RV Q641F flanged pneumatic ball valve is a specially designed and carefully manufactured product on the basis of introducing foreign advanced technology. Through intelligent control and positioning, the product matches with Siemens electro pneumatic valve or home-made electro pneumatic valve positioner and can control operation through inputting 4-20m ADC SINGAL AND 0.4-0.7MPa gas source to realize adjustment of pressure, flow, temperature, liquid level ,etc. The product is powered by compressed air. valve rod drives valve plug rotate 90° in valve body to realize full Opening and full closing. The product features compact structure, small volume, high operating reliability, good sealing performance, easy maintenance, convenient installation and high adaptability, etc. The product is especially suitable for sticky and particle and fiber-contained medium. The product is widely applied in automatic control system as remote centralized control or local control in petroleum industry. chemical industry teaching appliances, light industry, high pressure equipment pharmaceutical industry, paper-making industry, etc.