Linkage position of intelligent locator

If it comes as a complete set, it has already undergone automatic stroke calibration at the time of manufacture

If the requirements are not high, remote control of the valve opening can meet the needs, and no adjustment is necessary. There is no fixed requirement as to where the feedback rod must be positioned. This is flexible: as long as the requirements are met, you can place it anywhere ； The locator can be adjusted or left unchanged.

Generally, add 50% of the signal, with the feedback lever in the horizontal position

Agree with what was said above; the 12mA signal feedback rod is in a horizontal position

Don’t mislead; it’s not necessarily the case. The horizontal position is merely a requirement recommended by the manufacturer. In short, as long as the requirements are met, it’s okay even if the skill level isn’t high; sometimes it’s troublesome to bring the skill level up to an optimal level. Why must it be at an optimal level? We can often achieve a high level of performance even when we’re not at our best.

Each actuator has a maximum operating angle range; therefore, for the feedback rod of the control valve, the full stroke range of the valve must not exceed this angle range. To ensure linearity and meet operational requirements, it is necessary that the feedback rod be in a horizontal position when the valve is at 50% open, meaning that the actuator’s feedback system is also at 50% of its angle. This is essential to ensure optimal operation of the actuator. Due to the varying sizes of control valves, the full stroke of their valve stems also differs. Therefore, for control valves that are operated at a small opening degree, it is possible for them to function within the angle range of the positioner, even without trying to find that 50% position. However, the fact that they can function does not mean that they are in their optimal operating condition. Just as with pressure gauges, it is best for the pressure reading to be at the middle of the gauge scale during normal operation; it cannot be said that the gauge cannot be used just because the reading is near zero. These days, the calibration of many positioners is designed to be user-friendly; sometimes all that’s needed is to press a button or use a screwdriver, and no further manual intervention is required. However, this automatic calibration does not mean that the positioner does not try to find the 50% point of balance – it simply finds that point automatically. If the full range of motion of the control valve exceeds the angular range of the positioner, an error will be generated, and the system may even behave in a rather unresponsive manner, continuing to attempt calibration repeatedly. In such cases, a human must intervene to re-establish the 50% point. Therefore, even user-friendly positioners still require a balance point.

The theory is one thing, but there are various situations; experienced comrades remain experienced comrades after all

Disagree: 1. Meeting usage requirements means the performance should be sufficient; if it’s sufficient, then why is there a ‘best’ version? The role of a regulator in determining whether a control system is optimal is actually extremely limited. 2. Using the pressure gauge as an example is too extreme; does a measurement value around 0 still have any meaning? Will it meet the requirements? We often choose a range at twice the actual measurement value at the pump outlet; even for pressure measurement in pressure vessels, it’s not necessary to stay within the specified range – there are always standard product specifications that go outside this range. Choosing a slightly larger range is beneficial for longer \"service life\". It’s fine as long as the requirements are met.

Now, before an intelligent locator is put into use, it goes through a self-check process; once the parameters are set and the self-check is successful, it can be used

Upvote on floor 7! ! ! The others shouldn’t try too hard to show off how experienced they are; there will always be different opinions on various issues, and others are simply telling you the correct debugging principles.