| 
                            
                                |  |  
                                |   |  
		                        | National Stock Number:
 4820-01-551-1121
 
 Federal Supply Class:
 4820
 
 National Item Identification Number:
 015511121
 
 Description:
 VALVE,SAFETY RELIEF
 
 Detail:
 A valve designed to automatically release excessive pressures. It is actuated by static pressure upstream of the valve and is used as a safety valve or relief valve, and may be set to close at a predetermined pressure. It is not designed for regulation of continuously fluctuating loads. It may be inline or cartridge (manifold) design. Excludes VALVE (1), RELIEF, PRESSURE AND TEMPERATURE.
 |  
		                        | 
 Manufacturer Information:
 
 | D559B-2M-D-8 | 91816 | CIRCOR AEROSPACE, INC. | 
 |  
					            | 
 Techincal Specification:
 
 | STYLE DESIGNATOR | STRAIGHT THRU |  | VALVE OPERATION METHOD | AUTOMATIC |  | MATERIAL | COPPER ALLOY BODY |  | FLOW CONTROL DEVICE | POPPET |  | MEDIA FOR WHICH DESIGNED | AIR SINGLE RESPONSE |  | MAXIMUM OPERATING PRESSURE | 200.0 POUNDS PER SQUARE INCH SINGLE RESPONSE |  | MAXIMUM OPERATING TEMP | 275.0 DEG FAHRENHEIT SINGLE RESPONSE |  | CONNECTION TYPE | THREADED EXTERNAL PIPE 1ST END |  | CONNECTION STYLE | PLAIN (PIPE) 1ST END |  | THREAD SERIES DESIGNATOR | NPT 1ST END |  | NOMINAL THREAD SIZE | 0.250 INCHES 1ST END |  | THREAD DIRECTION | RIGHT-HAND 1ST END |  | DISK LOADING METHOD | SPRING |  | OPENING PRESSURE SETTING | 8.0 POUNDS PER SQUARE INCH |  | ADJUSTABLE PRESSURE RANGE | 5.6 TO 13.9 POUNDS PER SQUARE INCH |  | FURNISHED ITEMS AND QUANTITY | 1 DEFLECTOR CAP |  | MINIMUM OPERATING TEMP | -40.0 DEG FAHRENHEIT |  | SPECIAL FEATURES | ADJUSTABLE POPPET VALVE, ZERO LEAKAGE, OUT TO ATMOSHERE; TEMPERATURE RANGE DETERMINED MY SEAL MATERIAL |  | PART NAME ASSIGNED BY CONTROLLING AGENCY | ADJUSTABLE POPOFF RELIEF VALVE | 
 |  |