| BONNET ATTACHMENT METHOD | BOLTED |
| BONNET TYPE | INSIDE SPRING |
| CONNECTION TYPE | THREADED EXTERNAL PIPE ALL ENDS |
| CONNECTION STYLE | PLAIN (TUBE) ALL ENDS |
| DISK LOADING METHOD | SPRING |
| FURNISHED ITEMS AND QUANTITY | 1 CAP AND 1 LOCKING DEVICE |
| FLOW CONTROL DEVICE | DISK |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | 1/2" RELIEF VALVE TYP 1551-T |
| MATERIAL DOCUMENT AND CLASSIFICATION | ASTMB-61 ASSN STD SINGLE MATERIAL RESPONSE BODY |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-N-281 OR ASTM B164 FED SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-N-281 OR ASTM B164 FED SPEC SINGLE MATERIAL RESPONSE SEAT |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-N-281 OR ASTM B164 FED SPEC SINGLE MATERIAL RESPONSE STEM |
| MATERIAL | COPPER ALLOY 922 BODY |
| MATERIAL | NICKEL ALLOY R-405 FLOW CONTROL DEVICE |
| MATERIAL | NICKEL ALLOY R-405 SEAT |
| MATERIAL | NICKEL ALLOY R-405 STEM |
| MAXIMUM OPERATING TEMP | 165.0 FAHRENHEIT SINGLE RESPONSE |
| MAXIMUM OPERATING PRESSURE | 400.0 POUNDS PER SQUARE INCH SINGLE RESPONSE |
| OPENING PRESSURE SETTING | 100.0 POUNDS PER SQUARE INCH |
| RENEWABLE SEAT RING TYPE | PRESSED-IN |
| STYLE DESIGNATOR | ANGLE |
| SPECIAL FEATURES | SPRING MATERIAL IS STAINLESS STEEL; VENT MUST BE OPEN TO ATMOSPHERE OR PIPED TO DOWNSTREAM PIPING |
| VALVE OPERATION METHOD | AUTOMATIC |