Pneumatic ball valves have been widely used in petroleum, chemical industry, power generation, paper making, atomic energy, aviation, rocket and other departments, as well as in people's daily life. Today, I'd like to share with you my knowledge of pneumatic ball valves!

Different views on fatigue life of compensator design for hot water and steam pipelines
The urban central heating pipe network is divided into hot water and steam by cut-off. The medium of the hot water pipe network overflows the pipeline all year round. During the heating period, the pipeline temperature rises and rises slowly. During the operation phase, the pressure and temperature changes slightly. The contraction joints bear pressure, and the displacement action is smooth and relaxed,
The steam pipe network is characterized by high gas flow rate, fast temperature rise, liquid accumulation formed when cold and temperature drop, and the opening and closing meetings of valves have a great impact on the contraction joints. In particular, the external pressure contraction joints thinned by the single-layer wall thickness of the bellows are prone to failure caused by the impact of pressure changes of residual liquid heating and evaporation. At the same time, the frequency and range of temperature fluctuations during the operation of the steam pipe network are higher than