How a hand pump works

I am try to explain water hand pump functions as per my vision. hope you like it. Thank you. Hand pumps are manually operated pumps; they use human power and mechanical advantage to move fluids or air from one place to another. They are widely used in every country in the world for a variety of industrial, marine, irrigation and leisure activities. There are many different types of hand pump available, mainly operating on a piston, diaphragm or rotary vane principle with a check valve on the entry and exit ports to the chamber operating in opposing directions. Most hand pumps are either piston pumps or plunger pumps Thank you For Sound- chill. by sakura Hz | Music promoted by Creative Commons Attribution 3.0 Unported License