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2. 5 Signs It's Time To Replace Your Toilet, According To ... - AOL

   www.aol.com/lifestyle/5-signs-time-replace...

   A well-running toilet is essential to a bathroom that's clean, useful, and odor-free. But toilets aren't invincible. Like other parts of the home, toilets need intermittent repairs, especially to ...

3. Ballcock - Wikipedia

   en.wikipedia.org/wiki/Ballcock

   When the handle of a flush toilet with a tank (British, cistern) is turned, a discharge mechanism is activated by means of a rod or chain. The mechanism may be a flapper valve, which is designed to sink more slowly than the water, which will exit to the toilet bowl below, so that the tank may empty.

4. Flush toilet - Wikipedia

   en.wikipedia.org/wiki/Flush_toilet

   The larger flapper-flush valve is used on toilets that use less water, such as 1.6 US gal (6.1 L) per flush. Some have a bell inlet for a faster more effective flush. A problem with the valve type flush mechanism is that it invariably starts to leak after a couple of years use due to wear and tear of the valve, particles, etc. trapped in the valve.

5. Check valve - Wikipedia

   en.wikipedia.org/wiki/Check_valve

   A check valve, non-return valve, reflux valve, retention valve, foot valve, or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction. [ 1 ] Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave.

6. Nozzle and flapper - Wikipedia

   en.wikipedia.org/wiki/Nozzle_and_flapper

   The nozzle and flapper mechanism is a displacement type detector which converts mechanical movement into a pressure signal by covering the opening of a nozzle with a flat plate called the flapper. [1] This restricts fluid flow through the nozzle and generates a pressure signal.

7. Downhole safety valve - Wikipedia

   en.wikipedia.org/wiki/Downhole_safety_valve

   When hydraulic pressure is applied down a control line, the hydraulic pressure forces a sleeve within the valve to slide downwards. This movement compresses a large spring and pushes the flapper downwards to open the valve. When hydraulic pressure is removed, the spring pushes the sleeve back up and causes the flapper to shut.