Abstract:When the contact type glue valve is used to spray protective film of the glue liquid, there are quality problems, like bubbles or vacuum packages in the protective film, and gas precipitated from glue in low pressure. Therefore, the solutions are put forward by designing a pressure feedback loop, changing the way of feeding, increasing the diameter of the rubber pipe and improving the working pressure of the valve and so on. A creative type of contact valve was designed. The application results show that the new contact valve has the characteristics of rapid and accurate glue control, good consistency and no bubble or vacuum package, which has wide application value.