The main purpose is to prevent system water from flowing back into the boiler. Since normal pressure boilers are generally designed with an open water tank or a discharge pipe that is normally open to the atmosphere, if water flows back from the system and fills the boiler, all system water will overflow from the boiler. If we come, we can flood the whole boiler room. When there was no opening and closing valve design in the past, as soon as the normal pressure boiler was shut down, the boiler staff had to immediately close the return water valve to ensure that the water did not flow back. The opening and closing valve solves this problem
KJH41X hydraulic control opening and closing valve is suitable for normal pressure hot water boilers and is commonly used