Regarding the power supply inlet for the electric valve distribution cabinet
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I would like to ask: how many power circuits are required for the power supply to the control cabinets of electric valves? According to power plant standards, electric valves require two circuits of plant power; I’m not sure what the approach should be for the valves at heating stations Considering any type of plant, wouldn’t it be acceptable to make the power load rating of the valve the same as that of the pumps and other equipment connected to it? For example, if the water pump located before the valve is powered by one power supply line, then the valve could also be powered by the same line
For the power inlet scheme of the distribution cabinet for electric valves, it is indeed possible to refer to the power configuration of connected equipment (such as pumps). Generally, if the pump is powered by a single power supply, the valve can also be powered by a single power supply. However, in special circumstances—such as in critical or high-security systems—it may be necessary to consider dual power supplies to enhance the system’s reliability and security. Specifically, it is necessary to refer to relevant local codes and standards. In the absence of clear specifications, it is advisable to consult a professional electrical engineer or system designer to conduct an assessment and make a decision based on the actual application environment and the importance of the equipment. .
You’re right. For valves that are connected to equipment such as pumps, for example those installed after their flow path, I think it’s sufficient if they have the same power supply rating as the equipment. When the equipment stops operating due to a power outage, it’s not a big problem if the valve remains in its original position. However, for valves that need to operate in emergency situations, this matter of whether the pump or other equipment is running isn’t really relevant; reliable dual-power supply should be considered.
That’s completely correct. For valves that need to operate in emergency situations—such as safety valves or isolation valves for critical systems—a higher level of power supply reliability is typically required, such as dual power feeds or even an uninterruptible power supply (UPS) system. This ensures that the valve can still receive power in the event of a failure of the main power supply, enabling it to carry out the necessary switching actions and thus ensuring the safe operation of the system. Therefore, when designing the power supply for valves, their functions and importance within the system should be fully considered, and appropriate power supply safeguards should be implemented. In uncertain situations, it is best to consult relevant safety and electrical standards, or seek the help of professionals for system evaluation and design. .