The 800x pressure differential balance valve is a valve used for air conditioning system supply/backwater to balance differential pressure. The valve can improve the utilization of the system. Keep the differential pressure precise and constant, and minimize the noise of the system and the damage caused by excessive pressure difference. 800 x differential pressure balance valve is superior to other balancing valve is not executing agency, completely depends on the pressure difference between the medium itself to balance system function, save energy and installation space, is a kind of intelligent valve.