Check valve and liquid container with check valve

Abstract

A check valve, wherein a tubular body having a through-passage is installed, a valve element formed with an elastic material having an opening part near the tip thereof is installed, so as to cover the tubular body, and a skin body having an opening part near the tip thereof is installed so as to cover the valve element. A liquid container, comprising an outlet for discharging contents, wherein a reverse flow prevention valve having an opening part closed in normal state and opened when a pressure in the container rises is installed at the outlet, a measuring container is installed at the tip of the outlet, and a cap having an intake with a reverse flow prevention valve with an opening part closed in normal state and opened when the pressure in the container is negative is fitted to the opening part, whereby, when the contents once discharged into the measuring container is distributed at the time of metered distribution, the contents beyond a metered volume is prevented from flowing out of a container body.

1 . A check valve provided in a discharge opening of a fluid container, comprising: 
 a tubular body having a passage formed therein;    a valve body formed from an elastic material equipped with an opening near the tip thereof and provided so as to cover the tubular body; and    an outer casing equipped with an opening near the tip thereof and provided so as to cover the valve body;    
     
     
         2 . A check valve provided in a discharge opening of a fluid container, comprising: 
 a tubular body having a passage formed therein;    a valve body formed from an elastic material equipped with an opening near the tip thereof and provided so as to cover the tubular body;    an outer casing equipped with an opening near the tip thereof and provided so as to cover the valve body; and    a protection cap which exposes only the opening of the outer casing.    
     
     
         3 . The check valve described in  claim 1  or  claim 2 , wherein a space is provided between the tip of the tubular member and the inside surface of the outer casing in the discharge direction of the fluid, and the valve body is provided so as to isolate the space in the front and back.  
     
     
         4 . The check valve described in any one of  claim 1  through  claim 3 , wherein the valve body is formed from an elastic material, the opening provided near the head portion is a slit which is sealed and closed in the normal state by the elastic force of the valve body itself, and the slit is opened by pressure inside the container which breaks the seal.  
     
     
         5 . The check valve described in  claim 4 , wherein the slit is formed by combining a plurality of cuts.  
     
     
         6 . The check valve described in any one of  claim 1  through  claim 5 , wherein the tubular body and the valve body are formed integrally.  
     
     
         7 . The check valve described in any one of  claim 1  through  claim 3 , wherein an upper end of the tubular body and the inner surface of the valve body having mutually matching shapes, the passage of the tubular body diverges inside the tubular body, an opening is provided in the head portion at a position which avoids the opening of the valve body, the opening of the valve body is closed and the opening of the tubular body is covered by being sealed with the upper end surface of the tubular body in the normal state, and both seals are broken when the valve body expands in the direction of the discharge opening by a rise in the internal pressure of the container, whereby the opening of the valve body is opened to make it possible to discharge contents.  
     
     
         8 . The check valve described in any one of  claim 1  through  claim 3 , wherein an upper end of the tubular body and the inner surface of the valve body having mutually matching shapes, a protrusion which matches and covers the passage opening of the tubular body is provided on the inside of the head portion of the valve body, an opening is provided around the protrusion, the protrusion of the valve body covers the opening of the tubular body in the normal state, and the passage is opened to make it possible to discharge contents when the valve body protrusion is pushed out in the direction of the discharge opening by a rise in the internal pressure of the container.  
     
     
         9 . The check valve described in any one of  claim 1  through  claim 3 , wherein an upper end of the tubular body and the inner surface of the valve body having mutually matching shapes, a protrusion which protrudes in the direction of the discharge opening is provided on the head portion of the tubular body, the opening of the passage is provided around the protrusion, an opening which matches the protrusion of the tubular body and covers the passage is provided in the head portion of the valve body, the protrusion of the tubular body covers the opening of the valve body in the normal state, and the passage is opened to make it possible to discharge contents when the valve body expands in the direction of the discharge opening by a rise in the internal pressure of the container.  
     
