Knife Valves allow you to tightly close off the water lines of the connected piping to allow for maintenance on joined mechanisms such as pumps or filters without shutting down your pond.
Gate valves (also known as knife valves or slide valves) are linear motion valves in which a flat closure element slides into the flow stream to provide shut-off. Gate valves and knife valves are designed to minimize pressure drop across the valve in the fully opened position and stop the flow of fluid completely.
The direction of fluid flow does not change, and the diameter through which the process fluid passes is essentially equal to that of the pipe. Hence, they tend to have minimal pressure drop when opened fully.
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An auto-fill can help avoid a potential disaster when re-filling your pond. It makes maintaining a pond much easier and with an auto-fill you do not run the risk of forgetting to turn off the water. An auto-fill will automatically keep the pond water at the same level all the time. It is important to note that cheap auto-fills can pose a great threat. Buy a quality auto-fill, not a plastic one.
