the preferred embodiments according to the present invention will now be described in detail in accordance with the accompanying drawings . fig3 is a schematic diagram showing a refrigerator having a water dispenser according to one embodiment of the present invention . in the drawing , reference numeral 100 denotes a main body of the refrigerator , which has a freezing compartment 100a and a refrigerating compartment 100b . the refrigerating compartment 100b has a door 40 for closing and opening and having at its front surface a recessed portion serving as a receptacle receiving portion 41 for receiving a cup . also , the door 40 has on its rear surface a water storage tank 50 having a water discharge outlet . an inlet end of a water feed pipe 60 is separably coupled to the discharge outlet of the water storage tank 50 . the piple 60 includes a water dispensing outlet situated in the receptacle receiving portion 41 . the water storage tank 50 is provided at a predetermined position thereof with a pump 55 for supplying water ( cold water ) to the receptacle receiving portion 41 . meanwhile , the water dispenser for the refrigerator according to the present invention provides means for preventing a leakage of the water which may occur when the water feed pipe 60 is separated from the water storage tank 50 . now , the leakage prevention means will be described with reference to fig4 ( a ) and 4 ( b ), and fig5 . as shown in fig4 ( a ) and 4 ( b ), the leakage prevention means is composed of a first valve 70 and a second valve 80 . the first valve 70 includes , as shown in fig4 ( a ), a fixing plate 71 fixedly secured at an inner side of a discharge pipe 51 ( which defines a discharge outlet of the tank 50 ), an axial shaft 72 extending through a middle portion of the fixing plate 71 , a cap 73 fixed at one end portion of the shaft 72 , a supporting plate 74 disposed at the other end portion of the shaft 72 , such that an inner surface of the discharge pipe 51 contacts the supporting plate 74 , and an elastic member 75 having one end fixed to an inner side of the fixing plate 71 and the other end fixed to the supporting plate 74 . the fixing plate 71 is provided with a plurality of holes 71a serving as fluid passages for discharging the drinkable water ( cold water ). the outer side of the supporting plate 74 contacts an inner peripheral surface of the discharge pipe 51 for accurately guiding a straight movement of the shaft 72 . the supporting plate 74 also has a plurality of holes 74a similar to those of the fixing plate 71 , which serve as fluid passages for discharging the water ( cold water ). when the water feed pipe 60 is separated from the water storage tank 50 , the shaft 72 is returned to its initial position by the elastic member 75 disposed between the fixing plate 71 and the supporting plate 74 . fig4 ( b ) is a schematic sectional view showing the water feed pipe 60 coupled to a case 90 in which the tank 50 is installed . the second valve 80 includes a connecting rod 81 adapted to exercise a straight line motion through the hollows formed by both the water feed pipe 60 and a connecting pipe 90a . a cap 82 is coupled to one end portion of the connecting rod 81 for opening or blocking the water feed pipe 60 according to the straight line motion of the connecting rod 81 . a pushing member 83 is coupled to the other end of the connecting rod 81 for pushing the supporting plate 74 , when the first valve 70 and the second valve 90 are coupled each other , thereby opening the discharge pipe 51 by displacing the cap 72 of the first valve 70 ( see fig4 ( a ) and fig5 ). an elastic member 84 has one end thereof connected to the pushing member 83 and the other end connected to a pressing member 92 . the water feed pipe 60 is coupled to the case 90 having at one side thereof the connecting pipe 90a for encompassing the second valve 80 therein . also , the connecting pipe 90a of the case 90 is provided with a gasket portion 91 serving as a sealing member to prevent the leakage of water when the discharge pipe 51 and the water feed pipe 60 are connected in communication with one another . the gasket 91 portion of the connecting pipe 90a is , as shown in fig4 ( b ), provided with the pressing member 92 such that the gasket portion 91 is not detached from the case 90 . on an inner peripheral surface of the gasket 91 are formed small - sized sealing projections 91a for preventing the leakage of the water ( cold water ) between the discharge pipe 51 and the gasket 91 . assuming that the water storage tank 50 and the water feed pipe 60 are not yet coupled to each other , i . e ., the discharge pipe 51 is not inserted within the connecting pipe 90a , the present invention will be described below . when the water supply pipe 60 is separate from the water storage tank 50 , the shaft 72 of the first valve 70 attached to the water storage tank 50 is , as shown in fig4 ( a ), at its initial position , i . e ., the cap 73 blocks the discharge pipe 51 due to the operation of the elastic member 75 . also , the connecting rod 81 of the second valve 80 attached to the water feed pipe 60 is , as shown in fig4 ( b ), at its initial position , i . e ., the cap 82 blocks the connecting pipe 90a due to the operation of the elastic member 84 . fig5 shows the water storage tank 50 coupled to the gasket 91 . contact is made between the supporting member 74 and the pressing member 83 , thus causing each of the caps 73 and 82 of the first and second valves 70 and 80 to open the water storage tank 50 and the water feed pipe 60 , respectively . this is because after initial contact between the supporting member 74 and the pressing member 83 occurs , a continued pushing of the water storage tank towards the water feed pipe 60 moves the shaft 72 in the left direction and the connecting rod 81 in the right direction as seen in fig5 . thus , the water storage tank 50 communicates