Tham khảo tài liệu 'instrumentation symbols and identification part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Symbols for self-actuated regulators valves and other devices contd. PRESSURE AND VACUUM RELIEF VALVE SPRING-OR WEIGHT-LOADED OR WITH INTEGRAL PILOT PRESSURE AND VACUUM RELIEF MANHOLE COVER PRESSURE RELIEF OR SAFETY VALVE ANGLE PATTERN TRIPPED BY INTEGRAL SOLENOID RUPTURE DISK OR SAFETY HEAD FOR PRESSURE RELIEF RUPTURE DISK OR SAFETY HEAD FOR VACUUM RELIEF 15 PILOT OPERATED RELIEF VALVE 2 3 1 TEMPERATURE REGULATOR FILLED-SYSTEM TYPE FUSIBLE PLUG OR DISK ALL TRAPS TRAP WITH EQUALIZING CONNECTION USER DEFINED TRAP Ỉ The solenlod-tripped pressure relief valve is one of the class of power-actuated relief valves and is grouped with the other types of relief valves even though it is not entirely a self-actuated device. 36 ANSI R 1992
