Comparison of linear and quarter-turn valves

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I feel that there are less than 9 shortcomings in straight stroke valves (up and down movement of the valve core) and angle stroke valves (rotary movement of the valve core), which are reflected in the following:: 　1. From the analysis of the flow path, the flow path of the straight stroke valve is complicated, resulting in four shortcomings: 　(1) Kv value is small ； 　(2) Poor blocking prevention ； 　(3) Large size and bulky ； 　(4) Poor appearance ； 　2. The valve stem of the straight stroke valve moves up and down, and the sliding friction is large, resulting in two shortcomings.: 　(1) The valve stem has poor sealing and short service life. ； 　(2) Poor vibration resistance ； 　3. Structural analysis leads to three shortcomings: 　(1) The allowable pressure difference of a single seal is small ； 　(2) Double seal leakage is large ； (3) The valve core is in the middle and cannot avoid direct erosion by high-speed media (cavitation, particles), and has a short service life. At present, most domestic chemical plants use more straight-stroke valves than angular-turn valves. Please give us your opinions on how to choose better valves! 　(3