Air tightness and service time of electric butterfly valve
Impermeability is one of the important functions of the electric butterfly valve. Impermeability is the ability to block the passage of air under a certain pressure. The higher the air pressure, the better the anti gas function.
Not all electric butterfly valves that can form films have the function of gas storage, which is due to the hydrophilic groups contained in some macromolecular polymers.
Some polymer molecules contain hydrophilic groups. These hydrophilic groups have stronger affinity for water than the hydrogen bonding force between water molecules, so the gas storage function that can destroy the data of water classified polymer is poor. For example, the coating of polyvinyl acetate emulsion turns white after encountering water, which is the reason why water molecules penetrate into the polymer.
Shared time is the time from activation to failure. Before using the two-component, the two components need to be fully mixed and stirred evenly. The two components have necessary chemical reactions and eventually become cross-linked plane structure. Sharing time refers to the time from the onset of chemical reaction of components to the loss of construction function. Beyond this time, the construction becomes difficult, and various functional indicators of can not be effectively guaranteed.
The electric butterfly valve, especially the two-component response type electric butterfly valve, should be stirred evenly before construction. After the coating construction is completed, the two components will gradually cross link to form a film. Some solvents or gases cannot be completely discharged, which will gradually volatilize in the process of use, causing volume and size changes, which will produce strong internal stress. Under the effect of long-term internal stress, the data will accelerate aging Cracking and even loss of anti gas function. Heating expansion rate is a technical function index to measure the shape change of anti gas after being affected by heating.