Manual/electric soft seal butterfly valve instruction manual/electric soft seal butterfly valve is applicable to pipelines with water, sea water or oil as the medium. It is mainly used as a stop valve to cut off the medium in order to protect the pipeline system. Manual/electric soft seal butterfly valve is mainly composed of butterfly valve body, manual device or electric device

How to change the pneumatic butterfly valve in operation
It has been found after previous earthquakes abroad that in earthquakes, the storage tank and the pipeline connected to it experienced absolute displacement, resulting in great stress, which made the pipeline and the connected equipment, pipe fittings, fixed supports and other places subject to excessive force and torque. In serious cases, the tank body could be damaged, and a storage liquid leakage accident could occur. In order to increase the stress, the pipeline system must be designed to be flexible enough to overcome the above destruction. The pneumatic butterfly valve has enough flexibility, which can reduce the stress in the pipeline, increase the thrust of the pipeline on the tank and support, and thus maintain the tank.
1. If the steel is assumed to be temporarily hot and cold alternating tasks, then under the thermal stress caused by the temperature difference change outside the data, large cracks will occur and expand from time to time, initially leading to unity. Therefore, the thermal fatigue function of steel should be considered for the structure and pipeline under the task condition of rough temperature change.
2. Under the action of low temperature, the cementite in carbon steel will migrate and gather due to the energy obtained, and form the cementite with coarse grains and inclusion in ferrite. The cementite will gradually change from lamellar to spherical, which is called spheroidization. Due to the extremely low strength of graphite and its flaky appearance, the strength of materials is greatly reduced, and brittleness is added, which is called graphitization of materials. The carbon steel will be graphitized in the environment above 425 ℃ for the time being, which is more obvious when the temperature is higher than 475 ℃. The maximum operating temperature of SH3059 regular carbon steel is 425 ℃, and the maximum operating temperature of GB150 regular carbon steel is 450 ℃.