The installation size is small, and the driving torque is small, easy to operate, fast, and also has a good flow regulation function and close sealing characteristics, the mirror in the large and medium caliber, medium and low pressure use field, it is the dominant mirror form.

Usage: The mirror can be used in the chemical tower with high temperature, strong corrosion, easy poisoning, large danger and easy crystallization, so as to ensure its safe production.

Structure: The visual mirror is mainly composed of the mirror floor, the mirror glass, the valve assembly and so on. In the process of urea production, in the medium and low pressure tower with the mirror, due to the high operating temperature, strong liquid corrosion characteristics, easy to cause the liquid surface meter glass damage, visual mirror bottom plate deformation, and in the installation of mirror glass process, sometimes due to uneven force, easy to cause the mirror glass rupture. If not found in time, after driving is bound to leak, then the whole system must stop for hot wash replacement.

This not only brings difficulties to the long cycle safe operation of the system, but also seriously affects the efficiency of urea production. According to the urea production process "Liquid temperature affected easy crystallization" this characteristic, combined with all kinds of cut-off valve, insulation valve use characteristics, after a long period of observation, exploration and thinking, design the use of the mirror bottom plate for the valve body, on the bottom plate, the bottom of each additional valve for control, in the mirror floor to install the mirror glass level Around through the insulation steam insulation, in order to prevent liquid cooling crystallization to form a false liquid level. The bottom plate of the mirror is welded to the tower container, and the heat of the base plate is increased by the thermal of the tower body to further prevent the liquid crystallization. If the mirror leaks or mirror glass damage, you can first close the valve on the bottom plate, so that not only non-stop car can be replaced with the purpose of the mirror glass, but also to ensure the normal production, and the operator's personal safety and safety of the working environment is also guaranteed. After the Feicheng fertilizer plant in the urea pre-distillation tower test, a success, to fill the controllable insulation mirror field of the gap.