The rectangular section of the plug valve can obtain an ideal flow regulation linearity as . the driving modes of the valve include electrically- pneumatically- or hydraulically-driven device to fulfill Its automatic control.

For example, the plug valve is applicable for pump discharge control valve, with the functions of preventing from reflow, knocking or regulating the water capacity.

When the pump starts, the valve opens gradually, the flow output is slowly increasing, which will not easily result in water hammering to destroy the facilities in the system. When the pump closes, the valve closes firstly, the pump stops, it provides sectional closing, the control valve keeps pace with the closing of the pump to prevent from reflow and water hammering arising. The water discharge capacity in the pipeline can be regulated according to the regulatory requirements by employing the flow regulating and closure function of the plug valve.