Selecting the correct chemical metering pump can be a daunting task because of the variations and types of chemical pumps available. In order to pick the best metering pump for the application you will need to consider several factors. For the sake of simplicity, we will limit our discussion to pumps that deliver no more than 50 gph and pressures of less than 250 psi.

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There are two strategies for reducing control valve noise:

1. Source control, that is doing something to the valve to make it less noisy, and

2. Path control, that is doing something to prevent the noise from reaching the people who would be bothered by it.

I was recently asked how the pressure at the vena contracta of a control valve in a liquid application can be determined. I am sharing my answer below.

Perhaps the most misunderstood area of control valve sizing is the selection of the pressure drop, p, to use in the sizing calculation

We will briefly discuss what causes aerodynamic noise and some of the things that can be done to reduce aerodynamic noise generated by control valves.

Answer a number of key questions to identify the most appropriate choice

At process plants, a significant percentage of measurement devices aren't correctly matched to their application, leading to decreased quality and consistency of the operation. Often, the source of this problem is the assumption that one type of level measurement sensor suits multiple applications.

For most systems, in order to get good control with stability throughout the full range of required flow rates, we need to use a control valve that has an installed flow characteristic that is linear, or at least as close to linear as possible.