Packless Silencer for a Venturi Control Valve

Abstract

A packless silencer for a Venturi control valve being a generally rectangular enclosed housing formed by four side walls and having an intake opening and a discharge opening. Four perforated baffles for each of the side walls are positioned inside of the housing, extend the length of the housing and are offset from the side walls to create an empty baffle space between the perforated baffles and the side walls the ends of the baffle space are covered by end caps.

1 . A packless silencer for close connection to a Venturi control valve, the packless silencer comprising:
 a. an enclosed housing having side walls, an intake opening, a discharge opening, and a length;   b. a perforated baffle corresponding to each of the side walls and positioned inside of the housing wherein each perforated baffle:
 i. extends the length of the housing; 
 ii. is offset from the corresponding side wall to form a baffle space between the perforated baffle and the corresponding side wall; and 
 iii. has a perforation pattern, and 
   c. baffle end caps to seal the baffle space adjacent the intake opening and the discharge opening.   
     
     
         2 . The packless silencer of  claim 1 , wherein the baffle space is empty. 
     
     
         3 . The packless silencer of  claim 1 , wherein baffle end caps are rounded. 
     
     
         4 . The packless silencer of  claim 1 , wherein the packless silencer is less than 24 inches in length in a direction of air flow through the packless silencer. 
     
     
         5 . The packless silencer of  claim 1 , wherein the perforated baffle has an area, and the perforation pattern comprises holes in the perforated baffle that occupy approximately 10% of the area of the perforated baffle. 
     
     
         6 . A duct control valve comprising:
 a. a Venturi control valve having an inlet opening and an outlet opening;   b. a packless silencer closely connected to either the inlet opening or the outlet opening of the Venturi control valve, the packless silencer comprising:
 i. an enclosed housing having side walls, an intake opening, a discharge opening, and a length; 
 ii. a perforated baffle corresponding to each of the side walls and positioned inside of the housing wherein each perforated baffle:
 (a) extends the length of the housing; 
 (b) is offset from the corresponding side wall to form a baffle space between the perforated baffle and the corresponding side wall; and 
 (c) has a perforation pattern, 
 
 iii. baffle end caps to seal the baffle space adjacent the intake opening and the discharge opening. 
   
     
     
         7 . The duct control valve of  claim 6 , wherein the baffle space is empty. 
     
     
         8 . The duct control valve of  claim 6 , wherein baffle end caps are rounded. 
     
     
         9 . The duct control valve of  claim 6 , wherein the packless silencer is less than 24 inches in length in a direction of air flow through the packless silencer. 
     
     
         10 . The duct control valve of  claim 6 , wherein the perforated baffle has an area, and the perforation pattern comprises holes in the perforated baffle that occupy approximately 10% of the area of the perforated baffle.