Gear pumps are traditionally viewed as constant-flow hydraulic sources due to their fixed displacement design. However, the integration of a threaded coupling valve significantly enhances their functionality, reduces system costs, and improves reliability. This makes gear pump performance comparable to
More expensive and complex piston pumps. For instance, mounting the control valve directly on the pump eliminates the need for external piping, which helps control costs. Fewer fittings and connections also minimize leakage and boost operational reliability. Additionally, integrating the valve into the pump itself can reduce circuit pressure cycles, thus improving overall performance.
Several circuits can enhance the basic functions of gear pumps, some of which are proven viable, while others are innovative. One such circuit is the unloading circuit, which combines a high-flow pump with a low-power single pump. The liquid from both pumps is discharged until a set pressure or flow rate is reached. At this point, the high-flow pump recirculates its output, reducing the system's load and power consumption. The percentage of flow reduction depends on the ratio of the unloaded displacement to the total displacement at that moment. Using a threaded unloading valve minimizes piping, fittings, and potential leaks.
Manual unloading components are often used in applications requiring high flow rates and rapid operation, such as telescopic boom systems. In pressure-sensing unloading circuits, the spring keeps the valve in the high-flow position. When the circuit pressure reaches the relief valve’s preset value, the valve shifts to the low-flow position, reducing energy use and improving system efficiency. These circuits are commonly found in hydraulic jacks and splitters.
Flow-sensing unloading circuits also use a spring-loaded valve that shifts based on flow rate. If the engine speed exceeds the optimal range, the orifice pressure drop increases, causing the valve to switch to low flow. This ensures the system operates efficiently under varying conditions. Such circuits are widely used in garbage trucks and mining equipment.
Load-sensing flow control valves ensure the required flow is always delivered to the system, regardless of pump speed or pressure. They eliminate external piping and reduce leakage, making them ideal for steering mechanisms in truck cranes. Bypass flow control valves maintain a predetermined maximum flow, directing excess fluid back to the tank, which helps manage system performance and reduce costs.
Dry suction valves are pneumatic control devices that regulate oil flow based on hydraulic load. They allow full flow when needed and minimal flow during no-load conditions, eliminating the need for a clutch and reducing noise and power consumption. These valves are commonly used in internal combustion engine-driven hydraulic systems, such as refuse trucks and industrial machinery.
In summary, gear pumps, once limited in function, now offer competitive performance through advanced control schemes. Their cost-effectiveness, simplicity, and adaptability make them a viable alternative to piston pumps in many applications. Choosing the right hydraulic solution depends on factors like system cost, performance requirements, and long-term reliability.
HM Series-Dual Servo Oil-Electric Hybrid
A dual servo oil-electric hybrid is a type of hybrid vehicle that uses both gasoline and electric power to operate. The vehicle has two engines, one gasoline-powered and the other electric-powered. The gasoline engine is used to power the vehicle at high speeds, while the electric engine is used for low-speed driving and when the vehicle is idling.
The dual servo system in the hybrid vehicle is a type of power steering system that uses both hydraulic and electric power to assist the driver in steering the vehicle. The system uses an electric motor to assist the hydraulic power steering pump, which reduces the amount of power needed to turn the steering wheel. This results in improved fuel efficiency and reduced emissions.
Overall, the dual servo oil-electric hybrid system is designed to provide a more efficient and environmentally-friendly way of driving. By using both gasoline and electric power, the vehicle can operate more efficiently and with less impact on the environment.
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