The hydraulic filter is a device that is designed to clean the working fluid from metal chips, dust, small contaminants, elements of the chemical decomposition of oil, as well as fibers.
Use area
These consumables are widely used in production, in the field of road and communal construction, as well as in other areas. Installing a filter guarantees the safety of the working components of valves, pumps, servomotors, etc. This includes hydraulic drive systems for mobile equipment and machines operating under conditions of high friction and pressure. In this case, the elements can constantly come into contact with the working fluid.
Description
A hydraulic filter consists of a cup or housing, a filter element, a full indicator, and a bypass valve. The first of these elementsmade of stainless steel, aluminum, less often plastic. If the case is worn out, it can be disassembled and replaced. The choice of housing material depends on the operating conditions and operating temperature.
As for the filter element, it can be multiple or disposable. In the first case, consumable components can be subjected to regeneration. The basis is fiberglass or paper, if we are talking about a disposable filter element. Reusable are made using stainless fiber, as well as metal mesh. Once the regeneration filter is full, the mesh can be cleaned by blowing with compressed air. Sometimes soaking in special solutions is performed. Such a hydraulic filter can last about 10 years. In order for the user to be able to determine that the filter is full of contaminants, it is provided with a full indicator, which can be represented by a visual-electrical, electrical or visual type.
The last variety has built-in LEDs. If there is an electrical indicator in the filter, it sends a signal to the control device. It could be an on/off relay. In some cases, a signal is sent to a computer controlled by an operator. The simplest are visual-electrical indicators that give a signal to control systems or an LED. The bypass valve acts as another element of the hydraulic filter. It is designed to let oil through 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 when the filter is filled, it may burst, and mechanical particles enter the system.
Varieties of hydraulic filters depending on installation location
The hydraulic filter, depending on the location, is arranged differently. 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 careful sizing to avoid cavitation, which is the formation of air bubbles in the oil.
Pressure filters are installed after pumping equipment, characterized by strong liquid filtration. For fine purification of oil, which has passed the entire hydraulic process, a hydraulic oil drain filter is used. Such elements are located before draining the oil into the tank. A distinctive feature, which is a plus, is the ideal cleaning of oil from fine-grained contaminants.
Fleetguard hydraulic filter reviews
If you need a hydraulic system filter, you can prefer the product of the mentioned manufacturer. As users emphasize, it is of excellent quality and environmental safety. Some filter devices of this companyare supplied with a special material Stratapore, which is superior to paper counterparts. As practice shows, the paper base retains its 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 is cellulose, while the next three are polyester. And one more layer is protection from wear-resistant materials. This technology is used to make hydraulic oil filters.
A hydraulic pressure filter, according to buyers, is superior in performance to fuel counterparts. Among the advantages, one can single out the ability to work at high working pressure, which can reach 450 bar. The buyer claims that such a device has a maximum liquid throughput in excess of 500 liters per minute. Engineers design these replacement elements to accommodate the possible pressure drop in the system.
Overview of popular hydraulic filters
On sale today you can find replaceable hydraulic elements of the Donaldson brand, the lattice material of which consists of a metal mesh with a dense weave. Replaceable elements have a low cleaning efficiency, as they are able to cope only with coarse-grained elements. Their advantage is the possibility of reuse after cleaning.
Volume hydraulic filters are based onmaterial that consists of non-woven fabric. Such a layer is able to absorb moisture, losing its ability to filter. The surface variety of this company's hydraulic filters are made of non-woven or paper cloth with meshed steel mesh. These filters are characterized by the highest filtration capacity and mechanical strength.
Parker Hydraulic Filter Features Overview
These consumables are widely used throughout the world due to their high filtration quality and reliability. They are used in mechanical engineering, metallurgy and in the operation of hydroelectric power plants. On sale you can find filters of low and medium pressure, dual, as well as duplex, designed for pipe installation.
Filter sizes
For efficient operation, it is important to choose the right filter size. Thus, you can purchase Fleetguard HF6317 for 1900 rubles. Its height is 210.5 millimeters. The Fleetguard HF6569 model has a smaller height of 240 millimeters. You will have to pay 3,000 rubles for such a device. The Fleetguard HF6141 filter element has a height of 210.5 millimeters, and its price is 1300 rubles. The dimensions of hydraulic filters are also selected depending on the size of the thread. In the first case, this parameter is M24 X 1.5-6H EXT, in the second case, the thread size is 1 3/8-12 UNF-2B, while the third of the mentioned filters has the following thread size: 1-12 UNF-2B.
Conclusion
When choosing a hydraulic filter, keep in mind that when the temperature drops, the viscosity of cold oil may increase. This increases the hydraulic resistance of the filter, therefore, the engine experiences oil starvation. In order to exclude its rapid failure, it is necessary to correctly assess the fineness of the filtration.
