Flow divider designs

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Flow-divider application Synchronised running Pressure multipliers If several motors or cylinders are operate from a single pump without any means of controlling their individual flows only the motor or cylinder with the lowest pressure requirement would start its work cycle. The motor or cylinder with the next lowest pressure requirement would only start when the first unit has completed its work cycle. This mode of operation is generally undesirable and it is therefore necessary for the total pump flow to be divided into a series of partia flows.This can be achieved in the following ways: As mentioned...

Required Input Pressure output pressure pressure drop Synchronisation differences With particular reference to the gear-motor flow dividers EKO.MTO but also for the radial-motor flow dividers EKO.MT-GM and EKO.MTL synchronisation differences depend on the following parameters: • Oil viscosity and temperature • Pressure load varability • System pressure levels • Total flow rate to be divided Precise indications of synchronisation levels are only possible if the details of all the above parameters are known. A general indication may be obtained from the following values: EKO.MK under...

Flow-divider application Using a “driver” This is achieved by adding an extra section of equal or greater displacement to the flow divider.The return line of this section is connected directly to tank so that it in effect works as a motor for the other sections in the flow divider thereby increasing their outlet pressures. This is useful, for example, in lifting platforms that should lower under action of their own weight, but where the weight of the empty platform is insufficient for this to occur. Compensating synchronisation errors - installation of the flow divider in the hydraulic circuit As...

Flow-divider application Hydraulic fluids Application limits Our flow dividers are designed to be used with mineral oil in accordance with DIN 51524. The operating temperature range is fixed at -25°C to +80°C with normal seals and -25°C to +100°C when using Viton seals. Due to the propensity of all flow dividers to leak oil it is not possible to keep the cylinders under pressure for an extended period of time. As a consequence it is necessary to fit pilot-operated non-return valves in every line between flow divider and cylinder. The recommended oil viscosity is between 12 and 100 cSt, while at start-up...

The pressure control valves are set to these values The fact that the pressure valves are counter-sunk means that it is not possible to adjust them,whilst at the same time looking at the pressure manometer.In order to set the valves it is necessary to remove the pressure cartridge from the block. Since the safety valves need not be set to a great degree of precision and can easily accommodate a tolerance of 3 bar, it is possible to set the valve by simply measuring the distance 'L' using a calliper rule. In the diagrams (left) you can read off the values for pressure = f(L) for the different...

Flow-divider application EKO.MTO Sizes 1 and 2 Aluminium housing. The different displacements of units within the same size are indicated by the width of the housing. It is possible to interconnect flow dividers of any displacement listed in the tables. The same is also possible in terms of combining both component groups. This is important when they are used as pressure boosters. The inlets to the individual chambers are interconnected internally. The number of connections on the inlet side must be based on the flow to be divided. In version‘A’each section has a combined pressure relief and suction...

Integral pressure valves in the MTO General points Flow dividers must be fitted as close to the cylinders as possible and the pipe connections to the individual chambers must be of equal length, as far as this is possible. Hydraulic fluids, viscosities Oil flow dividers are designed for use of mineral oil in accordance with DIN 51524. The recommended oil viscosity is between 12 and 100 cSt, while at start-up they are approved for maximum values up to 600 cSt. chambers of the divider. Leakage oil pressure maximum of 10 bar, or a maximum of 1.5 bar for versions with protruding measurement shaft. Commissioning...

The valve produces 2 flows or riunifies 2 flows. The total flow should lie between the minimum and maximum limits below. Within the flow-limits, the flow are nearly independant of oil-pressure and viscosity. Using this valve it's important to know that a stop of the first flow causes a throttling of the second-one. This produces heat. Please take care of this fact. Generally we recommead the alloy-version, last not least due to the lower costs. Only a pressure of over 210 bar leads to the steel-version. 24 max. total flow (l/min) EKO.MKA Flow-divider valve in alloy EKO.MKS Flow-divider...

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Displacement min. flow max. flow Continue per section per section per section pressure Peak pressure (bar) max. pressure difference between the sections outputs (bar) Providing that the flow-noise is not an issue, it is possible to increase the pressure values in the chambers. Example: EKO.MTO-4-5-AVR 4-section flow-divider with all section of 5,5 cm3/rev, pressure valve adjustable AVR Pressure control valves adjustable from 130 to 280 bar, standard Spring colour red, preset to approx. 180 bar AVG Pressure control valves adjustable from 90 to 200 bar, Spring colour green,...

The drawing shows a 4-section flow-divider. Using more or less sections, you have to calculate the total length with a difference of B each section.