... , sewage, oil liquid, air, gas, natural gas andwater vapor, and other media to cut-off or adjust flow control. 1) On ... -off type: Match with 2/5way solenoid valve, 2/3way solenoid valve realize switch control; 2) ... Regulated type: With electric locator, input 4 – 20mA realize flow regulating control Polovo valves (Shanghai) ...