the valve before installation inspection should accord with the following requirements:

1) The power switch to trot, labeled properly;

2) No significant manufacturing oil plate appearance defects;

3) cavity inside should be clean, the valve surface and flange welding surface should be intact, no burrs, no all pipeline;

4) Actual operation organization and gear should be stipulated in the design scheme to carry out the inspection regulation, should pose to trot, labeled properly.

2, high pressure valves and transportation flammability, flammable and explosive, unique material such as harmful, harm of valve leak test should be 100%.

3, middle and bottom pressure valve needs from each ( With the manufacturer, with the specifications, the same) According to no less than 10% of the proportion to carry out the leak test; If didn't pass, 20% sampling inspection, as there are still no pass, then this batch valves cannot be used.

4, valves in rigor of pressure test methods and regulations should accord with the manufacturer's requirements. No request in factory, leak test pressure for 1 design working pressure. Is 25 times, and less valve in large allowable pressure 1 at 20 ℃. 1 times, such as valve factory brand logo in larger work pressure or valve wear mentioned in the actual operation of organization is not suitable for conducting leakage test, the test pressure should be factory brand logo of the larger valve working pressure difference of 1. 1 times, cut-off valve test, water should be introduced from the top of the piston valve; Should turn off the valve, cut-off valve experiments, on the surface to carry out the inspection.

5, valves and not less than the large diameter valves of DN600, instead can choose the spill or leakage pressure leak test

6, Industrial Valves hot metrological verification report by the manufacturer to produce, and should be carried out by qualified certificate of metrological verification enterprises valve hot setting value, and show the set values for the reasonable report.

7, valve leak test before, be sure to clear the plant oils such as architectural coatings on the surface of the weld neat and should check the sealing filler of the valve cover and valve seat, such as is not in conformity with the provisions should give conversion. sealing filler used shall comply with the regulation of our country standards

after 8, valve leak test standard; Renal tube water should be clear and tidy, make significant signs, port temporary plugging, and classified in store.

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