Valve shell experiment is the valve body and the valve cover made of the entire valve housing pressure test. Its purpose is to check the tightness of the valve body and bonnet and the pressure resistance of the entire housing, including the connection of the valve body to the bonnet. Each valve should be factory tested before leaving the factory. Do not paint the valve or use other leak-proof coatings prior to shell testing. However, chemical-free rust-proofing and lining valve linings are permitted. If the user checks the inventory valve, no longer removes the existing coating. In the process of pressure test, the valve shall not exert any influence on the test results. Test pressure should be maintained during packing and testing. When experimenting with liquid, the gas inside the body cavity of the valve should be excluded. After the dwell time is reached, the housing (including the packing and the connection between the valve body and bonnet) shall not leak or cause structural damage. Shell test methods and steps: closing the valve inlet and outlet, compaction packing gland, the opening and closing pieces in a partially open position; to the body cavity filled with test medium, and gradually pressurized to the test pressure; after a specified time, check the shell Is the body infiltrated?

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