KP1/16G10AKOA4NL1 fuel separator supply pump KRACHT

KP1/16G10AKOA4NL1 fuel separator supply pump KRACHTManual operation of unloading components is commonly used in circuits that require high flow rates for rapid action, high flow rates for rapid action, and reduced flow rates for precise control, such as the boom circuit for rapid expansion and contraction. When the unloading valve of the circuit has no control signal, the circuit keeps outputting a large flow rate. For normally open valves, the circuit will output a small flow rate under normal conditions.

Pressure sensing unloading valve is a common solution. The spring action keeps the unloading valve in its high flow position. When the circuit pressure reaches the preset value of the relief valve, the relief valve opens and the unloading valve switches to its low flow position under the action of hydraulic pressure. The pressure sensing unloading circuit is commonly used for hydraulic cylinders that require fast travel and high pressure and low speed supply at the end of the travel. The pressure sensing unloading valve base is basically an automatic unloading component that unloads when the system pressure is reached, commonly used in range measuring instruments, splitters, and hydraulic vises.

KP1/16G10AKOA4NL1 fuel separator supply pump KRACHTThe unloading valve in the flow sensing unloading circuit is also pressed towards the high flow position by a spring. The fixed orifice size in the valve is determined based on the flow rate required for the optimal engine speed of the equipment. If the engine speed exceeds this optimal range, the pressure drop of the throttle orifice will increase, thereby shifting the unloading valve to the low flow position. Therefore, the adjacent components of the high flow pump are made into sizes that can throttle high flow, resulting in low energy consumption, smooth operation, and low cost in the circuit. The typical application of this circuit is to limit the flow rate of the circuit to the optimal range to improve the performance of the entire system, or to limit the circuit pressure during high-speed machine operation. Commonly used for garbage transport trucks, etc.

The unloading valve of the pressure and flow sensing unloading circuit is also pressed towards the high flow position by the spring, and will unload regardless of reaching the predetermined pressure or flow rate. The equipment can complete high-voltage work at idle or normal operating speed. This feature reduces unnecessary traffic, thus lowering the required power. Because this type of circuit has a wide range of load and speed variations, it is often used in mining equipment.

A pressure sensing unloading circuit with power synthesis, consisting of two sets of slightly varying pressure sensing unloading pumps driven by the same prime mover, each pump receiving a pilot unloading signal from the other unloading pump. This sensing method is called interactive sensing, which allows one set of pumps to operate under high pressure while another set of pumps operates under high flow rate. Two overflow valves can be adjusted according to the specific pressure of each circuit to unload one or two pumps. This scheme reduces power demand, so a small capacity and inexpensive prime mover can be used.

Load sensing unloading circuit. When there is no load sensing signal in the control chamber (lower chamber) of the main control valve, all the flow of the pump is discharged back to the oil tank through valves 1 and 2; When a load sensing signal is applied to this control valve, the pump supplies liquid to the circuit; When the output pressure of the pump exceeds the predetermined pressure value of the load sensing valve, the pump only provides working flow to the circuit, and the excess flow is bypassed back to the oil tank through the throttle position of valve 2.

Compared with plunger pumps, gear oil pumps with load sensing components have the advantages of low cost, strong anti pollution ability, and low maintenance requirements.

Priority traffic control

Regardless of the speed, working pressure, or required flow rate of the gear oil pump, a constant flow control valve can always ensure the flow rate required for equipment operation. In this circuit, the output flow rate of the pump must be greater than or equal to the flow rate required by the primary oil circuit, and the secondary flow rate can be used for other purposes or returned to the oil tank. The fixed value primary flow valve (proportional valve) combines the primary control with the hydraulic pump, eliminating pipelines and eliminating external leaks, thus reducing costs. The typical application of this gear pump circuit is the steering mechanism commonly seen on automotive cranes, which eliminates the need for a pump.