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Proportional Valves Eliminate Design Headaches

From Clippard Instrument Laboratory, Inc.
 

 
Proportional valves are a great alternative when an application requires more than on-off control, but not the high precision and expense of servo valves. As such, proportional valves are widely used in a multitude of applications, including the control of gas and air flow from medical respirators, dialysis machines, and paint-delivery and semiconductor-manufacturing systems. The beauty of the valves is the ease with which they can vary the rate of flow, with output proportional to input current. However, most such valves have several major characteristics that can make precise control difficult, including hysteresis and variable maximum flow and gain.
Products & Services
Water valves are designed to handle and control hot water, cold water, ground water, potable water, salt water and/or wastewater. They are made from metal or plastic. Search by Specification | Learn more about Water Valves
Filter, regulator, lubricator (FRL) assemblies are pre-packaged or modular assemblies of common configurations of air filters, regulators, lubricators, and gauges. Search by Specification | Learn more about Filter, Regulator, Lubricator (FRL) Assemblies
Hydraulic valves contain and transfer the flow and pressure of hydraulic fluid in hydraulic power systems. They range from simple shutoff valves to precision control valves. Search by Specification | Learn more about Hydraulic Valves
Gas valves are used to handle and control the flow of gaseous media such as liquefied petroleum and natural gas. They are made of metal or plastic and vary in terms of valve size, pressure rating, number of ports, and flow. Search by Specification | Learn more about Gas Valves
Air valves allow metered fluid flow in one or both directions. They are used in pneumatic circuits to regulate the rate of activation or exhaust of cylinders and other pneumatic devices. Search by Specification | Learn more about Air Valves
Product Announcements
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Proportion-Air, Inc. - QPV1 Electro-pneumatic Proportional Control Valve
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Proportion-Air, Inc. - DQPV1 Electro-pneumatic Proportional Control
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ControlAir Inc. - Compact Pressure Regulator Now ATEX Compliant
Type-550X Miniature Electropneumatic I/P, E/P Transducer with ATEX compliance. The Type-550X with 4-20mA signal, approved by Factory Mutual (FM) and the Canadian Standards Association (CSA) as... (read more)
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Topics of Interest
Proportional pneumatic valves can have hysteresis levels as high as 15%, which can wreak havoc on closed-loop control systems. Another problem with proportional valves is that they often vary from one... (Read More)
In this section we illustrate how complex control systems can be built from simple components by using the paradigms we have discussed. The problem is quite complex. It involves selection of measured... (Read More)
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Innovation sometimes makes it possible to have your cake and eat it too. Solenoid valves are inexpensive devices that provide on-off flow control with its concomitant wide error band. When accurate... (Read More)
The paper presents a new generation of proportional and servo valves with integrated digital electronics. The micro controller allows with its free programmable signal processing options a significant... (Read More)
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