ANTI-MIXING DIAPHRAGM VALVE

摘要

An anti-mixing diaphragm valve is provided with a valve body (1) therein, wherein a valve seat (12) is formed at the boundary between a first fluid passage (111) and a second fluid passage (112) within the valve body; the valve seat is coupled to a diaphragm (5) connected to a driving shaft (4) of a driving mechanism (3), causing the first fluid passage and the second fluid passage to be opened and closed thereby. On the valve seat a containing groove (123) is provided on the end face toward the diaphragm seat, so that when the valve seat and the diaphragm are closed, the containing groove and the diaphragm form a seal fit and constitute a tightly sealed valve auxiliary chamber, wherein a sterilization auxiliary valve (6) and an air evacuation auxiliary valve (7) are also provided on the valve body, with the sterilization auxiliary valve and the air evacuation auxiliary valve being provided respectively on the valve body where the valve auxiliary chamber is located and constituting a passage for communicating the valve auxiliary chamber and the exterior space of the valve body. Two switches enabling the valve chamber to be passed through are respectively formed by a left plate (121) and a right plate (122) of the valve seat and the diaphragm. If there is a leakage in the seal fit, the materials within the ducts will enter the containing groove first and then flow out from the normally-open air evacuation auxiliary valve, such that the anti-mixing diaphragm valve can be monitored and maintained in time, and unnecessary losses can be avoided.