Compress the pre tensioned spring to make the valve seat separate from the spherical surface to form a relief channel, so as to ensure that the pressure in the middle chamber can be smoothly discharged into the pipeline, avoiding the potential safety hazard caused by the abnormal pressure rise in the middle chamber. The self discharging valve seat can be used for media in any state, without abnormal pressure rise caused by chemical change or phase change of unstable media in the valve chamber. Because only one valve seat plays a sealing role during normal operation, the operating torque of the valve is relatively low. This structure has mature technology and simple manufacturing. Since only the upstream valve seat plays a sealing role for the self draining valve seat, the sealing performance of the valve will be affected when the upstream valve seat is damaged. At this time, the installation direction of the valve must be turned 180 degrees before continuing to use.

Let's talk about what stainless steel pneumatic butterfly valves are selected according to:
Stainless steel pneumatic butterfly valve shall be selected according to the following conditions
size
Stainless steel pneumatic butterfly valve nominal diameter, joint type and size, hose length. pressure
The practical working pressure of stainless steel pneumatic butterfly valve is the nominal pressure PN/working pressure P. medium
The chemical properties of the medium recommended in the stainless steel pneumatic butterfly valve shall determine the material of each part of the hose according to the corrosion resistance table.
temperature
Operating temperature and range of medium in stainless steel pneumatic butterfly valve; Ambient temperature of stainless steel hose during operation. In case of high temperature, the maximum allowable pressure under the working temperature must be confirmed according to the temperature correction coefficient to ensure the correct pressure level is selected. state
According to the state of stainless steel pneumatic butterfly valve when it is used, and referring to the correct installation mode of hose, the length calculation of various motion states of hose, the minimum bending radius of hose and other factors, the length of hose shall be correctly selected and correctly installed.
Failure analysis of thin-walled stainless steel pneumatic butterfly valve
At present, with the rapid development of science and technology, thin-walled stainless steel pneumatic butterfly valves are more and more widely used in aerospace, aviation, metallurgy, steel, construction, and textile fields.
As a flexible connection element in various pipeline projects, pneumatic butterfly valve has the characteristics of light weight, small size, corrosion resistance, high temperature resistance, high pressure bearing, vibration absorption, and compensation for large displacement deflection in the pipeline. In order to ensure the normal operation of the pipeline, it is necessary to avoid the failure of the pneumatic butterfly valve of the vulnerable flexible element.