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Advantages
of
Using Pinch Valves for
Modulating Control
— General
High
CV values = one of the best performers in terms of cost vs.
fluid capacity
Inherent
unobstructed linear flow, as compared to the turbulent flow which is
characteristic of others ball, plug, butterfly, and diaphragm valves
Self-cleaning, flexing action of the elastomer tube loosens
deposits, minimizing problems associated with stiction, overshoot, and
other control valve irregularities
Generally, smaller valve sizes required
A simple tube change to a different elastomer or different
size (full port to reduced port) provides the ability to meet changing
flow requirements without having to change the valve
Reduced port elastomer tube resists cavitation due to the
pressure drop being absorbed in two stages and there being more wear rubber to resist
abrasion
Light cavitation is less damaging to elastomer because the
elastomer is more absorbing (the small explosions “bounce” off the
elastomer)
The elastomer tube is the only part in contact with the
process stream
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Advantages
Unique to the RF Valve®
Standard
B-16 face-to-face dimension provides interchangeability with most high
performance designs (i.e. ball, globe, plug, etc.)
Patented
non-stretch elastomer tube provides longer life, as the tube is not
stressed during the throttling operation
Patented SMART ValveTM Wear Monitoring sensor
wire alerts maintenance when it is time to change the elastomer tube
Zero-leakage shut-off
Ability to change elastomer tube in-line
Sizing flexibility up to 2 sizes
The folds in the elastomer tube provide for a stiffer tube
that allows throttling even under vacuum conditions
Particularly suited for accurate control of scaling,
abrasive, corrosive and plugging slurries, liquids, or powders
Advantages
Unique to aiRFlex®
Eliminates need for actuator
—
plant air only
No moving parts
Half the cost of most other control valve designs
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