To investigate the diffluence ratio and internal flow characteristics of a three-way control valve, the SIMPLE algorithm was used to simulate the internal flow field by using the standard k-ε turbulence model. By changing the inlet flow rate and the rotational angle of valve core, the internal flow characteristics and the diffluence ratio variation laws were studied. The simulated and experimental results are in good agreement each other. The results show that the valve can shunt effectively when the rotational angle varies from 15° to 75°. With increasing angle, the horizontal diffluence ratio increases at first to 0.55 at 35°, then decreases to 0.40 at 55°, finally keeps increasing to 1.00. This variation tendency agrees with the change in the ratio of the horizontal outflow area to the total outflow area. With increasing angle, the inlet pressure increases firstly and then decreases but reaches the peak at about 45°, the pressure curves are generally symmetrical about 45° line. This change tendency is consistent with the entrance flow area of the regulating part. The flow area contracts in the connection part between the inlet and the core, and the throttling leads to the highest flow velocity there and the highest pressure at the entrance.
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