Parker Hannifin has expanded its range of twin flow hydraulic pumps, introducing new sizes to a series that has been designed to reduce fuel consumption in commercial and utility vehicles with multiple hydraulic systems; depending on the application, this can be as much as five litres per operating hour. Called the F2 Series, the new pumps are ideal for use in refuse collection, forestry, gritting, recovery and construction vehicles, where hydraulics are used to control a wide range of ancillary equipment. In addition, for applications where a single flow pump is required, Parker offers its F1 Series of high efficiency, low noise pumps.
Traditionally, hydraulic systems used to power multiple on-vehicle devices, such as PTO, lifting, handling or loading equipment, are operated from a single hydraulic pump, with a flow divider or restrictor and an arrangement of additional components to ensure that the correct flow and pressure are maintained for each operating device. This frequently results in the overall system being oversized in order to meet peak load requirements; in turn, however, this increases heat losses and component wear, leading to higher fuel consumption and operating costs. One previous method of overcoming this is to use a combination of load sensing devices, combined with a variable displacement pump, but this is often time consuming and expensive.
By comparison, the new F2 Series of twin flow pumps can be used to control each on-vehicle system independently, providing a precise and consistent flow of hydraulic oil at all times, including peak load, even when an open centre arrangement is used. In a typical configuration, the use of an F2 pump simplifies the construction of ancillary hydraulic circuits, eliminating the need for components such as oil coolers, reservoirs and flow limiters and reducing the number of hoses and connectors required.
In addition, the ability to simplify system design minimises assembly and maintenance costs and helps to extend operating life. Just as importantly, by using an F2 pump it is possible to reduce power losses significantly. For example, an application typically using a single flow pump, such as a gritting vehicle, could potentially suffer from losses of up to 20kW; by installing an F2 pump these can be significantly reduced to less than one kW, resulting in a potential fuel saving of up to 5 litres of diesel per hour based on average fuel consumption figures.
Parker’s F1 single flow pump is also ideal for mobile applications as it is able to tolerate low and high temperature fluctuations. The F1 pump also features positive synchronisation with timing gear and laminated piston rings to minimise leakage. In addition the compact F1 is eco friendly and simple to install, requiring minimum piping and thus reducing installation costs.
Available in a variety of specifications with frame sizes ranging from 25 to 101, all weighing as little as 8.5kgs, all sizes of the F1 pump range have a maximum operating pressure of 400 bar for intermittent use, or 350 bar in applications where permanent use is required, and are capable of providing shaft speeds of 1900rpm to 2700rpm and corresponding theoretical torques of between 142 Nm and 378 Nm, depending on the frame size and operating pressure used in the specific application.
The new F2 twin flow pumps are compact and highly efficient and are available in four sizes to suit most applications. In addition, for applications where a single flow pump is required, Parker offers its F1 Series of high efficiency, low noise pumps. In each case, a full range of technical support services are available through the company’s global support network.