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1. Hydrostatic test into the valve, are not allowed to have cracks, pores, dents, stem adjustment may not have stuck phenomenon. 2. Use and spare bolts, nuts must be strength calculations and marked, to prevent confusion. 3. The test work piece must be fastened on the device, not allowed to freely place. haofm.com.q2GBV5vJ 4. Test rubber band, or other elastic pad, can not be uneven, delamination, loose or lose the phenomenon of elasticity. 5. Pressurization tests according to the product specifications shall not be allowed to tighten nuts, clamps and other components on the unit when the pressure is raised above the operating pressure. 6. End caps must comply with the provisions of technical documents, and passed the test before use, when the test pressure exceeds the calculated pressure of 25% are not allowed to use.