with the water feed pipe 60 , and the water can be thus supplied by the driving of the pump 33 . thereafter , if the water storage tank 50 and the water feed pipe 60 are uncoupled from each other , e . g ., for cleaning them or filling the water storage tank 50 , the shaft 72 and the connecting rod 81 are respectively moved to their initial positions by the respective elastic members 75 and 84 of the first and second valves 70 and 80 . at this time , it should be noted that no water leaks because the caps 73 , 82 of the first and second valves 70 and 80 block the discharge pipe 51 and the water feed pipe 60 . as described above , the water dispenser for the refrigerator according to the preferred embodiment of the present invention has advantages in that even when the water storage tank 50 and the water feed pipe 60 are uncoupled , with a certain amount of the water still contained in the water storage tank 50 and the water feed pipe 60 , no water leaks from the water storage and the water feed pipe 60 , so that the water ( cold water ) can be saved and sanitary conditions can be maintained . meanwhile , fig6 is a perspective view showing the water dispenser for the refrigerator according to a second embodiment of the present invention . the water dispenser for the refrigerator according to a second embodiment of the present invention includes water feeding means 200 for supplying the water ( cold water ) to an inner side of the refrigerating compartment door 40 , and operating means 300 including a water feeding pump 320 disposed at a lower side of the water feeding means 200 . and , the operating means 300 is controlled through a switch 111 installed at one side of the water feeding chamber 110 . fig7 ( a ) and ( b ) are an exploded sectional view and top view , respectively , of the second embodiment of the present invention . in fig7 ( a ), reference numeral 200 denotes water feeding means . the water feeding means 200 includes a guide case 210 , a plurality of water receptacles 230 in the guide case 210 , and a water feed valve 232 ( see fig8 ) at an outlet side of the water receptacle 230 . as shown in fig7 ( a ) and ( b ), the guide case 210 includes a cover 220 coupled at an upper side of the guide case 210 and having holes 221 for inserting the water receptacles 230 , and a water level adjusting groove 212 of a slightly recessed shape at a lower side of the guide case 210 . also , a cap 231 having a water feed valve 232 at one end thereof is coupled to the outlet side of each water receptacle 230 , as shown in fig8 . the water level adjusting groove 212 has projections 213 therein adapted to open the water feed valves 232 of respective water storage receptacles 230 , and a discharge tube 240 for discharging the water ( cold water ) from the water storage receptacle 230 , as shown in fig7 ( a ) and fig8 . the number of the water level adjusting grooves 212 may be increased or decreased , depending upon the number of the water receptacles 230 to be used . the discharge tube 240 is seated in place within an insertion groove 310 formed at an upper portion of the operating means 300 and has a discharge outlet 311 arranged to be opened when the discharge tube 240 is seated . that is , a valve 240a disposed in the tube 240 is automatically opened when the tube 240 is seated , as shown in fig8 . fig8 is a sectional view of the water dispenser for the refrigerator according to the second embodiment of the present invention , when using the water dispenser . referring to fig8 the water dispenser discharges water ( cold water ) from the water storage receptacles 230 into the discharge tube 240 of the guide case 210 by means of the water feeding pump 320 . if the cap 231 is coupled to the outlet side of the water storage receptacle 230 , and then the water storage receptacle 230 is inserted in an inverted state through the hole in the cover 220 of the guide case 210 , the cap 231 faces the top surface of a projection 213 formed on the bottom surface of the water level adjusting groove 212 . accordingly , the water feed valve 232 of the cap 231 receives the pressure due to the weight of the water storage receptacle 230 , and thus the water feed valve 232 is opened . meanwhile , it should be noted that the entrance or top end 241 of the discharge tube 240 which upwardly projected through the water level adjusting groove 212 of the guide case 210 , must be always located lower than the lower edge 233 of the cap 231 . the depth h of the water level adjusting groove 212 is equal to or greater than a depth h extending from a floor 212a of the groove to the lower edge 233 of the cap 231 . a depth h1 extends from the floor 212a to the top end 241 of the tube 240 . the depth h of the water level adjusting groove should meet the following relationship : preferably , the depth h of the water level adjusting groove 212 is defined to meet the above relationship so as to minimize the collected amount of the water at the minimum depth . a volume of the water designated by a rectangle a is defined by a difference between the depth h1 and the depth h . only that volume a can be discharged to the outside , and the water receptacle 230 can replenish that volume a . such procedures continue to be repeated , which allows the water to be constantly discharged and replenished . the respective operations of the water feed valve 232 and the discharge tube 240 are similar to operations of the first and second valves of the foregoing first embodiment of the present invention , of which details are omitted without further explanation . since the water dispenser for the refrigerator according to the second embodiment of the present invention is operated to constantly discharge the water with the detecting operation of the switch , the probability of malfunction due to overuse of the water feeding lever can be lowered , and the reliability of the products can be enhanced .