Nozzle check valves
Nozzle check valves are designed with the disc connected to a central stem, moving along the horizontal axis. A spring is positioned between the disc and the diffuser sleeve. When flow enters the valve, the hydraulic force exerted onto the front face reacts against the spring, causing it to compress and allow the valve to open. When the flow stops, the spring forces the disc to return to the closed position.
Due to the spring-assisted closure and the short linear valve stroke, the nozzle check valve is one of the quickest acting check valves available and is commonly used in pumped systems where water hammer is a potential concern. The disc is constantly present in the flow stream which can result in slightly higher head loss compared to swing check valves.
For additional details please refer to our nozzle check valve product information.
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Factors to consider when choosing check valves?
Choosing the ideal check valve for your application depends on several selection criteria. No single type of check valve suits every situation, and the following factors are essential to consider. However, they may not be equally important for all applications. By evaluating these factors in relation to system requirements, you can select a check valve that ensures reliable performance, minimal maintenance and long-term operational efficiency.
Fluid compatibility
All check valves referred to in this article are designed for water and treated wastewater. However, for raw wastewater or sewage the presence of solids may impact valve performance, requiring careful consideration of design and material compatibility.
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Flow characteristics
Rapid closure of a check valve can protect upstream equipment such as pumps from damage. However, the rapid closure will not protect against the surges caused by pumps being started and shut down. If the valve opens (and closes) quickly, the flow will change rapidly and thus increase likeliness of surge occurrence. Consider the flow dynamics of your system to choose a valve that mitigates these risks effectively.
Head loss
Head loss is influenced by fluid velocity and valve design. Valves with unrestricted openings minimise head loss, whereas designs with narrower bores increase fluid velocity and, consequently, head loss. There are a number of values for head loss, among others zeta values, Kv and Kvs values.
Total cost of ownership
The total cost for your check valve is much more than the purchase price. Long-term costs such as maintenance, equipment protection and energy costs may be just as important as purchase price and installation costs.
A simple valve construction generally requires less maintenance, and the higher the Kv value, the lower the energy consumption.
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Non-slam characteristics
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