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shorten the loop in the upper lift wire. Also, a drop or two of lubricating oil on the lever mechanism makes it work more smoothly. If you have a water closet tank that sweats and drops water on the deck, check the temperature of the water in the tank. If the temperature is very cold, this is  the  problem.  The  moisture  that  is  in  the  air surrounding the tank is condensing on the tank. The solution to the problem is (1) place a terry cloth on the tank to catch the water, (2) place a styrofoam insert in the tank, or (3) install a water tempering valve, which places some warm water in the tank while the tank is filling. Q13. A water leak at the base of a water closet tank normally indicates what type of problem? Q14. When water continues to run in the water closet bowl after the tank is fill, what most likely is the cause? FLUSHOMETERS LEARNING OBJECTIVE: Identify the types of flushometer valves, their operation, and methods  of  repair. Two major problems with flush valves are (1) the valve may run continuously, instead of shutting off at the right time, or (2) the valve may fail to deliver the desired amount of water (short flushing). Since flush valves are installed to avoid waste, they must be properly  maintained.  Once  you  understand  the operation of a valve, you can keep a flushometer in good repair. OPERATION OF DIAPHRAGM FLUSHOMETER Table 5-5 shows the operation of a diaphragm-type flushometer. Read through the table and study the diagrams   until   you   thoroughly   understand   the operation of the valve. OPERATION OF A PISTON-TYPE FLUSHOMETER The  piston-type  flushometer  valve  shown  in  figure 5-43 is opened by a lever which discharges the water from  the  dashpot  chamber.  The  reduced  water  pressure in the dashpot chamber then forces the piston assembly upward, which allows the water to enter the fixture. The closing of the valve is automatically controlled with a bypass through which the water enters the Table 5-5.—Operation of Diaphragm Flashometer STAGE 1 The diaphragm valve is in the ready position with all of the parts labeled. In this position the upper  and  lower  chambers  contain  the  same amount of pressure. Therefore, the diaphragm remains seated on the seat. STAGE 2 When  the  handle  is  moved  in  any  direction, the  plunger  opens  the  relief  valve,  which  allows the water from the upper chamber to flow into the lower chamber and causes the diaphragm to rise off of its seat. Water now continues to flow down the barrel and into the fixture. 5-29

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