PARKER gear pump in stock from the United States

PARKER gear pump in stock from the United StatesCompany Introduction:

Our company produces 500 brands in Germany, over 300 brands in Europe, and over 200 brands in the United States. HAWE HAWE, ASCO Asca, Baode BURKERT, FESTO Festo, BOSCH-REXROTH Bosch Rexroth, IFM Yifumen, TURCK Turck, P+F Beijiafu, BALLUFF Barufu, SICK Shik, STEIMEL Shi * pump, HIRSCHMAN Hirschman, MURR Murr, HYDAC Herdeck, GSR, CROUZET Gaonos, E+H Engelshaus, PILZ Pilz, MAHLE Mahler, Hailong HERION, Norgren NORGREN, SCHMERSAL Schmeisser, SIEMENS Siemens, STAUFF Sidford, NEGELE EMG servo valves, UNIVER, ATOS, KACON, VICKERS, MAC, PARKER, MOOG, AB, FAIRCHILD, DENISON, ROSS, UE, MTS, EPRO, MAC, SAMSON, Huntsman, etc. The company also represents the following Japanese brands: CKD Hikari, Kuroda Seiko, SUNX Vision, TOYOOKI Toyoko, NACHI Fujitsu, DAIKIN Daikin, KOGANEI Koganei, TACO,NOK, Tokyo is beautiful. Our company can import customs declaration by ourselves
PARKER gear pump in stock from the United StatesProduct Introduction

