Thermostatic expansion valve of cooling-water machine

The thermostatic expansion valve comprises a protective shell, a thermostatic expansion valve body is arranged in an inner cavity of the protective shell, the two sides of the thermostatic expansion valve body are communicated with connecting pipes, the outer sides of the connecting pipes penetrate through the protective shell and extend to the outside, and an installation plate is fixedly installed on the back face of the protective shell. First mounting holes are formed in the upper side and the lower side of the front face of the mounting plate correspondingly, a bottom plate is arranged at the bottom of the protection shell, and second mounting holes are formed in the front side and the rear side of the top of the bottom plate correspondingly. The thermostatic expansion valve body is protected through the protective shell, the thermostatic expansion valve body is prevented from being directly exposed outside and damaged due to collision, the device can be fixed to a designated place through cooperation of