Welcome

Instrumentation, operations and maintenance engineers are very familiar with the challenges control valves face with abrasive, scaling, corrosive and plugging-prone slurries, sludge and liquids. Quality instrumentation from reliable suppliers is the backbone of an integrated control system, but when valves are constantly wearing, seizing or plugging, a closer look at valve sizing and design may be required to work out system bugs.

Among new developments in control technology are new trim designs and elastomer formulations that improve performance and reduce downtime under difficult service conditions. In the forefront are new pinch-valve designs that meet process and industry requirements for interchangeability and higher reliability in severe services.

Available in standard ASME/ANSI B16.1, DIN, and ISO face-to-face dimensions, pinch valves offer adjustable trims (up to two line sizes) and in-line maintenance without recalibration at lower cost than ceramic valves and most metal seated or lined ball, plug, diaphragm, and butterfly designs.

Advantages of Using Pinch Valves for Modulating Control

High C_V values = generally smaller valves = more cost-effective in terms of cost vs. fluid capacity
Inherent unobstructed linear flow, as compared to more turbulent flow characteristic of other valve designs
Self-cleaning, flexing action of the elastomer tube loosens deposits, minimizing problems associated with stiction, overshoot, and other control valve irregularities
Zero-leakage shut-off
A simple tube change to a different elastomer or a different size (full port to reduced port) provides the ability to meet changing flow requirements without having to change the valve itself
Reduced port elastomer tube resists cavitation as pressure drop is absorbed in two stages with 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, replaceable in-line without recalibrating pinch mechanism or positioner, thereby reducing downtime and loss of production

Recommended Applications

Areas or applications where:

Scaling causes valves to seize

Abrasion or corrosion results in high maintenance and leakage

Turbulent flow causes valve or pipe wear

Fibers or other materials have a tendency to plug

Operating
Conditions

0.5" — 40" inside diameter

Line pressures 15, 90,
150 psig

Temperatures to < 210^oF

Control signal 3-15 psi or 4-20mA

Pneumatic, electric, hydraulic, and manual actuators



	Learn more about the reliability and operating benefits of RF Valves by visiting our Website at www.rfvalve.com
Then compare RF VALVE^® and aiRFlex^® technology against any other ASME B-16.10, ANSI #150 flange ball valves in abrasive, scaling, corrosive or plugging sludge, slurry, or liquid services.

	This site has been built specifically for users and specifiers seeking alternative solutions to common control-valve problems in industrial and municipal services.