Commercial Flush Valves

A flush valve releases a set amount of water when a toilet or urinal is flushed. In commercial toilets and urinals, these valves are replaced by flushometers.  

This page will provide an overview of manual and hands-free commercial flushometers.

Commercial Flush Valves

How Does a Manual Flushometer Work?

A flushometer is an automatically timed or self-closing valve with an equal pressure of water in the upper and lower chamber that keeps the rubber diaphragm tightly closed.

When you push the flush handle, it activates a relief valve that tilts the diaphragm or piston just enough to allow water to flow from the upper chamber to the lower chamber, and that allows pressurized water to displace the diaphragm or piston. The pressurized water flows into the toilet or urinal bowl. During this process, some of the water is forced to the upper chamber through a small bypass hole in the diaphragm until the pressure equalizes and pushes the diaphragm down onto the valve seat.   

With the Hybrid Flush by AMTC, a patented Ball Relief Valve (BRV) is used. Its innovative design is what allows for a true mechanical flush, which is the ability to flush a sensor flushometer manually even if batteries are drained or the sensor becomes damaged. During a manual flush, the BRV triggers the flush from the lower chamber, which tips the diaphragm and allows water into the lower chamber. 

Flush Valve


Touchless Flush Valves

An automatic flush valve is activated by infrared sensor technology. When the sensor is triggered, the solenoid opens and releases water for the upper chamber, which decreases the pressure and allows water into the lower chamber and through the tailpiece to the bowl. As with a manual flush valve, water is forced through the bypass hole in the diaphragm that equalizes pressure, pushing the diaphragm down onto the valve seat and completing the flush.

With the AMTC Sensor Hybrid Flush Valve, their patented micro-cam technology uses a gear-motor drive instead of a solenoid. This all-brass gear mechanism is proven to be more reliable and last longer than the traditional wet solenoid mechanism. The sensor triggers the gear motor drive that tips the BRV from the top, which releases pressure through the center of the BRV and allows water into the lower chamber to clear the bowl. At the same time, the upper chamber receives water until it equalizes, pushing the diaphragm down onto the valve seat and completing the flush.

Sensor Flush Valve Parts

Flush Valve Parts

Flush valves contain these standard parts:

  • Valve body: Attaches to the water supply and fixture (toilet or urinal)
  • Tailpiece: When water is released from the valve body, it travels through the tailpiece into the fixture bowl
  • Angle/screwdriver stop: Serves as the water shut off/on from the water supply through the wall 
  • Diaphragm/relief valve: Part of the mechanism in the valve body that controls the amount of water for the flush
  • Handle: On a manual flushometer, the handle is what triggers the diaphragm/relief valve for the flush
  • Sensor: What triggers the diaphragm/relief valve for the flush

Hands-Free Flush Valves from C&L Supply Company

C&L Supply Company offers commercial flush valves for toilets and urinals, including manual AMTC flush valves. We also provide waterless and standard urinals, drain trap products, hand dryers, soaps, and accessories for commercial restrooms. These products include touch-free, automatic options that further enhance hygiene in these facilities.

We are passionate about helping our clients find the solutions they need. Schedule a consultation or contact us for more information.