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Choosing the Right Proportional Valve
Proportional valves are suited to a wide variety of applications in machinery, basic processes and simple or complex, hydro-pneumatic systems. They provide a cost effective and compact solution for controlling flow or pressure at relatively low flow rates. There are many different designs and styles of proportional valves for varying operating pressures and flow rates, with either electric or electro-pneumatic actuation.
Process control is a specialist field and like many other specialisms it has developed a ‘language’ of its own that is alien to many outsiders. These outsiders may include engineers who have the responsibility to specify valves to control pressure or flow within machines they are designing, or in simple processes they have developed. A basic understanding of control terminology is essential if an engineer is to select the correct valve for an application.
Automation and control solu- tions provider Festo has launched a new propor- tional valve, the VPPM, onto the South African market.
The company states that proportional valves are clever regulators for various pneumatic applications, since they regulate actuator movement at different speed and power levels. The new VPPM proportional valve from Festo, however, satisfies all requirements. Users can now individually select different proportional valves from a modular system to suit their applications.
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Proportional valves enable different regulating characteristics to be set. This is often necessary in handling and assembly technology or in the furniture industry, where machine cycle times with lower drive speeds must be applied.
Proportional valves are also used by automotive parts suppliers and in manufacturing technology, conveyor systems or test engineering for travel according to individual acceleration ramps in cases where pneumatic drives must approach delicate goods gently.
The variable flow rates of the proportional valves adapt the cylinder speeds to the manufacturing process. The valves regulate the contact force during polishing or spin welding and the internal pressure for the extrusion of tubing. They also regulate the torque in the case of pneumatic impact wrenches.
Festo says that the new VPPM proportional valve is useful for astute designers. Design engineers can save space, as well as money, as they can move a cylinder with one valve and regulate the force by means of pressure regulation.
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