Gear Pump Performance Improvement Method

Priority Flow Control

Regardless of the speed of the gear oil pump, working pressure or the flow required by the branch, the fixed primary flow control valve can always ensure the flow required by the equipment. In this loop, the output flow of the pump must be greater than or equal to the flow required by the primary oil circuit, and the secondary flow can be used for other purposes or back to the tank. The fixed primary flow valve (proportional valve) combines the primary control with the hydraulic pump, eliminates the pipeline and eliminates the external leakage, thus reducing the cost. Gear pump belongs to hydraulic parts, the typical application of this gear pump circuit is often seen on the truck crane steering mechanism, it eliminates a pump.

Bypass Flow Control

For bypass flow control, regardless of pump speed or working pressure, the pump always supplies liquid to the system at a predetermined maximum. Excess is discharged back to the tank or pump inlet. This scheme limits the amount of traffic entering the system for optimal performance. Its advantage is that the maximum adjusted flow rate can be controlled through the loop size and the cost can be reduced. The pump and valve are combined into one, and through the pump bypass control, so that the loop pressure is reduced to a minimum, thereby reducing the pipeline and its leakage.

Bypass flow control valves can be designed in conjunction with mid-cluster load sensing control valves that limit the working flow (working speed) range. This type of gear pump circuit is commonly used in garbage trucks or power steering pump circuits that restrict hydraulic control to maximize engine speed. It can also be used in stationary machinery.

Dry Suction Valve

Dry type oil suction valve is a kind of air control hydraulic valve, it is used for pumping oil throttling, when the equipment's hydraulic load, only the minimum flow (< 18.9t/min) through the pump; And when there is a load, full flow suction pump. This loop eliminates the need for a clutch between the pump and the prime mover, thus reducing costs and reducing no-load power consumption because the minimal flow through the loop maintains the prime mover power of the device. In addition, it also reduces the noise of the pump when it is not loaded. The dry suction valve circuit can be used in any on-off hydraulic system in any vehicle driven by an internal combustion engine, such as garbage loading trucks and industrial equipment.

The Choice of Hydraulic Pump Scheme

The working pressure of the gear pump is close to that of the plunger pump, and the combination of load sensing solutions provides variable possibilities for the gear pump, which means that the clear boundary between the gear pump and the plunger pump becomes increasingly blurred.

One of the determining factors of the reasonable choice of hydraulic pump scheme is the cost of the whole system. Compared with the plunger pump of high price, the gear pump has become a feasible choice scheme for many applications because of its low cost, simple loop and low filtration requirements.