How to make teaching easy to use piston pump (method 2) (with photos)

Production methods】 【Piston rod used bicycle spokes, spoke with threaded end of the piston. The upper end of the piston rod welded a bar as a handle. Piston use rubber, the connection method shown in Figure 5.16-8. Pumps made of glass or cylindrical shampoo bottle made of (Figure 5.16-9). One of the valve inlet valve by the thin rubber part of the paste in the middle has been made of perforated rubber stopper; the adhesive surface is not greater than 1/5 of the rubber area. The size of the thin rubber should be smaller than the rubber stopper, but the movable part should be sufficient to shield the inlet. Effluent valve by the piston on behalf of both. Insert a straight glass tube into the plug-in hole in the inlet valve as the inlet tube. Pumping the upper part of the sidewall punch, insert a bend, as the outlet pipe. [Usage] First through the piston rod will be plug in the pump hole has been perforated rubber stopper, and then control the Figure 5.16-8 installed pistons. Punch the piston into the pump from the pump opening and plug the stopper. Will stick the water inlet valve stopper (with inlet pipe) tightly into the lower end of the pump, wax seal. Finally, the inlet pipe into the water tank has been installed. Hand pump, you can hand pumping demonstration. As long as the seal is good, the teaching aids not only for pumping but also for pumping. This simply seals the inlet pipe in the container from which the air is to be drawn off. Pumping and pumping methods are the same as conventional piston pumps and aspirators.

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