Step control technology
Thread Content
This post was last edited by tiandiyi*an on 2017-8-15 11:15. In a proportional control circuit, the two pressure ranges for the proportional valve should be divided equally into 0.02~0.06 MPa and 0.06~0.10 MPa. Is this correct?
Current proportional control is generally implemented via a computer, without the need for settings on the valves; it is sufficient for the air supply pressure to be the same for each valve.
Now it’s all DCS; the zoning is done directly on the DCS, and the input signals for the control valves are all 4-20mA.
Current proportional control is generally implemented via a computer, without the need for settings on the valves; it is sufficient for the air supply pressure to be the same for each valve.
In a split-control system, there are two types of configurations for the two control valves: two valves that operate in the same direction (both open or both closed), and two valves that operate in opposite directions (one open and one closed, or one closed and one open)； The pneumatic signal for each control valve is 20~100 kPa; the range can be adjusted by using an electric valve positioner, or within the DCS ； There are three types of splitting scenarios: splitting at a single point, having a coverage area near the splitting point, and having a dead zone near the splitting point.