What is the purpose of split control loop in a control valve

Field Instrumentation
1

How to use split control loop to control the control valve

2

Split range control is used to.

  1. Back up the system, for example, opening one cv is not enough energy to heat one process, so another cv needs to open to support more heat.
  2. Used to maintain one condition, for example, to maintain ph 7@8. Then we need two CV, one’s to control acid and another one to control alkali