10 FEBRUARY 2023 WorldWide Drilling Resource® Installing Submersible Check Valves - When, Where, and Why Part 2 Adapted from Information by Laura Jensen, Flomatic Valves Properly designing and planning systems is vital when determining pump size, along with pump depth, drop pipe diameter, piping elbows, and the number of check valves. When selecting the proper submersible check valves, it is important to ensure the valves are sized properly and according to pipe flow velocities. The sizing of valves is imperative and can be overlooked when installing submersible check valves or selecting the sizing of a valve based on friction loss rather than system flow. When a pump system is not properly designed, there are several potential issues and concerns associated with it - a shorter life span for the system, as well as higher costs and maintenance expenses in the long-term. Multiple submersible check valves also provide a smooth application. Potential issues include: Backspin: Backspin happens when water flows backward through the pump causing the pump impellers to spin in the reverse direction from its intended use. Upthrust: Upthrust occurs when the pump turns on in a low head condition which results in an uplifting action on the impeller shaft assembly. Water hammer: Water hammer is the result of a pressure surge or a high-pressure shock wave. When water is pumped through a piping system, it has a certain amount of energy. If the pumping is stopped, the water continues to move and its remaining energy must be absorbed in some way. This absorption of energy can sometimes create a clunking, thumping, and banging noise and/or damage called water hammer or hydraulic shock. Water hammer can destroy pipes, valves, and other equipment. There are several reasons to use multiple check valves. With regard to flow and maximum system pressures, there are many different types of submersible check valves to consider for different applications. Material, size, and construction all make a significant difference in performance and are important to consider for years of trouble-free operation. Nearly all well-known pump manufacturers recommend the installation of multiple check valves in water well systems - thus acknowledging the placement of check valves at multiple stages along the drop pump is the best way to protect their product and increase longevity. When working on submersible applications, it is imperative to hire and work with knowledgeable, experienced contractors and professionals in the industry. It is key to partner with industry professionals who realize the value and significance of the installation of multiple submersible check valves and follow the recommendations. The VFD (variable flow demands) check valve is engineered to allow the valve to operate in a wide range of flows. WTR The DI (ductile iron) series of valves features a doubleguided ductile iron poppet for vertical and horizontal applications. 80DIVFD 80DIX
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