Need to find control valve for damper

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Far too often, equal percentage control valves are found in applications where linear control valves should have been used. This article explains equal percentage control valves and sets guidelines for their use.

What is an Equal Percentage Control Valve?

The relationship between valve stem position and the flow rate through a control valve is described by a curve called the valve’s flow characteristic curve, or simply the valve characteristic. An equal percentage flow characteristic is a nonlinear curve of which the slope increases as the valve opens, while a linear flow characteristic is a straight line (Figure 1).

Figure 1. Equal percentage and linear flow characteristics.

Control valves manipulate the rate of liquid/gas flow through them by altering the open area through which the liquid/gas passes. Linear valves increase the open area linearly with valve travel, while equal percentage valves open progressively more area with valve travel (Figure...

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We live in a consumer-driven economy. Very few people purchase even a box of breakfast cereal without doing plenty of online research and pricing comparisons. Before you invest in anything for your home, you want to make sure the product is safe, fulfills your needs and, perhaps most importantly of all, you want to make sure you’re getting a good value. Choosing control valves is really no different. At the end of the day, you want to ensure you’re selecting a product that is high quality, economical and will get the job done for many years to come.

The best place to start is by considering the most pertinent detail of any valve: the size.

Choose the Correct Size for the Pipe

The goal for any process control engineer is to find the smallest valve necessarily for the purpose. Often, the smallest valve is also the least expensive. However, it’s imperative that you know exactly the size needed for the pipe. Choosing the wrong size can lead to...

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