The regulating valve is used to regulate the flow, pressure and liquid level of the medium. According to the signal of the adjustment position, the opening of the valve is automatically controlled to achieve the adjustment of the medium flow, pressure and liquid level. The regulating valve is divided into electric regulating valve, pneumatic regulating valve and hydraulic regulating valve.

The regulating valve consists of two parts: electric actuator or pneumatic actuator and regulating valve. Regulating valves are usually divided into two types, straight-through single-seat regulating valve and straight-through double-seat regulating valve. The latter has the characteristics of large flow capacity, small imbalance and stable operation, so it is usually especially suitable for large flow, high pressure drop and leakage. Few occasions.