The ZDHOT and ZDHOL series electric three-way converging and diverging control valves use a cylindrical thin-wall port-type valve plug for guidance. They are equipped with DKZ-type linear electric actuators and accept 0~10 or 4~20 mA DC signals to drive the valve opening and closing. Among them, the three-way converging control valve is used to mix two fluids into a third fluid, or to mix the same fluid at different temperatures into a fluid at a uniform temperature. The three-way diverging valve splits one fluid into two streams.

The nominal diameter of this series ranges from 25 mm to 300 mm, with nominal pressures of 1.6, 4.0, and 6.4 MPa. The applicable fluid temperature ranges from -60°C to 450°C. The control signal is 0~10 or 4~20 mA DC. The leakage standard is Class IV and Class VI. Flow characteristics include linear and parabolic. Depending on the bonnet used, they can be divided into standard type and heat dissipation type.