Cast steel ball valve was born in the 1950s, with the rapid development of science and technology, the continuous improvement of production process and product structure, in a short time of 40 years, has rapidly developed into a major valve class. In the industrialized countries of Western countries, the use of ball valves is rising year by year, in China, ball valves are widely used in petroleum refining, long-distance pipeline, chemical industry, paper making, pharmaceutical, water conservancy, electric power, municipal, steel and other industries, plays a pivotal role in the national economy.

The working principle of the cast steel ball valve is to make the valve open or blocked by rotating the valve. Ball valve switch light, small size, can be made into a large caliber, reliable sealing, simple structure, easy maintenance, sealing surface and sphere are often in a closed state, not easy to be washed by the medium, in various industries have been widely used.

Ball valve and plug valve is the same type of valve, only its closing part is a ball, the ball around the middle line of the valve body for rotation to achieve the opening and closing of a valve.

Cast steel ball valve is a two-way valve, the flow direction is unlimited; The middle flange is connected with a stud, and the upper and lower valve stem are equipped with sliding bearings to reduce friction, save labor and smooth operation; Under normal circumstances: when the pressure is low, the valve seat sealing depends on the spring preload force to seal the valve seat close to the ball, when the pressure is high, the piston effect is formed on the valve seat, under the action of the upstream medium pressure, the valve seat compacting the ball to seal, cast steel ball valve is widely used in the process control system to achieve open or close.

Cast steel ball valve operation saves labor: the ball is supported by the upper and lower bearings, reducing friction, and removing excessive torque caused by the huge sealing load formed by the import pressure pushing the ball and the seal seat; The cast steel ball valve also has reliable sealing performance: PTFE monosexual material seal ring is embedded in the stainless steel seat, the metal seat end is equipped with a spring to ensure that the seal ring is sufficient preload, and the valve continues to ensure good sealing performance under the action of the spring when the sealing surface is worn during use.