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Pinch Valves - Design Principles

From Neptune Research, Inc.
 

 
The principle of the pinch valve is extremely simple and adaptable. It works on the same principle as when you pinch the garden hose between your fingers to stop the flow. It is not possible to give a much simpler explanation that the above, however, there are a number of points about pinch valves in operation that must be understood to avoid potential problems. First we have to have a look back at section 2.1, where on page 2 it is state under disadvantages that the NR solenoids only have a short stroke. This is also a disadvantage with pinch valves, as it is necessary to have a stroke equivalent to at least the bore of the tube you are using for it to work from fully open to fully closed. If the required stroke is not available, it is necessary to save stroke on the open state. A diagram is given to illustrate this point.
Product Announcements
Neptune Research, Inc. - Flow-Rite® Flow Control Pinch Valves
These Flow Control Pinch Valves are versatile and make it simple to add precision needle valve functions to nearly any laboratory, commercial or industrial device or system where fluid is handled in... (read more)
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The "Fitting type" SURELOK features a one-piece 11" throat, steel "C" frame bolted to a solid steel lower arm. This machine is specifically designed to fasten two ply of material together, as used in... (read more)
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Valcor Engineering Corporation - Pinch Valves
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AGI line of pneumatic components designed for high-throughput automation for the world market. The new products that include: smaller thruster, feed escapement, single finger feed escapements, three... (read more)
Acro Associates, Inc. - Model 932 Pneumatic Pinch Valves
Acro Associates' pneumatic pinch valves are designed to work with flexible tubing, where easy replacement of the entire fluid path is required. These valves are robustly designed making them suitable... (read more)
 
Topics of Interest
3.7.1 Introduction to Manual Pinch Valves A pinch valve is any valve with a flexible elastomer body that can be pushed together—or “pinched”—through a mechanism or through... (Read More)
Two designs are prevalent in pinch valves: the open body and enclosed body. The open-body pinch valve has no metal body casing and relies upon a skeletal metal structure. This skeletal structure... (Read More)
3.8.1 Introduction to Manual Diaphragm Valves Related to the pinch valve, the diaphragm valve uses an elastomeric diaphragm instead of a liner in the body to separate the flow stream from the... (Read More)
PINCH VALVES Pinch valves are flex-body valves consisting of a flexible tube that is pinched either mechanically, as in the valves shown in Figure 3-88 through Figure 3-90, or by the application of... (Read More)
Generally, pinch-valve operation is quite simple. Turning the hand- wheel lowers the compressor and moves the upper wall of the liner toward the static lower wall, which is supported by the bottom... (Read More)