Processing, December 2020

With computational uid dynamics engineers can analyze the loop to verify that the rotary valve will work or be warned that a globe valve or a rotary valve with special modi cations is in fact required More than a Check Valve ITS A CHECK ALL www checkall com DECEMBER 2020 www processingmagazine com 19 Inherent and installed characteristics ere are certainly advantages that globe valves have over rotary valves in certain applications For example a globe valve has interchangeable trim which o ers two potential bene ts First di erent size trims can allow a process to be built for an initially smaller capacity and then replaced with larger trim as capacity needs increase Or if a mistake was made during the original design a different trim size can be installed to correct the mistake without having to replace the entire valve e second bene t is to allow an operator to choose between an equal percent or a linear inherent characteristic This linear trim option can be an advantage for high pressure drop applications However the vast majority of control valve applications require an equal percent characteristic which happens to be the inherent characteristic of most rotary valves is fact makes them often the most appropriate choice for the bulk of control applications Computational uid dynamics Computation uid dynamics allows engineers to predict cavitation and noise generation in a valve Anyone who has experience working with valves of any kind understands the negative effects that cavitation can have in a process If left unaddressed cavitation or high noise levels can lead to equipment failure and in some cases a complete shutdown of an operation With computational uid dynamics engineers are equipped to analyze a valve for a speci c application before it is built is allows the owner to be con dent that selecting a lower cost rotary valve will not compromise the performance or safety of their process One advantage that globe valves have over most of their rotary valve counterparts is their high recovery factor which helps to prevent cavitation from occurring For this reason some in the process industry are hesitant to go with the less expensive rotary option and instead stick with the traditional globe valve design With computational uid dynamics engineers can analyze the loop to verify that the rotary valve will work or be warned that a globe valve or a rotary valve with special modi cations is in fact required As discussed there are certain situations where the more expensive globe valve is still a viable solution for the application ese situations typically occur where there are high pressure drops across the valve and when there is a high likelihood of cavitation However in most other scenarios there is a sizable advantage in specifying a rotary valve instead It is typically smaller in size well equipped to handle an equal percent characteristic requirement and perhaps most important far less expensive Peter Jessee P E is a process control application engineer for Valin Corporation a leading technical solutions provider for the technology energy life sciences natural resources and transportation industries Valin offers personalized order management on site eld support comprehensive training and applied expert engineering services utilizing automation uid management precision measurement process heating and ltration products Valin Corporation www valin com Call us at 515 224 2301 email us at sales@ checkall com Proudly manufactured in the USA SILENT OPERATION Our check valves close quickly and smoothly to avoid water hammer noise and vibration SPRING LOADED Multiple spring settings as well as seat and body materials available to meet your application needs UPSTREAM TRIM The upstream trim is protected from corrosive media mixing thereby extending valve service life And most lead times are less than one week Thats what makes our check valves Check All 2011PRO_ CheckAll 1 10 8 20 9 20 AM Neles L6 Series Butter y Valve Neles V port Segment Valve