Question

Neethu had seen people were taking water from the hand pumps. She wanted to know how it works. How would you apply your knowledge to make her understand?

Answer 1

The principle of hand pump is creating low pressure to suck the underground water. Two or more non return valves are attached at both the opposite sides of piston of pump. The function of non return valve is to allow the water to pass through it from one side only so water can suck in but cannot fall back to ground. ,

Answer 2

How does a hand water pump work? The old fashioned “pitcher pump” had a handle, rod with a bucket piston on the bottom, barrel, casing, and check valve. Each stroke down on the handle pulled the rod upward in the barrel, which drew water up past the check valve. When the rod was raise, the bucket piston’s “leathers” allowed more water above them by compressing slightly away from the barrel, and this water was pushed upward and out the spout. This setup will lift water from about 30 feet.

Other hand operated water pumps use a diaphragm to suck in and then discharge water, and can be more efficient than pitcher pumps. The principal of the diaphragm sucking in water is similar to the pitcher pump, in that it draws in water and then pushes it out in the opposite direction.