:
 VALVE,RELIEF,PRESSURE AND TEMPER
 
 Detail:
 A VALVE DESIGNED TO RELEASE UNDER EXCESSIVE PRESSURE AND/OR EXCESSIVE TEMPERATURE BY OPENING AT A PREDETERMINED PRESSURE AND/OR TEMPERATURE. THERMOSTATICALLY OPERATED VALVES CLOSE WHEN THE PRESSURE IS RELIEVED OR THE TEMPERATURE IS REDUCED. FUSIBLE PLUG VALVES REQUIRE REPLACEMENT OF THE PLUG. SEE ALSO VALVE, SAFETY RELIEF AND VALVE, REGULATING. TEMPERATURE.
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 Manufacturer Information:
 
 | 4048024-1 | 31468 | RYAN INDUSTRIES DIV OF CORDON INTERNATIONAL CORP |  | 4048024-1CP | 03950 | NAVAL INVENTORY CONTROL POINT MECHANICSBURG |  | 552AS137 | 30003 | NAVAL AIR SYSTEMS COMMAND MANAGED ORIGINAL DESIGN ACTIVITY  NOT MATERIAL/PARTS SUPPLIER | 
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 Techincal Specification:
 
 | CRITICALITY CODE JUSTIFICATION | ZZZY |  | REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICS | CLEANING, PACKAGING, AND MARKING IAW THE LATEST REVISION OF MIL-STD-1330 | 
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