Sealing Bag

Abstract

A sealing bag includes a valve 3 which is fitted to a bag body and which communicates interior and exterior of the bag body with each other. A ball valve element 5 of the valve 3 is placed in a tapered passageway 8 so as to be advanceable toward and retreatable from the interior side of the bag body, and can close the tapered passageway 8 . A screw type cap 6 of the valve 3 , which is fitted to a fitting hole 27 of a valve body 4 so as to be advanceable toward and retreatable from a smaller-diameter end portion of the tapered passageway 8 , has a stopper portion which is to be inserted into the fitting hole 27 and contactable with the ball valve element 5.

1 . A sealing bag comprising:
 a bag body which has an opening portion for allowing contents to be put in and out and which is made from a material impervious to fluid;   a sealing mechanism which is provided on the bag body and which can open and close the opening portion, wherein the sealing mechanism, when closing the opening portion, seals the opening portion; and   a valve which is fitted to the bag body and which can communicate interior of the bag body and exterior of the bag body with each other, wherein   the valve includes:   a valve body having a tapered passageway which is tapered increasingly toward an interior side of the bag body, and a fitting hole provided at a proximity to a larger-diameter end portion of the tapered passageway so as to communicate with the tapered passageway;   a valve element which is placed in the tapered passageway so as to be advanceable toward and retreatable from the interior side of the bag body and which can close the tapered passageway; and   a cap having a stopper portion which is inserted into the fitting hole and contactable with the valve element, and a connecting port which communicates with the tapered passageway, the cap being fitted to the fitting hole so as to be advanceable toward and retreatable from a smaller-diameter end portion of the tapered passageway, and wherein   the stopper portion is brought into contact with the valve element closing the tapered passageway as the cap is advanced toward the smaller-diameter end portion of the tapered passageway.   
   
   
       2 . The sealing bag as claimed in  claim 1 , wherein
 the valve body has a claviformed passageway which adjoins the smaller-diameter end portion-of the tapered passageway and which is claviformed increasingly toward the interior side of the bag body.   
   
   
       3 . The sealing bag as claimed in  claim 1 , wherein
 the cap has a fall preventing portion for preventing the cap from falling off from the valve body.   
   
   
       4 . The sealing bag as claimed in  claim 1 , wherein
 the valve element is formed from a material softer and more elastic than a material of the valve body.   
   
   
       5 . The sealing bag as claimed in  claim 1 , wherein
 the cap is formed from a material softer and more elastic than a material of the valve body.   
   
   
       6 . The sealing bag as claimed in  claim 1 , wherein
 the bag body includes:   a bag-front-side sheet on which the valve is fitted at an edge portion thereof;   a bag-rear-side sheet opposed to the bag-front-side sheet; and   a gusset which couples the bag-front-side sheet and the bag-rear-side sheet to each other and which is bent inward.