LINE DESIGATIONS
CONNECTION TO PROCESS, MECHANICAL LINE OR INSTRUMENT INPUT
CAPILLARY TUBING (FILLED SYSTEM)
PNEUMATIC SIGNAL
ELECTRICAL SIGNAL OR
SOFTWARE SIGNAL
HYDRAULIC (LIQOID) SIGNAL
ELECTROMAGNETIC OR SONIC SIGNAL
(INCLUDING RADIO WAVES, NUCLEAR RADIATION,HEAT AND LIGHT)
INSTRUMENT AIR SUPPLY
INSTRUMENT LINE PURGE **-PURGE MEDIUM
(LINE SERVICE IDENTIFICATION OR AS NOTED)
TEMPERATURE INSTRUMENTS
SINGLE THERMOCOUPLE, RTD,
GAUGE OR WELL,
*** - RTD (IF RESISTANCE
TEMPERATURE DETECTOR)
DUPLEX THERMOCOUPLE IN ONE WELL
MULTI-ELEMENT THERMOCOUPLE FOR DIFFERENT ELEVATIONS OR ZONES
16
(INDICATE FIRST AND LAST TAG
NUMBERS OR TAG NUMBER SUFFIXES)
TEMPERATURE REGULATOR 温度调节阀
PRESSURE INSTRUMENTS 压力调节器
CONTROLLING SIDE
PRESSURE REDUCING REGULATOR-SELF-CONTAINED
PRESSURE REGULATOR WITH EXTERNAL PRESSURE TAP
DEFFERENTIAL PRESSURE REDUCING WITH EXTERNAL AND PRESSURE TAPS
SAFETY RELIEF VALVE
PRESSURE AND VACUUM SAFETY
RELIEF VALVE
PILOT OPERATED SAFETY RELIEF VALVE
RELIEVING MANHOLE COVER
PRESSURE OR VACUUM RELIEF
SET PRESS 设定压力
PRESSURE RELIEF RUPTURE DISK
VACUUM RELIEF RUPTURE DISK
FLOW INSTRUMENTS 流量计
EXTERNAL 17
ORIFICE PLATE OR RESTRICTION ORIFICE 孔板或限流孔
ORIFICE PLATE IN QUICK CHANGE FITTING
VENTURL FLOW TUBE OR FLOW NOZZLE 文丘里流量计或喷嘴
INSERTION TYPE FLOW INSTRUMENT 插入型流量计 FLUME
WEIR
ROATMETER 转子流量计
FLOW STRAIGHTENING VANES
EXTERNAL TYPE FLOW INSTRUMENT SPECIFY TYPE
OUTSIDE BUBBLE
IN-LINE FLOW INSTRUMENT
SPECIFY TYPE
OUTSIDE BUBBLE
LEVEL INSTRUMENTS 液位计
EXTERNAL LEVEL INSTRUMENT 外部液位计（玻璃板、浮筒式）
INTERNAL FLOAT TYPE LEVEL INSTRUMENT 浮筒式液位计
BUBBLE TYPE LEVEL INSTRUMENT
RADIATION OR SONIC LEVEL INSTRUMENT
FLOAT AND TAPE TYPE LEVEL INDICATOR OR TRANSMITTER STORAGE TANKS
OTHER LEVEL INSTRUMENTS SPECIFY TYPE OUTSIDE BUBBLE
FOR 18
LEVEL REGULATOR WITH MECHANICAL LINKAGE
CONTROL VALVES
GLOBE VALVE 球阀 ANGLE 角阀
BUTTERFLY 蝶型
BALL. PLUG OR DISC 球、塞子、圆盘
DIAPHRAGM（SAUNDERS） 隔膜
OTHER （SPECIFY NEXT TO SYMBOL） 其他的（在下一个符号中详细说明） THREE WAY GLOBE 三通球型调节阀
FOUR WAY VALVE 四通调节阀
ACTUATORS
SPRING AND DIAPHRAGM 弹簧和隔膜
DIFFERENTIAL DIAPHRAGM 微分隔膜
PISTON TYPE - SINGLE ACTING
PISTON TYPE - DOUBLE ACTING
ELECTRIC MOTOR 电动马达 SOLENOID 螺线管
ELECTRO-HYDRAULIC
GAS MOTOR 气动马达
MANUAL HANDWHEEL 手轮
19
ACCESSORIES
SIDE MOUNTED HANDWHEEL
MANUAL RESET
REMOTE RESET
ADDITIONAL INFORMATION
BODY SIDE 阀体尺寸
BTS BUBBLE TIGHT SHUT-OFF
TSO TIGHT SHUT-OFF
AIR FAILURE POSITION
FO FAIL OPEN 故障时打开 FC FAIL CLOSE 故障时关闭
FL(O) FAIL LOCKED(LAST POSITION) VALVE OPENS ON DECREASING CONTROL SIGNAL
FL(C)) FAIL LOCKED(LAST POSITION) VALVE CLOSES ON DECREASING CONTROL SIGNAL
SPLIT RANGE DESIGNATION
A FIRST VALVE TO RESPOND TO INCREASING CONTROL SIGNAL
B SECOND VALVE TO RESPOND TO INCREASING CONTROL SIGNAL
MISCELLANEOUS ITEMS 各种
INLINE INSTRUMENTS
20
PID图例符号介绍要点
