Check Valve Good Sealing, Fluid Resistance
Nov 22, 2017
Check valve in a lot of work at the same time, its product quality is very important. So that the normal operation of the check valve is the guarantee of continuous work, if the leisure time through a variety of test methods for the quality of the check valve to achieve the purpose of safe work. So how does the check valve detect?
We generally divide the easiest way to check the check valve into three steps:
First, open the check valve access, water (or kerosene) filled the valve chamber, and boost to the strength test requirements of the pressure, check the valve body, bonnet, gasket, filler with or without leakage.
Second, off the dead valve, in the side of the check valve to the nominal pressure, from the other side to check whether the leakage.
Third, the check valve will be reversed, the opposite side of the test. Through the above three simple steps can be analyzed to check the basic working state of the check valve is abnormal.
Of course, there are more complex test methods, the following method is pointed out that the more complex for the potential problems, the basic steps can be divided into two steps:
First, the check valve test pressure Nominal pressure from 0.4Mpa-32Mpa, these commonly used pressure valve, the valve strength test pressure for its nominal pressure of 1.5 times. Valve seal test pressure, equal to 1.1 times the nominal pressure.
Second, the check valve test bench usually has a compression part above, there is a connection with the test pump connected to the pipeline. The valve will be pressed, the test pump work, from the pressure test pump on the pressure gauge, you can read the pressure to withstand the valve number. Electric valve test pressure water, the valve to the air drained. The upper platen of the test bench has an exhaust hole and is opened and closed with a small valve. The sign of the air is that all the ones out of the vent are water. Close the vent and start boosting. The step-up process should be slow, do not be sharp. To achieve the required pressure, to maintain 3 minutes, the pressure does not change to qualified.