How does a hydraulic pump work

    Hydraulic pumps are power mechanisms designed to create a targeted flow of hydraulic fluid due to the conversion of energy from mechanical (torque, shaft speed) to hydraulic (supply, pressure), and the reverse transformation takes place in hydraulic motors. They have the opposite: hydraulic energy is converted into mechanical.

    How does a hydraulic pump work? The principle of operation, regardless of the type and design of the equipment, is to displace hydraulic lubrication. In this case, the liquid must be displaced with sufficient power necessary to overcome the pressure existing at the point of exit of the device. During operation, the hydraulic pump forces the working fluid to flow from the tank to the unit due to the vacuum on the inlet line. The mechanical action moves the hydraulic fluid between the internal elements of the unit and then flows through the outlet of the unit to the hydraulic system.

Where are hydraulic pumps used

Depending on the type, modification and conditions of use, hydraulic pumps are used in many areas, such as:

• special equipment;
• mechanical engineering;
• the sphere of housing and communal services;
• Agriculture;
• oil and gas industry;
• metallurgy and mining; 
• building;
• wood processing, etc. 

Hydraulic pumps are installed on special equipment, construction machines, lifting mechanisms and other hydraulic machines. In addition to excavators and bulldozers, hydraulic pump graders are used with lifting, pressing equipment. It is also difficult to imagine the work of drilling rigs without them.

ГHydraulic pumps operating on the principle of liquid displacement are called displacement pumps. The design of such a unit provides for special insulated chambers through which liquid moves from the suction zone to the discharge zone. Such devices are adapted to high pressure in the system, but are sensitive to liquids with various impurities.

Types of hydraulic pumps:

The following types of hydraulic pumps are installed on special equipment and industrial equipment, differing in working elements:

1. Radial piston pumps are installed in hydraulic systems with pressure over 40 MPa. They can work under pressure up to 100 MPa. The disadvantages are: pressure pulsation in the system, greater weight of the device compared to axial piston pumps, as well as low speed - the speed usually does not exceed 2000 rpm. For pumps with a liquid supply of 2-3 cm3 / rev, this parameter can reach 3000 rpm.
2. Gear pumps are a type of rotary hydraulic pumps, the working elements of which are 2 gears rotating and displacing liquid. They are used in hydraulic systems with pressures up to 20 MPa (mobile hydraulics, agricultural equipment, lubrication systems, road construction equipment). The advantages of these pumps are relatively simple design, compact dimensions and low weight. The disadvantage is low efficiency (up to 85%), operating pressure and short service life.
3. Axial piston pumps are the most common hydraulic pumps among other types, characterized by excellent power density, efficiency, speed (up to 4000, and in some models up to 20,000 rpm). Some types can operate at pressures up to 70 MPa (700 bar). Disadvantages are high pressure pulsation and equipment cost.

If you want to purchase or repair a hydraulic pump, please contact «ASPECT PLUS».

The latter type of axial piston pumps is very common in Ukraine, since it has a number of advantages over analogues:

• considerable indicators of working and nominal pressure (400-450 bar);
• reliable sealed design of the device chambers;
• maximum values of speed and pressure at light loads;
• robust and reliable construction;
• long service life;
• significant power with a relatively compact size and low weight;
• relatively small moment of inertia due to the small size of the working units;
• there is a possibility of an instant increase / decrease in the speed of rotation;
• permissible normal operation at high system pressures;
• wide range of shaft rotation speeds: 500-4000 rpm.

Among the disadvantages should be noted:

• sensitivity to the quality, purity of hydraulic fluid; 
• relatively high price compared to other types of hydraulic pumps;
• significant pulsations of the liquid when feeding.

Order hydraulic pump, hydraulic motor and spare parts, repair of hydraulic units

Our company is an official dealer of Handok Hydraulic, SKS and Spinparts brands in Ukraine. We offer for sale hydraulic pumps / motors, as well as spare parts for them for equipment: Doosan, Hyundai, Volvo, JCB, HITACHI, CASE, Kobelco, CAT, Komatsu. Our catalog contains hydraulic motors and pumps for construction, road and earthmoving equipment. 

Hydraulic pumps / motors and spare parts for them are available. Seal kits, repair kits, bearings, oil seals, distributors, pressure control valves, flow regulators, plungers, distribution plates, housings, gears. Manufactured by Handok Hydraulic (Korea), SKS (PRC), FDC (UK) and Spinparts. Handok Hydraulic and SKS have been on the market for over 30 years and have a large number of positive reviews both among the craftsmen who repair hydraulics in Ukraine and among the owners of special equipment. 

From us you can profitably purchase hydraulic motors and hydraulic pumps of the following brands:

• - Kawasaki серії DNB50B, K3V, K5V, k7V, M2X, M5X
• - KAYABA - MAG, MSF, PSV2, PSVD;
• - Hitachi - HMGC, HMGF, HPKO, HPV, HPVO;
• - LINDE - HPR, HPV, HMV, HMF, HMR, BPR;
• - Toshiba - SG, MFB, MFC;
• - Bosch Rexroth - A10VO, A10VSO, A11V, A11VO, A11VSO, A11VLO, A4VG, A6VM, A8V, A8VO, A10VG, A7VO;
• - Caterpillar - SBS;
• - Doosan - TSM;
• - JEIL - JMF, JMV;
• - Komatsu - HPV, HMV;
• - Liebherr - LPVD;
• - Nabtesco - GM;
• - Sauer-Danfoss - PV, V, OPV, SPV, PV, M, MF, PV90R, PV90L, PV90M, SPV6/119
• - Uchida - AP2D

Our company repairs axial piston pumps from different manufacturers. We provide guarantees for work, if they are executed by our master.