800X pressure drop balance valve is a valve which used for pressure drop balance between air conditioner supply and backwards water. This valve can increasesystem use rate, keep accurate constant value for pressure drop, and can max. slow the system noise, and super pressure drop cause damage to device. The point of 800X pressure drop balance valve better than other balance valve is it don't have actuator, competely use itsself pressure drop to achieve function of balance system, save energy and install space, is a intelligent valve.