tailieunhanh - Instrumentation Symbols and Identification P2

ANSI/ (R 1992) Actuator symbols (contd.) ANSI/ (R 1992) 33 Symbols for self-actuated regulators, valves, and other devices 34 ANSI/ (R 1992) Symbols for self-actuated regulators, valves, and other devices (contd.) ANSI/ (R 1992) 35 | Control valve body symbols damper symbols Further information may be added adjacent to the body symbol either by note or code number. ANSI R 1992 31 Actuator symbols WITH OR WITHOUT POSITIONER OR OTHER PILOT PREFERRED FOR DIAPHRAGM ASSEMBLED WITH PILOT . ASSEMBLY IS ACTUATED BY ONE INPUT SHOWN TYPICALLY WITH ELECTRIC INPUT PREFERRED ALTERNATIVE DIAPHRAGM SPRING-OPPOSED OR UNSPECIFIED ACTUATOR DIAPHRAGM SPRING-OPPOSED WITH POSITIONER AND OVERRIDING PILOT VALVE THAT PRESSURIZES DIAPHRAGM WHEN ACTUATED DIAPHRAGM PRESSURE-BALANCED ROTARY MOTOR SHOWN TYPICALLY WITH ELECTRIC SIGNAL. MAY BE HYDRAULIC OR PNEUMATIC 8 DIGITAL 10 SPRING-OPPOSED SINGLE-ACTING DOUBLE-ACTING CYLINDER WITHOUT POSITIONER OR OTHER PILOT PREFERRED FOR ANY CYLINDER THAT IS ASSEMBLED WITH A PILOT SO THAT ASSEMBLY IS ACTUATED BY ONE CONTROLLED INPUT Pilot may be positioner solenoid valve signal converter etc. The positioner need not be shown unless an intermediate device is on its output. The positioner tagging ZC need not be used even if the positioner is shown. The positioner symbol a box drawn on the actuator shaft is the same for all types of actuators. When the symbol is used the type of instrument signal . pneumatic electric etc. is drawn as appropriate. If the positioner symbol is used and there is no intermediate device on its output then the positioner output signal need not be shown. The arrow represents the path from a common to a fail open port. It does not correspond necessarily to the direction of fluid flow. 32 ANSI R 1992 Actuator symbols contd. PREFERRED ALTERNATIVE. A BUBBLE WITH INSTRUMENT TAGGING . TY-I MAY BE USED INSTEAD OF THE INTERLOCK SYMBOL SINGLE-ACTING CYLINDER IMPLIED l P SOLENOID CYLINDER WITH POSITIONER AND OVERRIDING PILOT VALVE DUAL SOLENOIDS SWITCHING 4-WAY HYDRAULIC VALVE ELECTROHYDRAULIC VALVE ACTUATOR WITH ATTACHED ELECTROPNEUMATIC CONVERTER 18 19 R ----- MANUAL RESET - R REMOTE RESET LATCH-TYPE ACTUATOR WITH RESET SHOWN .