What is the power-off UPS protection for electric valves?

After the electric valve loses power, the UPS acts as a backup power source, supplying electricity to the valve to prevent it from being unable to operate once powered off

Some computers are also equipped with this feature; in the event of a power outage, it provides automatic power supply, giving you time to save your documents

A UPS is similar to a car battery; it serves as a backup power source

Typically, a pneumatic valve contains a spring; when the air supply is interrupted, the spring pushes the valve stem to the fail open or fail close position as designed. However, electric valves do not have such a spring design; when the power supply is lost, the valve stem cannot return to the open or closed position and remains in its current state. If the process requires returning to the open or closed state, a UPS design is needed to ensure that the motor still has the power to reach the fail open or fail closed state specified by the design.

Typically, the main control building of an operation room is equipped with a UPS, which is a backup power source that activates automatically in case of a power outage or emergency

This view is somewhat supported; such an explanation is quite reasonable

When a pneumatic control valve loses its electrical control signal during operation, there are three design options: using a spring or diaphragm mechanism to achieve full closure, full opening, or retention in the current position. This can be determined in advance based on the operating conditions. Pneumatic on-off valves can be set to open or close completely in the event of a power loss, while electric valves are driven by motors; once the power is lost, they stop operating at their current position. To ensure continued operation, a UPS supply is necessary. However, it is not sufficient to rely solely on the UPS power supply in the control room, as such systems are generally designed to provide DC24V or AC220V for low-power loads. Electric valves, on the other hand, require AC220/380V, so special considerations must be taken when using the UPS power supply from the control room. .