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Constant-Flow Overflow Pump
The constant-flow overflow pump is an advanced fluid delivery device that integrates constant-flow output with overpressure protection. It ingeniously combines the features of a gear pump and an overflow valve, automatically maintaining a stable flow rate even when input speed or load pressure fluctuates. At the same time, it provides reliable safety protection in case of excessive system pressure, making it a crucial component for achieving precise and dependable fluid control.
Main performance and structural features:
1. Constant Flow: The pump maintains a steady output flow rate, which remains unaffected by changes in input speed or variations in load pressure.
2. Relief: When the system pressure exceeds the preset safety threshold, the pump’s internal relief valve automatically opens, diverting a portion or all of the fluid back to the pump’s inlet side. This action helps limit the system’s maximum pressure, safeguarding the pump, piping, and downstream equipment from damage.
3. Compact Design: Integrating the pump and overflow valve into a single unit simplifies external piping arrangements, enhancing both system reliability and space efficiency.
The primary application of constant-flow overflow pumps is in the hydraulic power steering systems of various vehicles, particularly excelling in tractors:
Tractor Power Steering: During tractor operations, engine speed fluctuates significantly. The constant-flow feature ensures that the steering wheel receives smooth, stable power assistance—whether performing delicate low-speed tasks or quickly moving between fields at high speeds—effectively eliminating issues like heavy steering at low speeds and unstable handling at high speeds. Meanwhile, the overflow function provides crucial safety protection when the wheels are turned to their extreme positions.
Other construction machinery and commercial vehicles—such as forklifts, loaders, heavy-duty trucks, and more—also require stable power steering systems unaffected by engine speed. Constant-flow overflow pumps are likewise standard core components in these machines.
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