OCV: Established in 1952 in the city of Tulsa in the state of Oklahoma, USA, specializes in manufacturing top quality control valves in the world with product lines such as: Electronic Control Valve, Pressure Reducing/Regulator Valve, Pressure Relief Valve, Deluge Valve, Rate of Flow Valve, Differential Control Valve, Digital Preset Valve, Float Control Valve, Power Actuated Valve, Pump Control Valve, Solenoid Control Valve, Check Valve, Surge Application Valve,…... are widely applied in fields such as: Water works, aviation fuel, fire protection, mining, commercial water supply systems, terminal services, ...