Process and Instrument Diagram Legend and Details Model – Valves, Signals, Checks, Relays, Reliefs, Dampers, Drains and More
– NORMALLY OPEN VALVE
– NORMALLY CLOSED VALVE
– GATE WITH HAND CONTROL
– ANGLE
– BUTTERFLY
– BALL
– GLOBE
– IN-LINE SAFETY
– FLOAT
– NEEDLE
– THREE WAY
– FOUR WAY
– CHECK
– STOP CHECK
– AIR ASSISTED CHECK
– SPRING OPERATED CHECK
– COCK VALVE
– QUICK CONNECT AIR HOSE COUPLING
– PLUG VALVE
– AUTOMATIC FLOW CONTROL VALVE
– DIAPHRAGM VALVE
– ECCENTRIC PLUG VALVE
– PINCH VALVE
– BALANCING VALVE
– ECCENTRIC ROTARY VALVE
– DIAPHRAGM OPERATED
– BALANCED DIAPHRAGM
– DIAPHRAGM OPERATED WITH POSITIONER
– DIAPHRAGM OPERATED WITH POSITIONER, FAIL CLOSE
– DIAPHRAGM OPERATED WITH POSITIONER, FAIL OPEN
– DIAPHRAGM OPERATED VALVE WITH HAND ADJUSTMENT, FAIL CLOSED
– MOTOR OPERATED
ACTUATOR SYMBOLS
– PRESSURE REGULATOR, SELF CONTAINED
– BACK PRESSURE REGULATOR, SELF CONTAINED
– PRESSURE REGULATOR, SELF CONTAINED WITH HAND ADJUSTMENT
– PRESSURE REGULATOR, EXTERNAL TAP
– BACK PRESSURE REGULATOR, EXTERNAL TAP
– PRESSURE RELIEF OR SAFETY
– VACUUM RELIEF
– TEMPERATURE SAFETY VALVE
– FLOAT LEVEL VALVE
– SOLENOID ACTIVATED (DIRECTLY IN THE PROCESS/ON INSTRUMENT AIR LINE TO DIAPHRAGM OR CYLINDER VALVE)
– THREE WAY SOLENOID ACTIVATED(DIRECTLY IN THE PROCESS/ON INSTRUMENT AIR LINE TO DIAPHRAGM OR CYLINDER VALVE)
– CYLINDER OPERATED
– FOUR-WAY SOLENOID ACTUATED
– CYLINDER OPERATED WITH POSITIONER
– DOUBLE ACTING CYLINDER
INSTRUMENT LINE SYMBOLS
– INSTRUMENT SUPPLY OR CONNECTION TO PROCESS
– PNEUMATIC SIGNAL
– ELECTRIC SIGNAL
– HYDRAULIC SIGNAL
– CAPILLARY TUBE
– ELECTROMAGNETIC OR SONIC SIGNAL GUIDED
– ELECTROMAGNETIC OR SONIC SIGNAL UNGUIDED
– ELECTRIC BINARY (ON/OFF) SIGNAL (OPTIONAL)
– PNEUMATIC BINARY SIGNAL (OPTIONAL)
– DATA / SERIAL LINK (OPTIONAL)
CONNECTING ARROWS
– PROCESS / SIGNAL CONTINUATION ON INDICATED DRAWING
– SIGNAL CONTINUATION ON SAME DRAWING
– EDUCTOR
– REHEAT COIL
– THERMAL DISPERSION FLOW METER
– MAGNETIC FLOW METER
– FLAME ARRESTER
– PRESSURE ARRESTER
– FLEX PIPE
– HOSE REEL
– LOW LIMIT
– STRAINER
– AIR FILTER
– SEWER VALVE
– HVAC DUAL DUCT TERMINAL UNIT
– VOLTAGE / PNEUMATIC RELAY
– VOLTAGE / CURRENT RELAY
– HEAT EXCHANGER
– COOLING COIL
– DIRECT EXPANSION (EVAPORATOR)
– HEATING COIL
