How does the Moen Flush Valve Work?
Question 1: Why doesn’t the Moen Commercial Manual Flush Valve System leak when not in use?
- Answer: While not in use, water pressure from the building/city, which is higher than atmospheric pressure, works to keep the force down on the piston, ensuring it stays closed and doesn’t leak.
Question 2: What happens when the Moen Commercial Manual Flush is activated?
- Answer: When the flush is activated, either by the sensor opening the solenoid or by pushing the manual override, the top chamber’s pressure drops to low until the solenoid or override closes. This imbalance of force lifts the piston, allowing high-pressure water to run through the valve to the bowl.
Question 3: How does the Moen Commercial Manual Flush Valve System control the flow of water during the flush?
- Answer: During the flush, water flows to the bowl while also slowly flowing through the set screw orifice. As the top chamber refills, it exerts pressure on the top of the piston, changing the imbalance of force and starting to push the piston down until it closes. The time it takes for the piston to drop is determined by the size of the orifice.
Question 4: What maintains the balance of pressure in the Moen Commercial Manual Flush Valve System when not in use?
- Answer: The balance of pressure in the valve when not in use is maintained by a small orifice (set screw) between the top and bottom chambers, which equalizes the pressure.
Question 5: How is the duration of the Moen Commercial Manual Flush Valve System determined?
- Answer: The duration of the flush is determined by the size of the orifice through which water slowly flows. As the top chamber refills and exerts pressure on the piston, the imbalance of force changes, causing the piston to start pushing down until it closes, with the time taken influenced by the orifice size.
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