chemical pumps are common in our life
The most commonly used chemical injection pump for individual water treatment is the positive displacement diaphragm pump. These pumps are equipped with: an electric motor, a piston, a diaphragm, a suction and injection valve, a chemical holding tank, and a foot valve. The motor first withdraws the piston to pull back the diaphragm. This creates a vacuum in the chamber that opens the suction valve, drawing in the chemical. The motor then drives the piston to push on the diaphragm. This forces the chemical out of the chamber, through the injection valve, and into the water line.
Maintenance of the injection pump is crucial to its reliable operation. The motor and piston must be lubricated. Because of the corrosive nature of the concentrated chlorine solutions, the valves wear out and have to be replaced. Chlorine storage containers must also be corrosion resistant and kept out of the light. The chemical tank also needs to be checked and kept full, and occasionally cleaned if chlorine solutions are prepared with powdered hypochlorite (sediment tends to accumulate in storage containers). Advantages of this type of injection pump are its ability to deliver chemicals over a wide range of injection rates and ease of adjustment.
Other types of chlorinators add chlorine tablets to the water supply, often at the well. They are called erosion and pellet chlorinators.
Erosion chlorinators consist of a canister to hold a supply of chlorine tablets and a chamber to allow water to flow over and dissolve the tablets. These units have the advantage of using chlorine tablets that are easy to handle and store. However, the chlorine dose they deliver tends to fluctuate greatly and is difficult to control. Tablet bridging can occur when the tablets get damp in the storage canister and stick together. Taping the storage canister occasionally can help break down the bridging that occurs.
More products of pumps
Pneumatic and electric diaphragm pumps
2012-05-17
