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Chesprocott Health District - News: How important is it to flush the line before or when installing a replacement toilet fill valve?
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Section: Frequently Asked Questions
How important is it to flush the line before or when installing a replacement toilet fill valve?
Last Update: Sep 03, 2002

It is always good practice and takes little time to remove the plunger and sealing ball (or diaphragm), invert a cup or can over the device and turn the supply valve on and off a few times. From our experience, most installers skip this step, but it is not uncommon to find gravel, broken off washers, solder beads, and other debris in or lodged between the seat and seal which prevents the valve from shutting off completely. If the fill valve will not close completely after installation (or after it has been in service for awhile) the first step should be to check if debris is fouling the valve and, if so, remove it by flushing or any other means.NOTE: CESCO’s fill valves are designed with a free path for water to carry most foreign particles through the valve without clogging the sealing component, but no fill valve is fully protected from malfunctioning if the debris is big enough.TIP: CESCO’s sealing balls are free floating components in its ATVB anti-siphon fill valves. Removal (for repair or replacement tasks) in the tank can be most easily done using a blunt-nose tweezers or by carefully turning the valve on slightly to force the ball to the top of the body for removal by hand.

FAQ Introduction
Common Toilet Troubleshooting Steps and some Frequently Asked Questions.
How long should it take to fill the tank and how can that be regulated?
The time to fill the tank varies with the design and size of the tank.
Why do toilet suppliers caution against over-tightening the nuts on toilet tank fixtures and trim?
Toilets are made of vitreous china, an exceptionally strong and durable material but one that can crack if subjected to a sharp impact or excessive stress.
What is the best way to adjust the water level in the tank?
The techniques vary by design among toilet fill valves.
Why must the refill tube always be kept above the water level?
How important is it to flush the line before or when installing a replacement toilet fill valve?
What are the leading causes of premature failure of all toilet tank fittings and what are the implications?
Considering Cutting the Overflow Tube Below the C-L Marking on the Fill Valve?
Some fill valve suppliers and "how to" guides recommend cutting the overflow tube at 1" below the C-L mark on the valve. When should this be done?
Conformance with anti-siphon installation requirements of the ASSE 1002 Standard
Why does the critical level (C-L) mark of a toilet fill valve have to be a minimum of 1" above the top of the overflow tube (flood plain) to be in conformance with anti-siphon installation requirements of the ASSE 1002 Standard?
What is water hammer, why is it a problem, and what can be done to eliminate it?
Water hammer is the instantaneous increase in water pressure that occurs when water flowing in a pipe stops abruptly (as with a snap action valve closing).
Why does CESCO suggest that toilet repairs should be done by licensed plumber?
Should plumber’s putty, thread sealant, grease or lubricants ever be used in the installation or repairs of toilet fill
What is the least understood and most ignored routine maintenance tasks?
Why is it important to recognize and conform to anti-siphon codes?
What is thermal expansion in residential water supply pipes, why is it a problem, and what is the solution?
Why do many leading suppliers of [plastic] fill valves disclaim responsibility/reliability from product failures?
How much water should be in the bowl after the flushing cycle is completed and the fill valve shuts off?


Barry E. Walter Sr. Co. 2550 East Platte Avenue - Fort Morgan, CO 80701 - 800-767-5552

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