     
         10 . The check valve described in any one of  claim 1  through  claim 3 , wherein an upper end of the tubular body and the inner surface of the valve body having mutually matching shapes, a protrusion which matches and covers the passage opening of the tubular body is provided on the inside of the head portion of the valve body, an opening is provided around the protrusion, the valve body is provided to be movable in the discharge direction between the tip of the tubular body and the inside of the outer casing, a spring is provided between the valve body and the outer casing to bias the valve body in the direction where the valve body is pushed against the tubular body in the normal state, the protrusion of the valve body covers the opening of the tubular body in the normal state, and the passage is opened to make it possible to discharge contents when the valve body protrusion is moved in the direction of the discharge opening against the resistance of the spring by a rise in the internal pressure of the container.  
     
     
         11 . The check valve described in any one of  claim 1  through  claim 3 , wherein an upper end of the tubular body and the inner surface of the valve body having mutually matching shapes, a protrusion which protrudes in the direction of the discharge opening is provided on the head portion of the tubular body, the opening of the passage is provided around the protrusion, an opening which matches the protrusion of the tubular body and covers the passage is provided in the head portion of the valve body, the valve body is provided to be movable in the discharge direction between the tip of the tubular body and the inside of the outer casing, a spring is provided between the valve body and the outer casing to bias the valve body in the direction where the valve body is pushed against the tubular body in the normal state, the protrusion of the tubular body covers the opening of the valve body in the normal state, and the passage is opened to make it possible to discharge contents when the valve body is moved in the direction of the discharge opening against the resistance of the spring by a rise in the internal pressure of the container.  
     
     
         12 . The check valve described in any one of  claim 7  through  claim 11 , wherein the valve body is open and contents are discharged from the discharge opening when an outside pressure applied to the container is less than or equal to a prescribed level, and the upper surface of the valve body and the inside surface of the outer casing are sealed to cover the opening of the valve body and stop discharge when the prescribed level is exceeded.  
     
     
         13 . A liquid container equipped with the check valve described in any one of  claim 1  through  claim 11 .  
     
     
         14 . A liquid container equipped with the check valve described in  claim 12 , wherein the container is a bottle formed by a flexible material.  
     
     
         15 . A liquid container equipped with the check valve described in  claim 12 , wherein the container is a gusset bag.  
     
     
         16 . A liquid container equipped with the check valve described in  claim 12 , wherein the container is a standing pouch.  
     
     
         17 . A liquid container equipped with a check valve and a discharge opening for discharging contents, comprising: 
 a check valve equipped with an opening which is closed in a normal state and opens by a rise in the internal pressure of the liquid container provided in said discharge opening;    a measuring container provided in the discharge end; and    a cap equipped with an air intake opening which includes the check valve equipped with the opening which is closed in the normal state and opens by a rise in the internal pressure of the liquid container provided in the opening;    wherein an amount of contents more than a quantity measured from the inside of the container body is not discharged from the container body when the contents that have been discharged temporarily into the inside of the measuring container are distributed at the time of measurement and distribution.    
     
     
         18 . A liquid container equipped with a check valve and a discharge opening for discharging contents, comprising: 
 a check valve provided in said discharge opening, wherein the check valve is equipped with a tubular body which includes a passage formed therein, a valve body which is provided near the tip to cover the tubular body and is formed from an elastic material equipped with an opening which is closed in a normal state and opens by a rise in the internal pressure of the liquid container, and an outer casing which covers the valve body and is equipped with an opening near the tip;    a measuring container provided in the discharge end; and    a cap equipped with an air intake opening which includes the check valve formed from an elastic material and equipped with the opening which is closed in the normal state and opens by a rise in the internal pressure of the liquid container near the tip provided in the opening;    wherein an amount of contents more than a quantity measured from the inside of the container body is not discharged from the container body when the contents that have been discharged temporarily into the inside of the measuring container are distributed at the time of measurement and distribution.    
     
     
         19 . The liquid container equipped with a check valve described in  claim 18 , wherein the opening of the valve body is a slit.