Parker gear pump is a rotary pump that relies on the change and movement of the working volume formed between the pump cylinder and the meshing gear to transport liquid or increase its pressure. Two enclosed spaces are composed of two gears, a pump body, and front and rear covers. When the gears rotate, the volume of the space on the disengagement side of the gears increases from small to large, forming a vacuum that sucks in the liquid. The volume of the space on the meshing side of the gears decreases from large to small, and the liquid is squeezed into the pipeline. The suction chamber and the discharge chamber are separated by the meshing line of two gears. The pressure at the discharge port of a Parker gear pump depends on the magnitude of the resistance at the pump outlet.
Parker gear pump is a rotary pump that relies on the change and movement of the working volume formed between the pump cylinder and the meshing gear to transport liquid or increase its pressure. Two enclosed spaces are composed of two gears, a pump body, and front and rear covers. When the gears rotate, the volume of the space on the disengagement side of the gears increases from small to large, forming a vacuum that sucks in the liquid. The volume of the space on the meshing side of the gears decreases from large to small, and the liquid is squeezed into the pipeline. The suction chamber and the discharge chamber are separated by the meshing line of two gears. The pressure at the discharge port of a Parker gear pump depends on the magnitude of the resistance at the pump outlet.
Parker Gear adopts a new technology with a 90 year human level - double arc sine curve tooth profile arc. Compared with involute gears, its outstanding advantage is that there is no relative sliding of the tooth profile during the gear meshing process, so there is no wear on the tooth surface, balanced operation, no trapped liquid phenomenon, low noise, long service life, and high efficiency. This pump breaks free from the constraints of traditional design, allowing gear pumps to enter a new field in design, production, and use.
The Parker gear pump is equipped with a differential pressure safety valve as overload protection, and the full reflux pressure of the safety valve is 1.5 times the rated discharge pressure of the pump. It can also be adjusted according to actual needs within the allowable discharge pressure range. However, this safety valve cannot be used as a pressure reducing valve for long-term operation, and can be installed separately on the pipeline if necessary.
The sealing design of the gear pump shaft end is in two forms, one is mechanical seal and the other is packing seal, which can be determined according to specific usage and user requirements.
Performance improvement methods
Feasible circuit for improving the performance of gear oil pump
Due to the structural limitations of fixed displacement, gear pumps are generally considered to be only suitable for use as constant flow hydraulic sources. However, the combination valve scheme of accessories and threaded connections is effective in improving its functionality, reducing system costs, and enhancing system reliability. Therefore, the performance of gear oil pumps can approach that of expensive and complex plunger pumps.
Installing a control valve directly on the pump can eliminate the pipeline between the pump and the directional valve, thereby controlling costs. Fewer pipe fittings and connectors can reduce leakage and improve work reliability. Moreover, installing valves on the pump itself can reduce the circulating pressure of the circuit and improve its working performance. Here are some circuits that can improve the basic functions of gear pumps, some of which have been proven feasible in practice, while others are innovative research.
Unloading circuit
The unloading components will be combined with high flow pumps and low-power single pumps. Due to the structural limitations of fixed displacement, it is generally believed that gear pumps can only be used as constant flow hydraulic sources for liquid from two gear oil pumps. However, the combination valve scheme of accessories and threaded connections is effective in improving its functionality, reducing system costs, and enhancing system reliability. Therefore, due to the structural limitations of fixed displacement, gear oil pumps are generally considered to be only suitable for use as constant flow hydraulic sources. However, the combination valve scheme of accessories and threaded connections is effective in improving its functionality, reducing system costs, and enhancing system reliability. Therefore, the performance of gear oil pumps can approach that of expensive and complex plunger pumps. The performance can approach that of expensive and complex plunger pumps. Discharge from the outlet until the predetermined pressure and/or flow rate are reached. At this point, the high flow pump circulates the flow from its outlet to its inlet, thereby reducing the pump's output flow to the system, that is, reducing the pump's power to slightly higher than the required value for high-pressure operation. The percentage of flow reduction depends on the ratio of unloaded displacement to total displacement at this time. The combination or threaded connection of unloading valves reduces or even eliminates possible leaks in pipelines, ducts, accessories, and other components.
Simple unloading of components is manually operated. The spring opens or closes the unloading valve, and when a control signal is given to the valve, the on/off state of the valve is easily switched. Leverage or other mechanical mechanisms are a simple way to operate this type of valve.
The pilot (pneumatic or hydraulic) unloading valve is an improvement on the control method, as this type of valve can be remotely controlled. The major advancement is the use of electromagnetic valves controlled by electrical or electronic switches, which can not only be remotely controlled but also automatically controlled by microcomputers. This simple unloading technology is generally considered to be an application scenario.
Manual 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. As shown in Figure 2, 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.
The 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 according to the flow rate required by the engine speed of the equipment. If the engine speed exceeds this 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 range of the circuit 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.
For a pressure sensing unloading circuit with power synthesis, it consists of two sets of slightly varying pressure sensing unloading pumps, which are driven by the same prime mover. Each pump receives 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.
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.
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 the circuit shown in Figure 7, 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.
The function of load sensing flow control valve is very similar to that of fixed value primary flow control: it provides primary flow regardless of the pump speed, working pressure, or the required flow rate of the branch. But only provide the required flow to one oil circuit through one oil port until its large adjustment value. This circuit can replace the standard primary flow control circuit to achieve high output flow. Due to the pressure of the no-load circuit being lower than the set value in the flow control scheme, the temperature rise of the circuit is low and the no-load power consumption is small. The load sensing proportional flow control valve, like the primary flow control valve, is typically used in power steering mechanisms.
For bypass flow control, regardless of the pump speed or working pressure, the pump always supplies liquid to the system at a predetermined maximum value, and the excess is discharged back to the oil tank or pump inlet. This scheme restricts the traffic entering the system to make it more efficient. Its advantage is that it can control the large adjustment flow and reduce costs through the loop scale; Combine the pump and valve into one unit, and control the bypass of the pump to lower the circuit pressure, thereby reducing pipeline and its leakage. The bypass flow control valve can be designed together with a medium cluster load sensing control valve that limits the range of working flow (working speed). This type of gear pump circuit is commonly used in garbage trucks or power steering pump circuits that limit hydraulic control to achieve engine speed, and can also be used in fixed mechanical equipment.
Dry oil suction valve is a type of pneumatic hydraulic valve used for pump inlet throttling. When the hydraulic system of the equipment is unloaded, only a very small flow rate (<18.9t/min) is allowed to pass through the pump; And when there is a load, the full flow suction pump. As shown in Figure 10, this circuit can eliminate the clutch between the pump and the prime mover, thereby reducing costs and minimizing no-load power consumption, as the minimal flow through the circuit maintains the prime mover power of the equipment. In addition, it also reduces the noise of the pump when it is unloaded. The dry oil suction valve circuit can be used in switch hydraulic systems in any vehicle driven by an internal combustion engine, such as garbage trucks and industrial equipment.
Selection of hydraulic pump scheme
The working pressure of the gear oil pump has approached that of the plunger pump, and the combined load sensing scheme provides variable possibilities for the gear pump. This means that the previously clear boundary between the gear pump and the plunger pump is becoming increasingly blurred.
One of the determining factors for choosing a reasonable hydraulic pump solution is the cost of the entire system. Compared with expensive plunger pumps, gear pumps have become a practical and feasible choice for many applications due to their lower cost, simpler circuit, and lower filtration requirements.
The output power of Parker gear pump is significantly lower than the input power. All of its losses are converted into heat energy, which can cause the oil pump to overheat. If the joint plane is pressed tightly, the floating shaft sleeve may experience slight movement during operation, causing wear and tear, resulting in slow or impossible lifting of the agricultural tool. Such floating shaft sleeves must be replaced or repaired. It mainly consists of gears, shafts, pump bodies, pump covers, bearing sleeves, shaft end seals, etc. The gear is manufactured with a double arc sine curve tooth profile. The outstanding advantage of Parker gear pump compared to involute gears is that there is no relative sliding of the tooth profile during the gear meshing process, so the tooth surface is not worn, the operation is smooth, there is no liquid phenomenon, low noise, long service life, and high efficiency. This pump breaks free from the constraints of traditional design, entering a new field in the design, production, and use of gear oil pumps.