Valve, in particular for compressors

Abstract

Valve, in particular for compressors, comprising a seat ( 1 ) provided with at least one flow way ( 111 ), an obturator member ( 4 ) able to obstruct said flow way ( 111 ) and movable with respect to said seat in a given direction, and means ( 5 ) for resiliently stressing said obturator ( 4 ), which are able to force said obturator ( 4 ) into a given position and are active in the direction of movement thereof; said resilient stressing means ( 5 ) comprise at least one cylindrical helical compression spring ( 5 ), characterized by the presence, between all the turns and along the entire working length of the spring ( 5 ), of inter-turn apertures.

1 . Valve for reciprocating compressors, comprising a seat ( 1 ) provided with at least one flow way ( 111 ), an obturator member ( 4 ) able to obstruct said flow way ( 111 ) and movable with respect to said seat in a given direction, and means ( 5 ) for resiliently stressing said obturator ( 4 ), which are able to force said obturator ( 4 ) into a given position and are active in the direction of movement thereof; said resilient stressing means ( 5 ) comprise at least one helical compression spring ( 5 ), characterized by the presence, between all the turns and along the entire working length of the spring ( 5 ), both in the rest condition ( FIG. 4A ) and in the compression condition ( FIG. 4B ) of inter-turn apertures, and further characterized by a taper ratio variation of both end turns in that the difference in diameter between the end turns ( 105 ) and the immediately adjacent turns ( 205 ) is in the region of at least one-and-a-half times the cross-section of the metal wire which forms the said spring. 
   
   
       2 . Valve according to  claim 1 , in which the difference in diameter between both end turns ( 105 ) and the turns ( 205 ) immediately adjacent to them is half times or more the cross-section of the metal wire which forms the said spring. 
   
   
       3 . Valve according to  claim 1 , in which both end turns ( 105 ) have a diameter less than that of the immediately adjacent turns ( 205 ). 
   
   
       4 . Valve according to  claim 1 , in which both end turns ( 105 ) have a diameter more than that of the immediately adjacent turns ( 205 ). 
   
   
       5 . Valve according to  claim 1  in which one end turn ( 105 ) has a diameter less than that of the immediately adjacent turns ( 205 ) and the other end turn ( 105 ) has a diameter more than that of the immediately adjacent turns ( 205 ). 
   
   
       6 . Valve according to  claim 3 , in which said end turns are ground. 
   
   
       7 . Valve according to  claim 1 , in which the pitch of said springs is variable. 
   
   
       8 . Valve according to  claim 7 , in which said resilient stressing means ( 5 ) are arranged inside a housing ( 402 ) which is suitably positioned with respect to said obturator member ( 4 ). 
   
   
       9 . Valve according to  claim 8 , in which protection members ( 412 ,  422 ), preferably made of plastic material, are arranged inside the housing which accommodates the spring. 
   
   
       10 . Valve according to  claim 3 , in which said end turns are conical.