Function Analysis of Gear Pump instead of Piston Pump

Due to the structure of the displacement limit, it is generally considered gear pump can only be used as a constant flow hydraulic source. However, the attachment-threaded coupling valve scheme is effective in increasing its functionality, reducing system costs and increasing system reliability. As a result, gear pump performance can approach the costly and complex piston pump. For example, the direct installation of the control valve on the pump eliminates the need for piping between the pump and the direction, thus controlling the cost. Less fittings and connectors reduce leakage and improve operational reliability. And the pump itself to install the valve can reduce the cycle pressure of the circuit, improve its performance. Here are some of the loops that can enhance the basic functions of a gear pump, some of which are practically proven viable circuits, while others are innovative. Unloading circuit The unloading element will combine the high flow pump with the low power single pump. Liquid is discharged from the outlets of the two pumps to achieve a predetermined pressure and / or flow rate. At this point, the high-flow pump circulates the flow from its outlet to the inlet, reducing the pump's output flow to the system by reducing the magnetic power slightly above the desired value for high-pressure operation. The percentage of flow reduction depends on the ratio of the unloaded displacement to the total displacement at this time, and the combination or threaded unloading valve reduces or even eliminates the piping, apertures and accessories and other possible leaks. The easiest to uninstall components by hand. The spring causes the unloader valve to be switched on or off, and when the valve is manipulated, the on-off condition of the valve is switched. Lever or other mechanical mechanism is the easiest way to manipulate this valve. The pilot (pneumatic or hydraulic) unloader valve is an improvement on the way in which the valve can be remotely controlled. The biggest progress is the use of electrical or electronic control of the solenoid valve, which can be used not only remote control, and can be automatically controlled by the computer, it is generally considered that this simple uninstall technology is the best case. Manually operated unloading components are commonly used in circuits requiring high flow rates and rapid operation for rapid operation, requiring large flow and reducing flow for precise control, such as a telescopic boom circuit. When the loop shown in Figure 1 is unloaded and there is no signal manipulation (left bit), the loop always outputs a large amount of flow. For normally open valves, the circuit will output a small flow under normal conditions. Pressure sensing unloading is the most common program. As shown in Figure 2, the spring causes the unloader valve to be in its high flow position (left position). When the circuit pressure reaches the preset value of the relief valve, the relief valve opens and the relief valve is switched to its low flow position (right position) under hydraulic pressure and under action. Pressure sensing unloading valve is basically an unloading system to achieve the pressure relief unloading components, commonly used in the splitter and hydraulic vise jaw.