This is a sprung return valve, these valves slam shut with a spring mechanism. This is what will be causing the banging. They are not the best choice for a high flow rate heat pump. Rotary valves e.g ESBE are a better option.
This is a sprung return valve, these valves slam shut with a spring mechanism. This is what will be causing the banging. They are not the best choice for a high flow rate heat pump. Rotary valves e.g ESBE are a better option.