A Teledyne Halco portable fluxer unit
with a Vanton close-coupled,
self-priming Flex-i-liner® pump.
Close-up view showing compact
Flex-i-liner® positioned in fluxer
Block and Liners of varying material.
Flex-i-liner® pumps are available in a
variety of engineered rigid plastics and
elastomers enabling them to safely
handle just about every corrosive or
hazardous fluid over the full pH range.
The most common materials are shown
here. (Top row, left to right);
Polyethylene body, Viton liner;
reinforced Teflon body, Hypalon liner;
Polypropylene body, Natural Rubber
liner; (Bottom row) Polypropylene body,
Buna-N liner; Carbon- Filled Teflon
body, Neoprene liner; Teflon body,
Pumping Solder Flux
Hydrochloric acid, Solder flux
FLEX-I-LINER Sealless Self-Priming Peristaltic Pumps
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Reprinted from PUMPS AND SYSTEMS MAGAZINE
Unique plastic pump distributes solder flux onto
printed circuit boards
Pumping solder flux that contains 5% hydrochloric acid is a troublesome
service. A unique plastic pump that uniformly distributes the flux onto
printed circuit boards (PCBs) is critical to the performance of the
horizontal solder leveling system developed by Teledyne Halco.
Specifications call for uniform coating and metering of the aqueous flux
as the PCBs move by on a conveyor at 30 feet/min. The pump, which
operates continuously during eight-hour shifts, is designed so that only
two non-metallic parts are in contact with the ethylene-glycol based
The Unicote® Horizontal Solder Leveling System is said to deliver the
tighter hole tolerances, surface thickness, and uniformity of application
that today's surface mount technology demands. On identical SMD pad
configurations with solder thickness of 200 to 300 millionths of an inch
at the crest, deviations of 50 to 60 millionths of an inch are typically
achieved on 50 pitch and smaller.
The solder fluxer is a mobile, compact roller coating unit designed to
apply flux formulations as specified. It is constructed as a
polypropylene box frame with compartments for the pump and supply
tank, both of which can be readily accessed.
The fluxer has three sets of conveyor rolls. The first and third sets run
dry and are intended only for conveyance. The second set, constantly
flooded by fluxing liquid, serves as the applicator in addition to
providing conveyance. The rollers are designed with an inner core to
provide rigidity and dimensional stability. Their outer surface is bonded
to a thin-walled plastic tube. The entire roller coating assembly rests in
a compartment at the top of the fluxer. The compartment serves as a
drain conduit, returning excess flux to the supply tank below. A
platform is provided directly under the chamber for the flux circulation
pump, which must be self-priming and draw the flux from the supply
tank for continuous, uniform distribution through manifolds to the
The pump selected for this operation is a close-coupled Vanton
Flex-i-liner® self-priming polypropylene pump with a flexible neoprene
liner. It has no stuffing box, glands, shaft seals, check valves, or gaskets
and it is completely sealless. The plastic components are totally
resistant to the flux, and the design is ideal for handling viscous
materials. Fluid flow is confined to a channel formed by the outer
surface of the flexible body block or pump casing. All mechanical
action and moving parts are within the liner and are not exposed to the
corrosive fluid. Movement of the fluid is controlled by a rotor mounted
on an eccentric shaft that oscillates within the liner, creating a
progressive "squeegee" action on the trapped fluid. The liner and pump
casing are the only parts in contact with the pumped fluid, eliminating
any danger of contamination. The model selected for this service is a
size 12, which has a capacity of two gallons per minute. It is driven by a
¼ Hp, totally enclosed electric motor operating at 1,450 rpm at 50
cycles (1,750 rpm at 60 cycles).
In addition to dependable, uniform operation, a significant feature of this
pump is the ease with which it can be maintained and serviced. The
only wearing part is the low-cost liner, which can be replaced in a
matter of minutes without special tools. In addition, the pump can be
run dry for extended periods without harm.
Teledyne Halco's Horizontal Solder Leveling Systems are recommended
where high production rates are required on relatively thick boards
(typically 0.062 in.), 18 in. x 24 in. Dwell time of the entire board as it
passes through the 6 in. chamber is less than two seconds.
Exploded view of Vanton pedestal mounted
Flex-i-liner® pump showing basic
simplicity of construction. No seals.
No packing. No valves. No gaskets.
Only two chemically inert parts — the
flexible liner and body block — are in
contact with the fluid.
In the 1950, Vanton developed a revolutionary all-plastic pump for use in conjunction with the first heart-lung device. The design limited fluid contact to only two non-metallic parts: a plastic body block and a flexible liner. This was the birth of our Flex-I-Liner rotary pump. Its self-priming sealless design made it an industry standard for the handling of corrosive, abrasive and viscous fluids as well as those that must be transferred without contaminating the product. Vanton now offers the most comprehensive line of thermoplastic pumps in the industry.
Stay in touch
(+44) 01260 277040
Vanton Pumps (Europe) Ltd.
Unit 4, Royle Park
Congleton CW12 1JJ