Can the coil of a solenoid valve remain energized for a long time?
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Is it the same for RT, or do different brands and models vary?
There is no problem with keeping the solenoid valve powered on for a long time.
No problem; it can remain powered on continuously
Oh, then the coil won’t overheat and get damaged due to remaining charged for a long time, right?
Generally, there are no problems; it was carefully considered during the design phase
Currently, there are no issues with solenoid valves remaining powered on for extended periods of time, but during design it is necessary to ensure that the surface temperature of the solenoid valves meets the requirements specified for different explosion-proof zones. Based on my experience, the surface temperature of the valve can reach up to 70 degrees, which can easily cause burns if it comes into contact with human skin.
Typically, interlocks are designed to be of the solenoid excitation safety type; that is, when the interlock is in normal operation, the solenoid remains excited, which means it stays powered on continuously. This facilitates the detection of power supply failures that could cause the solenoid to activate.
It remains charged for a long time; otherwise, why would there be requirements for FC and FO at the site? FC: Turn off after power loss. So it remains charged during normal operation.
It’s fine to have it powered on constantly. The solenoid valves used for interlocking in our factory operate continuously while powered on. Solenoids used for interlocking usually operate in a continuously powered state, and this is necessary. However, it should be noted that the coil generates heat when powered, and continuous operation can lead to overheating; therefore, cooling measures are generally required. For solenoids that are not used for interlocking, it is best not to keep the coil energized continuously.
It can remain charged for a long time without any problems. This post was last edited by marry on 2009-4-2 10:30.]
Operating under a continuous voltage for an extended period is not a problem, but it will definitely affect the lifespan of the coil. I remember there was a new product that could solve this problem: a memory-type dual-coil self-holding solenoid valve, which could change its valve position simply by being powered for an instant.
In chemical and refining processes, equipment is usually charged electrically; otherwise, faults won’t be detected. Only if a chain reaction occurs and it becomes clear that excitation is not possible will big problems arise
From the perspective of the \"fail-safe\" principle, the coil should remain energized over the long term. Because if it is not electrified under normal conditions and power is supplied only when action is required, the contacts may fail to function due to mechanical failures or other reasons, leading to serious accidents. When the coil is normally charged and the contacts are closed, there are two situations that cause the contacts to move: 1. Moving in response to a command, in order to prevent serious accidents in the manufacturing process or equipment ； 2. A fault in the solenoid coil itself causes it to operate. Although unwanted actions can occur due to faults in the solenoid valve itself, major accidents in the process or equipment can be avoided, making it \"fail-safe\".