These pumps are rotary kind. Gear pumps consist of two distinct parts, one fixed wall and the other rotating part that contains a rotating shaft or a gear. In gear pumps, some fluid trap between the ribs of rotating shaft that is driven out to the external part of the pipe as the rotating shaft rotates. The pumps are constructed in such a way that the distance between the rotor components and fixed wall is very small. They are used to move little amount of medium pressure liquid. The maximum working pressure of the pumps is one hundred and forty to two hundreds times and their volume cannot be adjusted.

Pneumatic systems used in the industry are usually set up with compressed air or inert gases, such as cylinder compressors that work with electric motor, air motors, and other equipments. Pneumatic systems that are automatically or manually controlled through solenoid valves are cheaper, more flexible and more secure alternative to electric motors and operators. A pneumatic system is also used in dentistry, construction, mining, and other sectors. Pneumatic system provides an opportunity to improve the level of industrial capability. Using pneumatic equipment has made tremendous changes in every field.

Hydraulic unit consists of the hydraulic tank, electromotor, pressure control valves, debi, direction and other equipments mounted on it to provide Debi, pressure control and current direction. This collection is also called power pack and power unit. The amount of oil container is determined according to the system requirements pump’s Debi and heat transfer parameters. In this company, the usual volume of the container is thirty to two thousands liters. The size of required electromotor is determined based on the system’s required pressure and Debi. Usual power of single-phase electromotor is up to two point tow kilowatt and three-phase one up to one hundred and sixty kilowatt. Valves, pumps and electromotor are arranged on the oil container according to the system’s designed circuit and mounting limitations.

Hydraulic couplings are divided into two parts: Hydraulic couplings, high pressure hydraulic couplings (more than four hundreds times) used for industry and mobile cases.

Hydraulic engines are operators with the ongoing rotation used to create torque necessary for the rotational load rotation. These operators are divided into orbital, blade and piston groups.