With through-hole plug, as the opening and closing the valve. The plug body with the valve stem rotation, in order to achieve the opening and closing movement. Small filler plug valves, also known as plug valves 
 "Hancock". Stopcock plug cone (cylinder) with the composition of the surface of the conical bore of the valve body seal pair. The plug valve is the valve of the first use of a simple structure, the switch quickly, the fluid resistance is small. Ordinary stopcock to rely on direct contact between the finishing of the metal plug body and the valve body to seal, so the poor sealing, opening and closing force, easy to wear, usually only for low (no higher than 1 MPa) and caliber (less than 100 mm) of occasions. 
 Ring the Yiu valve over the years has been the path of sustainable development and innovation to grow and develop. Central Yiu introduction of foreign advanced technology, lower costs, pay attention to quality, this is not just the needs of customers is the valve industry a must ring Yiu is a pioneer in the field. "Pioneers" of the ring Yiu active source of innovation. "Customer is God" is the spirit of enterprise, Central stunning self-improvement, courage and hard work and good team spirit of cooperation in industry, pave the way for future development. 
 Central Yiu valve products are widely used for urban construction, municipal, environmental protection, fire protection, electric power, metallurgy, petrochemical, chemical, gas, mining, food and other industries. Wholeheartedly with the domestic and foreign businesses win-win cooperation and common development, create brilliant! Ring Yiu for your dedicated service!