According to Control Global: Greg: I became sensitized to the need for control valves to respond to small signal changes during my many decades of doing pH applications, as described in my ISA book, Advanced pH Measurement and Control, Third Edition. A resolution limit of 0.1% for even the best control valves could translate to a 2 to 12 pH oscillation in a strong acid and strong base neutralization. Since resolution limits are in percent of valve capacity, this translated to an increasing need for multiple stages of neutralization, with the first stage setpoint on the flattest part of the titration

Looking to control your slide gate pneumatically? According to Powder & Bulk Solids: In most bulk powder handling applications, slide gates are predominantly used to either completely shut off or completely open the flow of material. In some instances, it may become necessary to limit the amount of material that is allowed to pass through the gate. When controlling the flow of dry bulk solid materials there are varying controls that can be used to meter the volume and flow rate. Flow controls are components that can be added to a pneumatic actuator to assist in controlling material flow. Pneumatic

There are benefits to using a digital valve positioner for your next application. According to AZO Materials: The article will then look at valve types very briefly before focusing on digital positioners. It will examine the expectations that the user should have with regards to digital positioners, for example, whether they are an individual in the engineering team that will have to spec out positioners or an end-user. A number of considerations for selecting a good digital positioner will also be explored, looking at what potential buyers should be looking for, features that would be beneficial in the longer term and