Valve for the venting circuit of a liquid tank

Abstract

Valve for the venting circuit of a liquid tank, said valve containing: a) a chamber ( 3 ) which opens into the tank and is connected via an aperture to the venting circuit; b) a float containing a head provided with a needle and able to slide vertically inside the chamber; and c) a closure member for closing off the venting aperture and itself having an aperture that can be closed off by the needle of the float, the closure member having a flexible seal which is capable of moving substantially vertically relative to the head of the float, said head being provided with a device for limiting the movement of the seal

1 . A valve for a venting circuit of a liquid tank, said valve comprising: 
 a) a chamber which opens into the tank and is connected via an aperture to the venting circuit;    b) a float comprising a head provided with a needle and able to slide vertically inside the chamber; and    c) a closure for closing off the venting aperture and itself comprising an aperture that can be closed off by the needle of the float,    the closure member comprising a flexible seal which is not affixed to a support and capable of moving substantially vertically relative to the head of the float, said head being provided with a limiter that limits the movement of the seal.    
   
   
       2 . The valve according to  claim 1 , in which the seal is a flat seal of substantially circular shape.  
   
   
       3 . The valve according to  claim 1 , in which the needle comprises a tip having a larger cross section than that of the aperture in the seal.  
   
   
       4 . The valve according to  claim 1 , in which the needle is substantially conical and its tip is in the form of a cross.  
   
   
       5 . The valve according to  claim 1 , in which the head of the float comprises vertical hooked fingers that surround the needle and have an upper end higher than the needle.  
   
   
       6 . The valve according to  claim 5 , in which the fingers are four in number and are arranged in the form of a cross with equal branches.  
   
   
       7 . The valve according to  claim 1 , in which the head of the float is of convex, domed or conical shape and/or includes drainage ribs on the surface thereof.  
   
   
       8 . The valve according to  claim 1 , in which the chamber has an upper part provided with lateral openings and in which at least one baffle is placed facing these openings.  
   
   
       9 . The valve according to  claim 8 , comprising two baffles, one placed on the inside of the chamber and the other on the outside of said chamber.  
   
   
       10 . The valve according to  claim 1 , which further comprises a cover comprising high-density polyethylene, and wherein said chamber and float are independently made of POM (polyoxymethylene) or PBT (polybutylene terephthalate), and wherein said seal is made of an elastomer.  
   
   
       11 . The valve according to  claim 1 , wherein the closure member consists essentially of a flexible seal which is not affixed to a support and capable of moving substantially vertically relative to the head of the float.  
   
   
       12 . The valve according to  claim 1 , wherein the closure member consists of a flexible seal which is not affixed to a support and capable of moving substantially vertically relative to the head of the float.