After the PVC transparent steel wire hose is produced, the general manufacturers need to carry out the relevant vacuum performance testing. This standard is about the experimental method and test method for the shape change of the inner and outer surfaces of the hose after the suction hose is evacuated to the specified negative pressure. There are two kinds, let's take a look at them together.
First of all, in terms of the length of the test hose, the minimum length, excluding its end hose joints, should be five times the nominal inner diameter of the hose, or 1 meter long. As far as these two data are concerned, you can choose the longer one. The length is a value. For some cases where the length is less than 1 meter, the whole hose or the hose assembly can be taken. For some hoses with an inner diameter of 80 mm and below, we generally need to lay the hose as flat as possible on a flat surface, and use a metal plug to block one end of the hose to prevent air leakage. , At this time, a solid ball is inserted into the hose, and then the open end of the hose needs to be connected to a vacuum pump with a vacuum gauge. Within 60 seconds, we need to reduce the internal pressure value of the hose to the specified experimental pressure value, And keep this value for at least 10 minutes. During the process of maintaining this test pressure, we can also check whether there is any depression on the outside of the transparent steel wire hose. Finally, we need to tilt the test hose so that the inner solid ball can be Pass the entire hose inside, and remember to check the hose for other faults.
