2、 Electric on-off butterfly valve is applicable to a wide range of applications, but not all of them can be used. Electric on-off butterfly valve can only be used for flow control. In addition, the ability to open and close the electric butterfly valve should also be considered when using, because the electric butterfly valve is easy to wear out when working, and the external pressure and environment will affect the service life of the electric butterfly valve. Therefore, the specification and size of the electric on-off butterfly valve shall be determined according to the regulating flow. 　　

The linkage test shall focus on the following points:
(1) Before the linkage test, the process pipeline must be strictly purged and qualified. The unqualified pipeline must not be installed, because the residues in the pipeline, such as welding slag, dust and other hard debris, will damage the sealing surface of the valve core and valve seat.
(2) Before linkage, it shall be checked that both ends of the valve shall not be equipped with pressure test or blocking blind plates.
(3) If there is a handwheel mechanism, the handwheel mechanism should be in the "release" position. Check whether the air supply pressure meets the air supply requirements. 7 Conclusion During the installation of industrial automation instruments, the installation and operation are the most complicated, difficult and prone to problems. In the whole process, the instrument discipline and the pipeline discipline should coordinate, support and cooperate closely with each other, reflect and solve problems in time, and operate strictly according to the requirements and procedures. Only in this way can the installation quality and operation quality be smoothly guaranteed to ensure the smooth progress of the entire installation project and the smooth operation of the entire industrial plant.