Check valve test method and inspection rules for a General 
   If the contract does not stipulate in the order of other additional inspection requirements, the buyer of the test content be limited to:
    a) use of non-destructive testing method, in the assembly process to test on the valve;
    b) Review of "processing record" and "non-destructive inspection records";
    c) pressure test.
2 Check valve test method
2.1 pressure test
2.1.1 valve pilot projects, test medium, test pressure, test duration and test methods, as requested by JB / T 9092-1999 requirements.
2.1.2 shell test, the test pressure of the shortest duration, the valve body and valve cover all parts of the junction, there is no visible leakage.
2.1.3 Sealing test, the test pressure of the shortest duration, the maximum allowable leakage through the valve seat leakage rate should be consistent with JB / T 9092-1999 requirements. The duration of the seal test process, set the back of the seat ring and disc itself should be no visible leakage.
2.2 The valve body wall thickness measurement
    With a thickness or caliper gauge measuring body dedicated channel, in the chamber and the valve cover parts of the wall thickness.
2.3 sealing surface hardness measurement
    Sealing surface with a hardness in the central area, measuring three-point averaging.
2.4 Connect the body and the valve cover stud hardness measurement
    The valve body and valve cover to connect the two ends of cars stud flat, with hardness measured in the two ends of the three, taking the average.
2.5 Body, bonnet and disc material chemical composition analysis
    In the valve body, valve cover and valve sampling valve body materials, cuttings and surface samples should be 6.5 mm in the following office. The results should meet the relevant material standards.
2.6 Check Valve Logo
    Visual body marking the surface of cast or the content.
2.7 nameplate content inspection
    Valve nameplate marking visual content.
3 Check Valve Inspection Rules
3.1 Each valve must be shipped by Taiwan to test, test before they can be manufactured.
3.2 The test items, technical requirements and test methods in accordance with the provisions of Table 7.