2. How to determine the number of pneumatic ball valves installed in the equipment: if the equipment manufacturer has provided this data, the manufacturer's regulations shall prevail; In general, the installation interval of pneumatic ball valve shall not exceed 2M, so the installation quantity of pneumatic ball valve can be calculated; If the equipment has a channel steel base and the strength of the base is strong enough, the installation interval of the pneumatic ball valve can be appropriately increased and the number of pneumatic ball valves can be appropriately reduced