Section 2 - Description And Operation; Introduction; Operation Diagram; Block Diagram - ABB AV1 Operating Instructions Manual

SECTION 2 - DESCRIPTION AND OPERATION

INTRODUCTION

+
SET
CONTROLLER
POINT
–
POSITION
TRANSMITTER
(OPTIONAL)
This section describes and explains the functional and physical
operation of Type AV1 and AV2 positioners. Figure
the operating principles of the positioners. Figure
placement of a positioner in a typical control system.
PILOT VALVE
TO ACTUATOR
O1
SUPPLY PRESSURE
S
TO ACTUATOR
O2
Figure 2-1. Operation Diagram
+
POSITIONER
–
LINKAGE
PROCESS FEEDBACK
Figure 2-2. Block Diagram
DIAPHRAGM
FORCE
SIGNAL
DIAPHRAGM

CAM

RANGE
SPRING
LOAD
+
ACTUATOR PROCESS
–
2-1 diagrams
2-2 shows the
BALANCE
BEAM
GAIN
HINGE
SPRING
RANGE
INPUT
SPRING
SIGNAL
FORCE
PRESSURE
T00354A
OUTPUT
T00770A
INTRODUCTION
2 - 1