Installationand Operation Manual
ARV 2000
Section 3: Operation, Maintenance & Troubleshooting
12755 Rev 04 Page 1of 3
3.1 Operation
Introduction
The ARV 2000 is a single stage regulator designed to control and maintain a constant pressure for
process exhaust by compensating for fluctuating exhaust conditions. It has been designed to operate
with minimal operator involvement.
Operational Theory
The ARV Auto Resistor Valve contains two sets of vanes that have been designed to align with one
another. The solid area of the input vane matches the solid area of the output vane and slightly overlaps
the open area of the output vane. If the vanes are aligned so that the solid area of the input vane
completely closes off the open area of the output vane, the valve will be in a closed position, with
minimal1airflow through it. As the input vane rotates with respect to the output vane, the combined open
area will increase linearly with the amount of rotation, maintaining concentricity about the center of the
air flow path. When the solid area of the two vanes is aligned, the valve is at its fully open position,
allowing maximum flow.
The unique geometric configuration of the ARV vanes provides an aerodynamic path for the
exhaust gas, resulting in negligible resistance across the valve in the fully open position.
A stepper motor controls the rotation of the input vane. A 0-2" (498.2 Pascal) pressure transducer inside
the valve measures the resulting pressure at the inlet of the ARV 2000.
To control pressure using the ARV 2000 requires the TIM-100 FSP. The user interfaces with the TIM-
100 FSP directly or through the tool controller to enter set points and other critical information. With
feedback from the transducer, the TIM-100 FSP commands the stepper motor through unique adaptive
fast set point software.
TIM-100 FSP Fast Set Point Control
The TIM-100 FSP includes a fast step software, which shortens the time it takes the valve to reach any
known set point. The TIM-100 FSP maintains a table for up to four operator programmable set points.
Whenever the ARV 2000 achieves one of those set points, the TIM stores the stepper motor position in
the table. After setup (see the TIM-100 FSP Manual for more information about the setup) each time the
process requires that set point, the TIM commands the ARV directly to that stepper motor position,
achieving the set point almost immediately. Once at that motor position, a standard PID loop is activated
to fine tune the system and maintain set point. Any adjustments made to the stepper motor position are
updated to the table. By updating these set point records in the table, the ARV 2000 system can be
considered an adaptive controller. The ARV 2000 will adapt to changes in the process exhaust line, and
to changes in the facility exhaust pressure while maintaining fast transitions from one set point to the
next.
Auxiliary Sense Ports
The ARV 2000 has two pressure test ports, one each on the inlet and outlet of the valve. The ARV 2000
is shipped with these ports plugged with screws. To use them, remove the screw, insert a barbed fitting
into the hole, and run 1/8" ID tubing from the fitting to an auxiliary transducer.
1For typical ARV applications, the flow is essentially zero through the closed vanes.
