Just like globe valve ,lift check valve have narrow channel ,so pressure of fluid in lift check valve is bigger than swing check valve . swing check valve have fewer restrictions in flow rate.
Check valve with different materials can be used in pipe with various medium. Check valve become one of fluid parts of the complete pipeline when check valve is installed. The state of valve will be influenced by transient flow state of system it work .while, state of valve can affect transient flow state of system. And ball valve features:

1, open and close without friction. This feature is completely solve the traditional valve sealing surface due to impact of friction between the sealing problem.
2, the coat-style structure. On the valve installed in the pipe-line inspection and maintenance directly, can reduce plant parking and reduce costs.
3, single-seat design. Remove the valve in the cavity medium affect the use of abnormal pressure due to safety problems.

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