Principle of three-way valve
The three-way valve body has three ports, one inlet and two outlets (left inlet, right and bottom outlet). The difference from ordinary valves is that there is an outlet at the bottom. When the internal valve core is in different positions, the outlet is different, such as the valve core at the bottom. When the valve core is in the upper part, the right outlet is blocked, and the left and lower ports are connected. Because the left and right mouths are not on the same horizontal line. When the high-pressure heater is unloaded in an emergency, the valve is closed and the water supply is bypassed.
The three-way valve is divided into a merging valve and a diverging valve according to the way of fluid action. The merging valve has two inlets and flows out from one outlet after merging. The diverter valve has a fluid inlet, which flows out from two fluid outlets after being diverted.
The most obvious difference in appearance between a three-way valve and an ordinary valve is one more flow passage.
The three-way valve is mainly used to change the flow direction of the medium, so in addition to the inlet A, the outlet B, and the reversing port C, ordinary valves do not have the function of changing the flow direction of the medium. During its working process, the valve opens and the medium enters the valve from A and flows out of the valve through B. When the bypass requires medium to flow in, the actuator turns 90°, the valve core changes direction, and medium A enters C out. When the pipeline does not require medium to flow in, The actuator rotates another 90°, the valve closes and cuts off the medium.