Empty pipe detection of fluorine lined pneumatic wafer type fluorine lined butterfly valve 2. The residual stress analysis of the weld is as mentioned above. The residual stress of welding is caused by the uneven temperature field on the weldment during welding. The temperature of the weld and its surrounding area rises sharply, and the uneven expansion caused by the uneven temperature field results in the residual stress of welding. However, the welded joint of the full welded valve body is a typical thick wall multi-layer weld. The welding heat affected zone has experienced repeated heating and cooling, resulting in coarse grain structure in this area, which constitutes a weak toughness zone of the welded joint.
Problems to be paid attention to in the selection and purchase of plastic coated pneumatic butterfly valve
In terms of transmission lines used in many industries, some good protection data should be well used externally, so that we can understand this plastic coated pneumatic butterfly valve product. This pipeline equipment product has a good application effect. The whole product uses metal inner pipes, which can ensure the strength of the whole pipeline, In addition, PVC materials are sprayed on the outside of the pipeline, which better improves the service life of the entire pipeline.
As for the purchase of the plastic coated pneumatic butterfly valve, the specification and size of the hose should be well understood, so as to ensure that the device can be used more accurately, and that there will be no more gaps and other problems when it is used. In addition, the quality of the PVC materials sprayed on the outside of the entire equipment, In this way, it is better to ensure that there will be no more leakage and corrosion problems during operation.
Therefore, when purchasing this plastic coated pneumatic butterfly valve, it is necessary to more control the characteristics of the above aspects, so as to better help people get more practical assistance from it. If a high-quality protective and safe pipeline is selected, it can better guarantee the normal operation of many key and important equipment, Therefore, you should carefully understand the characteristics and parameters of the purchase.
