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
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
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
OPERATION OF DIAPHRAGM
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
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
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.
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.