Hydraulic filter: overview, description, types, sizes and reviews

Hydraulic filter is a device that is designed to clean the working fluid from metal chips, dust, small contaminants, elements of chemical decomposition of oil, as well as fibers.

Scope of use

These consumables have found wide distribution in production, in the field of road and public construction, as well as in other areas. The installation of the filter guarantees the safety of the working components of the valves, pumps, servo motors, etc. This includes hydraulic drive systems for mobile machinery and machines operating under conditions of high friction and pressure. In this case, the elements can always come into contact with the working fluid.

Description

The hydraulic filter consists of a glass or a housing, a filter element, a fill indicator, and a bypass valve. The first of these elements is made of stainless steel, aluminum, less often of plastic. If the case is worn, it can be disassembled and replaced. The choice of housing material depends on the conditions and operating temperature.

As for the filter element, it can be multi- or one-time. In the first case, the consumables can be regenerated. Glass fiber or paper is used as a basis, if it is a single-use filter element. Reusable products are made using stainless fiber, as well as metal mesh. Once the regenerating filter is filled, the net can be cleaned by blowing compressed air. Sometimes it is soaked in special solutions. Such a hydraulic filter can last about 10 years. In order for the user to determine that the filter is filled with contaminating particles, it is provided with a fill indicator, which can be represented visually-electric, electric or visual type.

The latest version has built-in LEDs. If the filter is an electrical indicator, it sends a signal to the control device. It can be a switch-off and switch-on relay. In some cases, the signal is sent to the computer that is controlled by the operator. The most simple are the visual-electrical indicators that give a signal to the control system or LED. As another element of the hydraulic filter is a bypass valve. It is designed to allow oil to flow at the onset of peak pressure, which is 2.5 bar. Such a valve is not installed on all filter elements. If the device is not equipped with a bypass system, then at the time of filling the filter it may burst, and mechanical particles enter the system.

Types of hydraulic filters depending on the installation site

The hydraulic filter, depending on the location, is arranged in different ways. It can be suction, pressure or drain. The first option is installed directly in front of the pumping equipment and is responsible for the selection of coarse particles. Suction filters require the need for a careful selection of the size, only this way you can exclude cavitation, which is the occurrence of air bubbles in the oil.

Pressure filters are installed after the pumping equipment, characterized by a strong filtration of the liquid. For the fine cleaning of the oil, which passed the entire hydraulic process, a hydraulic oil drainage filter is used. There are such elements before draining the oil in the tank. A distinctive feature, which is a plus, is the ideal cleaning of oil from fine-grained contaminants.

Reviews of hydraulic filters of the brand Fleetguard

If you need a hydraulic filter , you can prefer the product of the manufacturer. As users emphasize, it has excellent quality and environmental safety. Some filtering devices of this company are supplied with special Stratapore material, which surpasses paper analogues. As practice shows, the paper base retains the cleaning properties for a short time, then the filtration efficiency decreases, the device becomes unusable.

As for the special material Stratapore, it is created from five layers. The first one is cellulose, whereas the next three are polyester. And one more layer is protection from wear-resistant materials. This technology is used for the manufacture of hydraulic oil filters.

The hydraulic pressure filter, according to customers, surpasses the characteristics of fuel analogs. Among the advantages can be distinguished ability to work at a high working pressure, which can reach 450 bar. The buyer claims that such a device has a maximum liquid capacity exceeding 500 liters per minute. Engineers design such replaceable elements, taking into account the occurrence of a possible pressure drop in the system.

Overview of popular hydraulic filters

On sale today you can find replacement hydraulic elements of the brand Donaldson, the lattice material of which consists of a metal net with dense weaving. Replaceable elements have a low cleaning efficiency, since they are able to cope only with large-fraction elements. As their advantage is the possibility of re-operation after cleaning.

Bulk hydraulic filters are based on a material that consists of a non-woven fabric. This layer is able to absorb moisture, losing the ability to filter. The surface version of the hydraulic filters of this company is made of non-woven or paper cloth with a mesh steel mesh. These filters have the highest filtering ability and mechanical strength.

Overview of the characteristics of hydraulic filters brand "Parker"

These consumables have found wide application everywhere due to the high quality of filtration and reliability. They are used in engineering, metallurgy and in the operation of hydroelectric power stations. On sale you can find low and medium pressure filters, dual, as well as duplex, designed for pipe mounting.

Filter sizes

For effective work it is important to choose a filter by size. Thus, Fleetguard HF6317 you can buy for 1900 rubles. Its height is 210.5 millimeters. The model Fleetguard HF6569 has a height of less than 240 millimeters. Pay for this device will have 3000 rubles. Filter element Fleetguard HF6141 has a height equal to 210.5 millimeters, and its price is 1300 rubles. Dimensions of hydraulic filters are also selected depending on the size of the thread. In the first case this parameter is equal to M24 X 1.5-6H EXT, in the second variant the thread size is 1 3 / 8-12 UNF-2B, whereas the third of the mentioned filters has the following thread size: 1-12 UNF-2B.

Conclusion

When choosing a hydraulic filter, it should be taken into account that with a decrease in temperature, the viscosity of the cold oil can increase. This increases the hydraulic resistance of the filter, therefore, the engine experiences an oil starvation. In order to exclude its rapid failure, it is necessary to correctly assess the fineness of the filtration.