How to improve the basic functions of high pressure gear pump

[Asia Pump Network News] High-pressure gear pump production, the pump installed directly on the control valve, pump and direction can be omitted between the pipeline, high-pressure gear pump and thus control 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 loops that can improve the basic functions of a gear pump. 1, high pressure gear pump unloading circuit unloading components will be in the large flow pump and low power single pump combined. Liquid is discharged from the outlets of the two pumps and the high-pressure gear pump reaches 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 way to unload high-pressure gear pumps is by manual operation. 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. Manually operated, unloaded components are commonly used in circuits that require high flow rates for rapid operation, high flow rates and reduced flow for precise control. High pressure gear pumps, such as fast telescopic boom circuits. Circuit unloading operation without signal (left), the circuit has been a large flow output. For normally open valves, the circuit will output a small flow under normal conditions. Pressure sensing unloading is the most common program. The spring action puts the unloader valve 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. The unloading valve of the pressure-flow sensing unloading circuit is also spring-biased to the high-flow position (left-hand position) and will be unloaded regardless of the desired pressure or flow rate. Equipment in idle or normal working speed can be completed under high-pressure work. This feature reduces unnecessary traffic and therefore reduces the power required. Because of this circuit has a wide range of load and speed changes, it is often used in mining equipment. The unloading valve in the high-pressure gear pump flow sensing unloading circuit is also urged by the spring toward the high flow position (left). The size of the fixed orifice in the valve is based on the required flow rate for the machine's optimum engine speed. If engine speed exceeds this optimum range, the orifice pressure drop will increase, displacing the unloader valve to the low flow position (right position). As a result, adjacent components of the high-flow pump are dimensioned to throttle the maximum flow rate. Therefore, the circuit consumes less energy, operates smoothly and costs less. A typical application of this circuit is to limit the loop flow to the optimum range to improve the overall system performance or to limit the circuit pressure during high speed operation of the machine. Commonly used in garbage truck and so on. It has a power integrated pressure sensing unloader circuit consisting of two slightly modified pressure sensing unloading pumps that are driven by the same prime mover and each magnet receives the pilot unloading signal from the other unloading pump. The way we sense it is interactive sensing, which allows one set of pumps to work at high pressure and the other at a high flow rate. Two relief valves can be adjusted for each circuit's special pressure to unload one or two pumps. This program reduces the power requirements, it can be low-cost prime mover. Compared with the plunger pump, the gear pump with load sensing element has the advantages of low cost, strong anti-pollution ability and low maintenance requirements. 2, high-pressure gear pump priority flow control Regardless of the pump speed, pressure or branch traffic flow needs, set a flow control valve can always ensure the required flow of equipment work. In this circuit, the output flow of the pump must be greater than or equal to the required flow rate of the primary circuit, and the secondary flow rate can be used for it or returned to the tank. Setting a flow valve (proportional valve) will be a combination of control and hydraulic pump, eliminating pipelines and eliminate external leakage, so reduce the cost. A typical application of this gear pump circuit is the steering mechanism often found on truck cranes that eliminates the need for a pump / load sensing flow control valve to function as a primary flow control: that is, regardless of pump speed , Work pressure or branch pumping demand flow size, provide a flow. This circuit replaces the standard primary flow control loop for maximum output flow. Due to no-load circuit pressure is lower than the value of a flow control program, so the loop temperature low, no load power consumption. Load sensing than the flow control valve and a flow control valve, its typical application is power steering. 3, high pressure gear pump bypass flow control For bypass flow control, regardless of the pump speed or working pressure level, the total pump according to a predetermined maximum value to the system for the liquid, the excess part of the row back to the tank or pump inlet. This solution limits the system's traffic and gives it the best performance. This has the advantage of controlling the maximum flow rate through the loop to reduce costs; combining the pump and the valve and bypassing the pump to minimize circuit pressure and reduce the line and leakage from the surface. The bypass flow control valve can be designed with a medium-duty load-sensing control valve that defines the range of working flows (operating speeds). Gear pump circuits of this type are commonly used in refuse truck or power steering pump circuits that limit the hydraulic operation for optimum engine speed and also for stationary machinery. 4, the choice of high-pressure gear pump program At present, the work of the gear pump pressure, function, reduce system costs and increase system reliability has been close to the plunger pump, combined load sensing program provides the possibility of variable gear pumps, which means The original clear boundaries between gear pumps and plunger pumps have become increasingly blurred. Reasonable choice of one of the decisive factors in the hydraulic pump solution is the cost of the entire system. Compared with the expensive piston pump, the gear pump is feasible in many applications due to its low cost, simple circuit and low filtration requirements The choice of program. The above is a detailed analysis of the circuit can improve the basic functions of high pressure gear pump, through these introduction, I believe you have to improve the basic functions of high pressure gear pump have further understanding and understanding. I hope you will be able to better use high-pressure gear pump in the future. Further reading: IFAT China Guangzhou exhibition industry leaders building water pump manufacturers ranking article belongs to Internet industry (Xiamen) Co., Ltd. All are welcome to reprint, please indicate the source and author of: Asian pumps Network Editor: lindj (QQ / WeChat:) Starting: http://beng.liuti.cn/ (Service Hotline:)

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