Construction characteristics and installation method of electric shut-off valve
The imported electric shut-off valve is a valve that uses the valve stem to lift and move the valve head, thereby changing the distance between the valve disc and the valve seat to achieve the opening and closing control. The shut-off valve is the most widely used cut-off valve in chemical production. The shut-off valve is mainly used for the control of water, steam, compressed air and other pipelines in actual production, but it should not be applied to materials with high viscosity and easy crystallization. The main way to judge the opening and closing state of the valve during use is to observe the height of the valve stem exposed to the valve cover to control the operation of the valve. There may be gaps in the part of the stem that is connected to the bonnet, which is prone to media leakage, which can be solved by a packing seal.
With reference to the famous pressure relief valve brand Germany Lit LIT products, for the installation method of electric shut-off valve, Shenzhen Qiangang technicians believe that there are three main points:
1. The electric shut-off valve should be checked for leaks before opening to determine whether the valve has no leakage defects and whether the stuffing box has no leakage defects.
2. If the valve stem operation of the electric stop valve cannot be completed by hand, a special F-wrench can be used instead, but if the F-wrench still cannot be opened, do not use an extension wrench to open and close forcibly to avoid damage to the valve or even The occurrence of a security incident.
3. When the electric shut-off valve is applied to the medium-pressure steam line, the condensate should be removed before opening, and then the steam is preheated to the pipeline. The preheating pressure is maintained between 0.2 and 0.3 MPA. The purpose of this is to avoid Damage to the seal caused by sudden changes in temperature and pressure, and the pressure can be adjusted to the desired level after the state is stabilized.
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