Blood passes through a valve as it leaves each chamber of the heart. The valves prevent the backward flow of blood. They act as one-way inlets of blood on one side of a ventricle and one-way outlets ...

to protect the valve body and fixing wooden cases is the final step. 1. Inner packing: opp bag, then carton box for each product. 2. Outer packing: export standard carton, Foam outside protecting the ...