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Similarly, if the valve is closed when the solenoid is not energized, then the valve is termed normally closed (N.C.). [1] There are also 3-way and more complicated designs. [ 2 ] A 3-way valve has 3 ports; it connects one port to either of the two other ports (typically a supply port and an exhaust port).
A second type of system uses a thermostatically controlled pump which gets installed at the farthest fixture from the water heater. These thermostatically controlled pumps often have a built-in "normally closed" check-valve which prevents water in the cold water line from entering into the hot water line.
The controlled part of the injector is a solenoid-operated spill valve. Normally, it is open, allowing the fuel to return to the supply line when the pump plunger descends. When the solenoid is energized, the spill valve closes, and the fuel is forced through the spray tip into the cylinder. The four phases of EUI operation are: Fill phase
These valves have two ports that help the valves regulate the flow of air into a system. These valves often provide a simple on-off function. 3-way valves can be normally closed, normally open, and offer a universal function where gas can be diverted through a third opening to move the valve into the normally closed or normally open position ...
Normally closed valves are used to connect fluids and process components to other systems only when required. Vent and drain valves are examples of normally closed valves which are only opened when required to depressurise (vent) or drain fluids from a system. Isolation valves must effectively stop the passage of fluids. [4]
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