– ELECTRIC HEATING COIL
– CONDENSOR
– TRAP
– S-TRAP PRESSURE RELIEF
– VENT TO ATMOSPHERE
– FLOW CONTROL VALVE RESTRICTED FLOW LEFT FREE FLOW RIGHT
– FCV
– RUPTURE DISC
– HEAT TRACING
– AIR VENT
– DIAPHRAGM SEAL
– AIR INTAKE / RELEASE
– FLOW NOZZLE
– MIXER
– DUPLEX STRAINER
– VORTEX FLOW METER
– VARIABLE AREA FLOW INDICATOR (ROTAMETER)
– MIX TEE
– AVERAGING PITOT TUBE
– SINGLE PORT PITOT TUBE
– VENTURI TUBE
– EXPANSION JOINT
– FILTER
ACCESSORY DEVICE SYMBOLS
– ORIFICE PLATE
– FLANGE
– PIPE REDUCER
– DAMPER
– BACKDRAFT DAMPER
– PUMP
– BLOWER / FAN
– MOTOR
– DRAIN
– UNION
– TEMPERATURE ELEMENT WITH THERMOWELL
– SCREWED CAP
– HOSE CONNECTION
– BLIND FLANGE
– W = WHITE ,R = RED ,G = GREEN ,A = AMBER ,B = BLUE ,Y = YELLOW
– PILOT LIGHT (FIELD)
– PILOT LIGHT CONTROL ROOM)
– PILOT LIGHT (FIELD PANEL)
– PILOT LIGHT (FIELD PANEL, REAR MOUNTED)
– INTERLOCK
– RESET
– KEYED INTERLOCK
– ALARM INDICATOR
INSTRUMENT SYMBOLS
– DISCRETE INSTRUMENTS FIELD MOUNTED
– DISCRETE INSTRUMENTS PRIMARY LOCATION (CONTROL ROOM) FRONT PANEL MOUNTED
– DISCRETE INSTRUMENTS PRIMARY LOCATION (CONTROL ROOM) REAR PANEL MOUNTED
– DISCRETE INSTRUMENTS AUXILIARY LOCATION (NORMALLY ACCESSIBLE) FRONT PANEL MOUNTED
– DISCRETE INSTRUMENTS AUXILIARY LOCATION (NORMALLY ACCESSIBLE) REAL PANEL MOUNTED
– DCS FUNCTION DATA ACCESSIBLE TO OPERATOR
– PLC FUNCTION AUXILIARY LOCATION DATA NOT ACCESSIBLE TO OPERATOR
– PLC FUNCTION PRIMARY LOCATION DATA NOT ACCESSIBLE TO OPERATOR
– OTHER COMPUTER FUNCTION
– DISCRETE INSTRUMENTS FIELD MOUNTED NO LOOP IDENTIFIER
– AI = ANALOG INPUT ,AO = ANALOG OUTPUT DI = DIGITAL INPUT ,DO = DIGITAL OUTPUT
– AI = ANALOG INPUT ,AO = ANALOG OUTPUT DI = DIGITAL INPUT ,DO = DIGITAL OUTPUT
– AI = ANALOG INPUT ,AO = ANALOG OUTPUT DI = DIGITAL INPUT ,DO = DIGITAL OUTPUT
– AI = ANALOG INPUT ,AO = ANALOG OUTPUT ,DI = DIGITAL INPUT ,DO = DIGITAL OUTPUT ,SI = SERIAL INPUT ,SO = SERIAL OUTPUT
GATE SYMBOLS
– SLUICE GATE
– WEIR GATE
– FLAP GATE
– SLIDE GATE (NO)
– STOP LOG (NO)
– STOP LOG (NC)
– SLIDE GATE (NC)
| Language | English |
| Drawing Type | Block |
| Category | Industrial |
| Additional Screenshots | |
| File Type | dwg, Image file |
| Materials | Other |
| Measurement Units | N/A |
| Footprint Area | |
| Building Features | |
| Tags |