RVQ641F ultra-short 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 positioned or home-made electro pneumatic valve positioned and can control operation through inputting 4-20m ADC signal 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 o rotate 90°in valve body to realize full opening and full closing. The product is divided into metallic seal and soft seal by its sealing performance. The product features compact structure, small volume ,high operating reliability, good sealing performance, 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 to foodstuff industry, environmental protection industry, water treatment industry, light industry, petro chemical industry, paper-marking industry, etc.