Soft seat drastically reduces reverse flow leakage and aids the quiet closing of the valve. Soft seat - All nozzle check valves from DFT ® feature soft seat, a specially designed and sourced O-ring installed in the seat of the valve.Disc design - The disc faces for all of our nozzle check valves are designed to maximize hydrodynamic efficiency and minimize pressure loss.Body diameter - We have found that nozzle check valves with bodies notably larger in diameter than their inlets display the best flow characteristics.Our valves, which we constantly work to improve, are efficient and reliable.īoth internally and externally, DFT ® nozzle check valves feature a number of key differences than those of our competitors: Using a state-of-the-art design and test simulation software, DFT ® offers a broad range of nozzle check valve options. For mixing processes that require components to remain at precise percentages, such as ethanol-additive blending, backflow protection is extremely important. In these scenarios, nozzle check valves have proven highly effective at stopping backflow while providing tight shut off performance. Nozzle check valves have distinguished themselves particularly well in chemical and petroleum processing plants. They are as essential for reducing water hammer in residential plumbing systems as they are for preventing backflow in heavy industrial applications, such as chemical processing, cooling towers, mine dewatering, and many more applications. Zero leakage performance when compared to other check valve typesīy their nature, nozzle check valves are useful in a large variety of scenarios and settings.Protection for pumping and rotating equipment from reversed flows.Elimination of valve chatter in low flow conditions.Minimization or elimination of water hammer, and its damaging effects.Quick and dynamic responses to changes in flow pressure and velocity.When the fluid flow slows or stops, the spring automatically closes the valve.īecause of its unique nature, this type of valve offers a number of benefits: When the pressure of the fluid, gas, or slurry against the disc at the inlet overpowers the closing force of the spring, the spring compresses and the fluid, gas, or slurry flows freely. In nozzle check valves, the shutoff mechanism is a disc, which is held against the seat by an internal spring. In particular, they are meant to close quickly and quietly during low pressure and no-flow periods, and can be used to reliably prevent the liquid, gas, or slurry from flowing in the reverse direction. Nozzle check valves are designed specifically for scenarios in which a fluid, gas, or slurry is pumped in a low pressure or otherwise intermittent flow.
We offer a diverse line of reliable check valves, including a family of nozzle check valves that are an ideal backflow protection solution for virtually any application. There are innumerable fast-reversing fluid flow applications that require protection against surges or backflow, including axial flow scenarios.ĭFT ® has been a world renowned manufacturer of in-line “non-slam” check valves since 1943.