Flush valves for toilets, slop hoppers and sluice sinks

Toilets, slop hoppers and sluice sinks all use the same type of flush valves.  The main difference in selecting a model will be the water pressure and flow rate.  Most valves will operate between 30 kPa and 600 kPa (0.3 bar to 6 bar). The inlet of the flush valve is also important, high volume low pressure units have 25 mm inlets and high pressure high volume flush valves have 20 mm inlets.  The outlet of the flush valve is always the same at 38 mm (internal diameter, so the male pipe must be 38 mm outer diameter).

Important features to consider when selecting a flush valve

As been said previously, not all flush valves are the same. So when selecting unit for your industrial toilet, slop hopper and sluice sink you have to take the following into consideration:

• What is your water pressure, especially the minimum and maximum during a 24 hour period. If your water pressure is higher than 6 bar during the night you will have to install a pressure reducing valve or pressure regulator.
• What is the flow rate of the water at lowest water pressure during a 24 hour period.
• What is the diameter of the outlet or water supply in the wall (not so important but if you have tiled then it is something to consider)
• Is aesthetics important (only applicable with toilets in commercial settings like shopping malls, hospitals and clinics).

Different types of flush valves for toilets, slop hoppers and sluice sinks

The table below provides the basic combinations of flush valves that can be used with each system.