1. External pressure pneumatic ball valve External pressure pneumatic ball valve mainly absorbs axial displacement, with the advantages of large compensation, good insulation performance, and residual media can be eliminated.
2. Internal pressure pneumatic ball valve The internal pressure pneumatic ball valve is mainly used to compensate the axial displacement, and can also compensate the transverse displacement or the axial and transverse combined displacement. It has the ability to compensate the angular displacement, but it is generally not used to compensate the angular displacement.
3. The difference between internal pressure and external pressure pneumatic ball valves is that internal pressure pneumatic ball valves and external pressure pneumatic ball valves can be mainly used in the heating pipeline system. The main difference between the two types is that the external protective sleeve can be cut when using the internal pressure type to observe the situation; The external pressure type is excellent and cannot be cut. If the working steel pipe is opened, the medium will leak. During installation, special care shall be taken to prevent any damage to the thin pneumatic ball valve.
The installation shall be carried out according to the appropriate length recommended by the manufacturer, unless the installation tolerance has been specified by the system designer or proposed by the pneumatic ball valve manufacturer in advance. The use of internal pneumatic ball valve and external pneumatic ball valve in the heat supply pipeline can be mainly used in the heat supply pipeline system. The main difference between the two is that the external protective sleeve can be cut open when the internal pressure type is used to observe the situation; The external pressure type is excellent and cannot be cut. If the working steel pipe is opened, the medium will leak. During installation, special care shall be taken to prevent any damage to the thin pneumatic ball valve. The installation shall be carried out according to the appropriate length recommended by the manufacturer, unless the installation tolerance has been specified by the system designer or proposed by the pneumatic ball valve manufacturer in advance.
However, many people are afraid of making mistakes. Before the pneumatic ball valve leaves the factory, it has been pre stretched or compressed, or a large margin has been left. The construction unit is not required to operate on site. For details, please refer to the manufacturer's requirements. However, before use, it must be clear whether it is internal pressure or external pressure. There is an essential difference between the two, and the use is different. The internal pressure type outer protective sleeve can be cut and observed; The external pressure type is excellent and cannot be cut. If cutting is equal to opening the working steel pipe, it will cause medium leakage, so it must be remembered.