Fixed-pitch propellers are those that feature blades that cannot be adjusted while in use. Others include blades with movable pitches that can be adjusted after the propeller is removed. In contrast, the pitch of the blades on a variable-pitch propeller can be altered while the propeller is in motion. An additional meaning of a "propeller pump" is an impeller-style pump designed for mixed flow applications that has replaceable vanes. The explanation for this was given above.
A stage with an axial flow propeller can have a maximum head of about 15 metres; a stage with a mixed flow impeller can have a maximum head of 20 metres. Flowmore Propeller pumps are the finest for handling large flows and low heads.
This centrifugal pump has a steeper H/Q curve than other versions; at this point, the pump starts to function differently
In order to keep the drive from overloading, propeller pumps are started up against an open discharge-side gate valve. Given that the power input curve reaches its maximum at zero flow, this is required. The typical characteristic curve, which features a "saddle" and a "cut-off point" as well as the power input increasing as the flow rate decreases, suggests that the generally economically impractical bypass modification should be assessed as a control option: One can lower the power input and head while raising the effective flow rate by establishing a bypass line.
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