There are many different kinds of pumps used in water treatment applications. Each offers unique advantages in certain situations. For example, rotary and reciprocating pumps are the most common of the positive displacement water pumps, but they diverge when it comes to capabilities, performance, maintenance, and costs. The guide below explores the key differences between these two.

Rotary

A rotary pump functions by moving fluids between gears in a circular motion and carrying them to the discharge port. They are consistent by design, carrying a relatively constant volume per revolution. This results in a smooth, pulse-free flow rate. 

Most varieties are self-priming, meaning they can use stored liquid to generate a vacuum on their suction line. For this reason, they are useful for handling liquids carrying vapors. They can experience problems if these systems are run dry or if they are asked to process fluids containing abrasive solids.  

Rotary pumps may not last as long as other water pumps. They also produce loud periodic pulsations, so you may need to utilize system pressure dampening devices. However, they have a low initial cost, require minimal maintenance, and are easy to understand, which simplifies operations and repairs.

Reciprocating

These water pumps function by using a piston or diaphragm to alter the volume within a pressure chamber to move fluids. Reciprocating pumps are commonly used to deliver precise volumes in high-pressure applications—up to 40,000 psi. They are not quite as effective when used with excessively high volume flows, nor can they be used with fluids that change viscosity with temperature variations.

They tend to carry a high initial price tag and higher maintenance costs in exchange for their exactness. Using this type of pump will also require a discharge relief valve, a safety precaution that is programmed to open when the pump exceeds the required operating discharge pressure. You will also often need a pulsation dampener to ease the pulsed flow of injected chemicals, a pressurized supply tank for liquids with low vapor pressure, and an elevated reservoir.

If your company needs new water pumps, get in touch with Western Environmental Management for cutting-edge products and exceptional service. Since 1982, this water management specialist has provided various water treatment services to the industrial and manufacturing sector of New Mexico and El Paso, TX. They offer cost-effective equipment, as well as system inspections, cleaning, maintenance, and solutions to enhance your water management plan. Learn more about their services online. To discuss your company’s needs with a knowledgeable team member, call (575) 885-5709.