【Q&A Question 150】2016.09.17
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【Q&A Question 150】September 17, 2016: How to switch from a pilot-operated valve to a control valve for operation? The answer key will be available after responding; scoring is based on answering the key points. (1) Turn off the drain valve, and contact the operator to adjust the control valve; request the operator to set the valve opening to 0%, 50%, and 100% respectively for tracking verification. (2) Open the downstream valve fully. (3) Set a certain opening degree for the control valve and open the virtual latch of the upstream valve until there is fluctuation in the indication. (4) Slowly open the upstream valve while slowly closing the branch line valve, aiming for minimal fluctuations, until the branch line is fully closed and the upstream valve is fully open. (5) Adjust the opening degree of the control valve to keep the controlled parameter within the normal range.
Contact the indoor staff to check whether the control valve operates smoothly, close the vent valve, and apply wind pressure signals of 0%, 50%, and 100% for tracking verification. Open the downstream valve fully. Release the slight hold on the upstream valve until the local primary meter indicates a slight movement and then stops. Gradually open the upstream valve while slowly closing the branch line valve, aiming for the smallest possible fluctuations as indicated by the on-site readings, until the branch line is fully closed and the upstream valve is fully open. Adjust to an appropriate opening degree to keep the controlled parameters within the normal range.
First, close the control valve and open the protective valves located before and after it. Slowly close the branch line valve while simultaneously opening the control valve, ensuring that the flow rate remains within the controlled range until the branch line valve is completely closed.
In coordination with the slow closing of the control valve, slowly open the bypass valve until the control valve is fully closed. Once the parameters have stabilized, slowly close the valve below the control valve until it is shut off; then close the valve above it. Open the drain and vent valves – be careful to ensure safety.
Ugh, I got the question wrong; it was exactly the opposite
Contact the indoor staff to check whether the control valve operates smoothly, close the vent valve, and apply wind pressure signals of 0%, 50%, and 100% for tracking verification. Open the downstream valve fully. Release the slight hold on the upstream valve until the local primary meter indicates a slight movement and then stops. Gradually open the upstream valve while slowly closing the branch line valve, aiming for the smallest possible fluctuations as indicated by the on-site readings, until the branch line is fully closed and the upstream valve is fully open.