Filtration systems, commonly referred to as filter carts, are used for the external filtration of hydraulic fluids. These components are helpful for systems that may not need constant filtration, but only require it on occasion. They may also be used prior to the introduction of new hydraulic fluid into a system. The function of these components in the overall fluid power system is no different than their internal counterparts. They clean the hydraulic fluid and keep the system for malfunctioning due to contamination (which leads to wear). As filtration carts are external, they come with the required pieces to connect the fluid power system to the cart. When looking to purchase a filtration system, many companies only provide flow rate and price. But other criteria such as type, operation conditions, and construction should be taken into consideration.
One of the more important criteria that can be considered is the filter type. These filter types are the same as discussed in the hydraulic filter section: Bag, wire mesh, and magnetic. However, when purchasing a filtration system, it is also important to ensure that the replacement filter elements are easy to obtain. It would also be a good idea to check if the filters compatible with your filtration system offer a range of beta ratings, as well as media types. These specifications would allow continued use of the filtration system across a change of process operations, or in a variety of applications.
The next criteria that should be inquired about is the operating conditions of the system, such as the viscosity range. The temperature extremes of the system should also be noted, since the viscosity of a fluid is dependent on its temperature. The flow rate of the system should also be taken into account—these most commonly come in 5, 10 and 15 gpm ratings.
The final area to inquire about is the construction of the system. This includes the size, weight, hose length, hose connection type, and power cord length. Size and weight of the machine may not seem that important, as they often come on carts, but if the filter system can not easily reach the desired location (or at all) then it won’t be of much help. One way around that is to ensure that the hose length is long enough to reach the desired location.
