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Rotary Valve Bodies

There are various styles of control valve bodies which have been developed through the years. Some have been used in a variety of applications to meet specific service conditions, while some are used less frequently. But whether they have wide applications or not, they all have their own features and specific functions.

In addition to various types of globe valves, there are also many different categories of rotary valves. Butterfly valve bodies are the first and the most important kind. Butterfly valve bodies offer economy, particularly in larger sizes and in terms of flow capacity per investment. They can provide high capacity with low pressure loss through the valves. They might require high-output or large actuators if the valve is big or the pressure drop is high, because operating torques might be quite large. van điều khiển khí nén

Standard butterfly valves are available in sizes through 72-inch for miscellaneous control valve applications. Smaller sizes can use versions of traditional diaphragm or piston pneumatic actuators, including the modern rotary actuator styles. Larger sizes might require high-output electric or long-stroke pneumatic cylinder actuators. Butterfly valves exhibit an approximately equal percentage flow characteristic. They can be used for throttling service or for on-off control. Soft-seat construction can be obtained by using a liner or by including an adjustable soft ring in the body or on the face of the disk.

The second are the V-notch ball control valve bodies. The V-notch produces an equal-percentage flow characteristic. These control valves have good range ability, control, and shutoff capability. This kind of valve bodies is mainly used in the paper industry, chemical plants, sewage treatment plants, the power industry, and petroleum refineries use, etc. they are suited to control of erosive or viscous fluids, paper stock, or other slurries containing entrained solids or fibers.

Eccentric-disk control valve bodies are also popular. They use standard pneumatic diaphragm or piston rotary actuators. Eccentric disk rotary shaft control valves are intended for general service applications not requiring precision throttling control. They are frequently applied in applications requiring large sizes and high temperatures due to their lower cost relative to other styles of control valves. The control range for this style of valve is approximately one third as large as a ball or globe style valves. Consequently, additional care is required in sizing and applying this style of valve to eliminate control problems associated with process load changes.

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