310531
7
PrecisionFlo Module Overview
Fluid Metering Assembly
The fluid metering assembly (Fig. 2) can be attached
to a robot’s arm, or mounted on a pedestal. Main
components of the fluid metering assembly are:
PrecisionFlo metering valve (A)
flow meter to precisely measure the amount of fluid
dispensed (B)
solenoid air valve that controls a dispense de-
vice (C)
metering valve closer (D)
solenoid air valve (E) that controls the metering
valve’s closer
Fig. 2
8781A
B
C
E
A
D
The PrecisionFlo Metering Valve
The PrecisionFlo metering valve (A) is the core of the
PrecisionFlo module. The PrecisionFlo metering valve
is a precision fluid pressure regulator that uses a linear
servo motor to achieve fast response to electronic
commands while providing a precisely controlled, con-
tinuous flow of material.
PrecisionFlo Module Capabilities
The PrecisionFlo module combines continuous pres-
sure control with the ability to change bead profiles
almost instantaneously. The PrecisionFlo module au-
tomatically adjusts for fluctuations in the operating en-
vironment, such as sealant viscosity, temperature, and
robot speed, while maintaining the desired dispense
rate.
The PrecisionFlo metering valve is electrically con-
trolled by the PrecisionFlo module, and consistent ma-
terial flow is assured by a closed-loop pressure control
design. The module responds to robot-supplied sig-
nals to provide an accurate and consistent output flow
based on a comparison of actual with desired flow
rates. Fluid temperature conditioning is also available
as an option.
Typical Fluid Applications
PVC Sealer
Plastisols
Low Viscosity Mastics
Adhesives
Silicone Materials
PrecisionFlo Features
Sophisticated Electrical Design: Provides ex-
tremely fast and accurate response times.
Simple User Interface: A control pendant pro-
vides easy, menu-driven control to the operator.
Designed for Robotic Applications: Micropro-
cessor-based control electronics communicate
faults, warnings, status, and operating data quickly
and easily to external robotic systems via digital
interfaces.
Module Monitors Motor Temperatures: The
PrecisionFlo module monitors metering valve motor
temperature for enhanced diagnostics and motor
protection.
User Obtainable SPC Data: The PrecisionFlo
module supplies SPC data to the operator via the
control pendant, or to an external system on com-
mand.
Carbide Needle and Seat: Filled and abrasive
materials can be dispensed.
Solenoid Closer: Provides positive closing of the
dispense valve.
Real Time Volume Compensation provides:
–
10% continuous volume compensation (not
on the total batch job).
–
Capability to handle body style and batch size
changes quickly.
–
Ability to handle shear-thinning materials.
–
Ability to deliver steady flow rate during viscos-
ity changes.
