The flowmeters and MVR valves are available in various
sizes for various materials and flow rates. Users should
consult our technical support group to determine which are
required for their specific application.
The MVR Valves act as both flow control valves and on-off
valves depending on the application. With manual mode
guns, the master channel MVR opens 100% during operation
and the slave channel or channels are controlled to maintain
the proper ratio only. With guns configured in automatic
mode, all MVR valves act as flow control valves. There
are 3 different needle sizes available for the MVR valves
(02 for low flow, 03 for medium flow, and 04 for high flow).
The flowmeters act as the feedback mechanism to the soft-
ware so that it knows the current flow rate of the material.
The RansFlow is capable of interfacing with any type of
positive displacement flowmeter that is capable of outputting
a square wave whose frequency is proportional to the flow
rate. It is highly recommended (although not absolutely
necessary) that these flowmeters have quadrature outputs
so that reverse flow can be detected.
Fluid Panel Components - MVR Valve
• Three “needle” sizes available
Size #2: Low Flow, 15 - 350 ml/min
Size #3: Moderate Flow, 250 - 2600 ml/min
Size #4: High Flow, 1000 - 3500 ml/min
Weeping MVR Needles
Weepless MVR Needles
ADDENDUM E:
The calibration valves are 3-way ball valves used to direct
the flow of material away from the mix block to the calibration
tubes. This is used to calibrate the flowmeters.
The check valves prevent backflow of material from one
source to another. (Typically, the catalyst is run at a higher
pressure than the resin to allow it to ‘inject’ itself into the
resin flow stream and can, therefore, back up into the resin
supply if an MVR valve is stuck open for any reason.)
The Mix-Block is a four-port manifold that brings the fluid
from the outlet of the resin MVR together with the outlet of
the catalyst MVR. Attached to the top of the Mix-Block is
a port for an optional solvent flush valve for quick flushing
of only the mixed material from the Mix-Block out to the
applicator.
Attached to the outlet of the Mix-Block is the spiral mix tube.
This is simply a piece of tubing with a helical-shaped element
inside the tube. This element causes the two materials
(resin and catalyst) to be ‘folded’ together numerous times
as the materials pass through it, thus causing it to mix.
#2
#3
#4
LN-9400-00-R11 (08/2018)
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APPENDIX