Mar. 06, 2021
Globe Control Valve
The globe control valve was developed and put into use more than a century ago. Not only are they original, but they are the only type of control valve available for a long time. However, in the past 20 to 50 years, there have been some substantial advances in the field of control valves. These advancements have led to the design of more modern rotary control valves, which have many advantages over their global control valve ancestors.
This is not to say that the globe valve is completely obsolete. They still have a place in the process industry. Most notably, when the pressure drop through the valve during the process is very high, the globe control valve is still the most suitable. However, due to the higher price tag (and other shortcomings), whether a globe control valve is needed for a particular application, of course, should have a lot of consideration. In addition, a cheaper rotary valve may be a more suitable solution.
In some applications, the globe valve definitely has an advantage over the rotary valve. For example, globe valves have interchangeable trims, which provide two potential advantages. First of all, interior parts of different sizes can be allowed to build processes for initially smaller capacities, and then as capacity requirements increase, they can be replaced with larger interior parts. Or, if there is an error in the initial design process, a different flow diameter can be installed to correct the error without having to replace the entire valve. The second benefit is to allow the operator to choose between equal percentages or linear inherent characteristics. This linear trim option has advantages in high-pressure drop applications.
However, most control valve applications require the same percentage of characteristics, which happens to be an inherent characteristic of most rotary valves. This fact makes them generally the most suitable choice for most control applications.
Compared with most rotary valves, one advantage of the globe valve is its high recovery rate, which helps prevent cavitation from occurring. For this reason, some people in the process industry are reluctant to choose cheaper rotary valves but stick to the traditional globe control valve design. Through computational fluid dynamics, engineers can analyze the circuit to verify that the rotary valve is working, or get a warning that a globe valve or a specially modified rotary valve is actually required.
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