Air duct valve arrangement

Abstract

An air duct valve arrangement for use ain an air circulation system comprising an air handler unit and an air treatment unit. The valve arrangement being disposed to prevent short-circuiting of the air treatment unit, but not to hinder the operation of the air handler unit.

1 . A valve arrangement comprising: 
 a first side;    a second side;    a plurality of valves displaceable between an open and a closed position;    valve biassing means for biassing said plurality of valves to the closed position;    said plurality of valves and said valve biassing means being configured and disposed such that 
 a flow of air coming from the first side can displace the plurality of valves from said closed position to said open position and pass through said plurality of valves, and  
 a flow of air coming from the second side will not be able to pass through the valves.  
   
     
     
         2 . A ventilation system for ventilating an enclosed space comprising 
 an air handling unit, said air handler unit receiving an air stream from said enclosed space through a return air pathway, and said air handler unit returning said air stream to said enclosed space through a supply air pathway; and    an air treatment unit connected to said return air pathway by an inlet duct and an outlet duct, such that air may pass into the air treatment unit from said return air pathway through said inlet duct, and such that air may pass out of the air treatment unit to said return air pathway through said outlet duct;    said inlet duct and said outlet duct being connected to said return air pathway such that said outlet duct is connected downstream of said inlet duct;    the improvement comprising a valve arrangement comprising    a first side;    a second side;    a plurality of valves displaceable between an open and a closed position;    valve biassing means for biassing said plurality of valves to the closed position;    said plurality of valves and said valve biassing means being configured and disposed such that 
 a flow of air coming from the first side can displace the plurality of valves from said closed position to said open position and pass through said plurality of valves, and  
 a flow of air coming from the second side will not be able to pass through the valves;  
 said valve arrangement being included in said return air pathway between said inlet duct and said outlet duct, such that said first side point in the direction of said inlet duct and such that said second side points in the direction of said outlet duct.  
   
     
     
         3 . A ventilation system for ventilating an enclosed space comprising 
 an air handling unit, said air handler unit receiving an air stream from said enclosed space through a return air pathway, and said air handler unit returning said air stream to said enclosed space through a supply air pathway; and    an air treatment unit connected to said supply air pathway by an inlet duct and an outlet duct, such that air may pass into the air treatment unit from said supply air pathway through said inlet duct, and such that air may pass out of the air treatment unit to said supply air pathway through said outlet duct;    said inlet duct and said outlet duct being connected to said supply air pathway such that said outlet duct is connected downstream of said inlet duct;    the improvement comprising a valve arrangement comprising    a first side;    a second side;    a plurality of valves displaceable between an open and a closed position;    valve biassing means for biassing said plurality of valves to the closed position;    said plurality of valves and said valve biassing means being configured and disposed such that 
 a flow of air coming from the first side can displace the plurality of valves from said closed position to said open position and pass through said plurality of valves, and  
 a flow of air coming from the second side will not be able to pass through the valves;  
 said valve arrangement being included in said supply air pathway between said inlet duct and said outlet duct, such that said first side point in the direction of said inlet duct and such that said second side points in the direction of said outlet duct.