The U.S. Type 564 three-way valve is available in either 1/4 in. (DN8) or 1/2 in. (DN15) sizes for modulating control of liquids, gases or steam in either mixing or diverting applications. The unit features one common port and two non-common ports. When used in a diverting application, the common port is piped as the valve inlet with flow proportionally controlled through the two outlet ports. When used in a mixing application, the common port is piped as the outlet with incoming fluid entering the two non-common ports. In this application, the inlet pressure to the two inlets should be the same. Each inner valve within the unit is connected by a common stem and is stroked simultaneously by the actuator. This action causes one orifice to open as the other is closing. The Cv, as well as the characteristics, of each inner valve, can be the same or of different values, depending on the requirements of the application.
The Type 564 valve is widely used in mixing applications such as temperature control; for example, when a cold fluid enters one of the non-common ports of the body and a hot fluid enters the other. By varying the position of the inner valve, the percentage of fluid passing through each inner valve can be controlled as it exits the common port. The same concept can be applied to the blending of various chemicals, dyes, additives, and other fluids or gases that must be proportionally mixed. The unit is also suited to diverting applications such as flow or pressure control in hydraulic systems. The hydraulic fluid enters the common port of the valve with one of the non-common ports controlling the flow to a cylinder or vessel with the unused fluid re-circulated back to the sump area through the other non-common port.
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