Multi-function solenoid valve with automatic reflux

Multifunctional in one, one is due to engineering needs solenoid valve installed under the manhole or suspended pipeline emergency power failure can not open the solenoid valve. This product invented a manual pull-wire device, by manual pressure relief discharge diaphragm above the pressure to open the solenoid valve to the pipeline. Secondly, it also invented and designed a two-position three-way automatic reflux function, after the solenoid valve is closed, the residual medium in the pipeline at the outlet end will be emptied to ensure the quality of the medium in the pipeline for secondary use and drinking standards.