The electric ball valve (PID regulating valve) has the features of high reliability and long service life. The valve adopts PTFE graphite ring and dual-EPDM stem seal ring to enhance the sealing of valve, equips unibody rectifier blade to adapt reverse pressure difference. The functions include equal percentage flow, high shutoff force 1.4Mpa, rated working pressure PN16, max. working pressure difference 0.35Mpa, manual actuator short circuit button, and -5°C to 121°C working temperature. The valve is applicable to water, steam or 50% water glycol.