Slack & Parr Hydraulics Rotary Geared Flow Dividers
Genuine UK-Manufactured FDRX & FDL Series Flow Dividers
Complete Selector Guide, Technical Specifications & Sizing Support for Hydraulic Synchronization Systems in Indonesia.
Trusted Rotary Flow Divider Manufacturer Since 1917
Slack & Parr Hydraulics designs and manufactures a standard range of high-accuracy rotary flow dividers, featuring ground gears and lapped finishes for precise flow division and reliable high-pressure operation. Rotary flow dividers split the input flow from a single hydraulic supply into two or more outputs of equal or unequal flow, and are widely used for synchronization of rams (level lifting) or to operate two or more hydraulic actuators at different speeds, each protected with an integral relief valve. All units are fully reversible, so only one divider is required to synchronize actuators in both directions of movement.
Special applications, such as stainless steel flow dividers for corrosive environments, can also be manufactured, including small quantities and custom designs.
Slack & Parr Hydraulics Product Range
Flow Divider FDRX Series
Compact rotary geared flow divider. Element capacity 2–9 cc/rev, 2–6 elements, input flow 3–162 LPM, maximum pressure 350 bar. Ideal for light & medium duty synchronization applications.
Flow Divider FDL Series
Large-capacity rotary geared flow divider. Element capacity 12–30 cc/rev, 2–6 elements, input flow 18–540 LPM, maximum pressure 345 bar. Built for heavy-duty industrial & mobile hydraulic equipment.
Stainless Steel Flow Divider FDR
Rotary geared flow divider manufactured in stainless steel for highly corrosive environments. Custom designs and small production quantities available on request.
Flow Divider Selector Guide & Specifications
Use the tables below to select the correct order code based on the number of outlet elements and required input flow at minimum (750 rpm), standard (1500 rpm) and maximum (3000 rpm) speed.
FDRX Series – Rotary Geared Flow Divider Selector Guide
| Order Code | No. of Elements/Outlets | Element Capacity (cc/rev) | Min Flow @750rpm (LPM) | Std Flow @1500rpm (LPM) | Max Flow @3000rpm (LPM) |
|---|---|---|---|---|---|
| FDRX2/2 | 2 | 2 | 3 | 6 | 12 |
| FDRX2/4 | 2 | 4 | 6 | 12 | 24 |
| FDRX2/6 | 2 | 6 | 9 | 18 | 36 |
| FDRX2/9 | 2 | 9 | 13.5 | 27 | 54 |
| FDRX3/2 | 3 | 2 | 4.5 | 9 | 18 |
| FDRX3/4 | 3 | 4 | 9 | 18 | 36 |
| FDRX3/6 | 3 | 6 | 13.5 | 27 | 54 |
| FDRX3/9 | 3 | 9 | 20.2 | 40.5 | 81 |
| FDRX4/2 | 4 | 2 | 6 | 12 | 24 |
| FDRX4/4 | 4 | 4 | 12 | 24 | 48 |
| FDRX4/6 | 4 | 6 | 18 | 36 | 72 |
| FDRX4/9 | 4 | 9 | 27 | 54 | 108 |
| FDRX5/2 | 5 | 2 | 7.5 | 15 | 30 |
| FDRX5/4 | 5 | 4 | 15 | 30 | 60 |
| FDRX5/6 | 5 | 6 | 22.5 | 45 | 90 |
| FDRX5/9 | 5 | 9 | 33.7 | 67.5 | 135 |
| FDRX6/2 | 6 | 2 | 9 | 18 | 36 |
| FDRX6/4 | 6 | 4 | 18 | 36 | 72 |
| FDRX6/6 | 6 | 6 | 27 | 54 | 108 |
| FDRX6/9 | 6 | 9 | 40.5 | 81 | 162 |
Modular construction. Max input 27 LPM per section. Speed range 750–3000 rpm. Maximum pressure 350 bar.
FDL Series – Rotary Geared Flow Divider Selector Guide
| Order Code | No. of Elements/Outlets | Element Capacity (cc/rev) | Min Flow @750rpm (LPM) | Std Flow @1500rpm (LPM) | Max Flow @3000rpm (LPM) |
|---|---|---|---|---|---|
| FDL 2/12 | 2 | 12 | 18 | 36 | 72 |
| FDL 2/18 | 2 | 18 | 27 | 54 | 108 |
| FDL 2/24 | 2 | 24 | 36 | 72 | 144 |
| FDL 2/30 | 2 | 30 | 45 | 90 | 180 |
| FDL 3/12 | 3 | 12 | 27 | 54 | 108 |
| FDL 3/18 | 3 | 18 | 40.5 | 81 | 162 |
| FDL 3/24 | 3 | 24 | 54 | 108 | 216 |
| FDL 3/30 | 3 | 30 | 67.5 | 135 | 270 |
| FDL 4/12 | 4 | 12 | 36 | 72 | 144 |
| FDL 4/18 | 4 | 18 | 54 | 108 | 216 |
| FDL 4/24 | 4 | 24 | 72 | 144 | 288 |
| FDL 4/30 | 4 | 30 | 90 | 180 | 360 |
| FDL 5/12 | 5 | 12 | 45 | 90 | 180 |
| FDL 5/18 | 5 | 18 | 67.5 | 135 | 270 |
| FDL 5/24 | 5 | 24 | 90 | 180 | 360 |
| FDL 5/30 | 5 | 30 | 112.5 | 225 | 450 |
| FDL 6/12 | 6 | 12 | 54 | 108 | 216 |
| FDL 6/18 | 6 | 18 | 81 | 162 | 324 |
| FDL 6/24 | 6 | 24 | 108 | 216 | 432 |
| FDL 6/30 | 6 | 30 | 135 | 270 | 540 |
Modular construction. Max input 90 LPM per section. Speed range 750–3000 rpm. Maximum pressure 345 bar.
How to Select a Flow Divider for Hydraulics?
Equal Flow Dividers
Having decided on the separate flow ratio, the sum of which gives total input flow, select a divider that will pass these flow rates at or near 1500 rpm. If flow is variable, calculate the rotation speed at both maximum and minimum input and ensure it falls within the 750–3000 rpm range.
Unequal Flow Dividers
Select the desired flows at or near 1500 rpm, keeping in mind that all elements in a flow divider rotate at the same speed. Calculate the speed of one element from its flow rate, then select the remaining elements to provide their required flows at that same speed. In practice, any combination of outputs can be provided within each series’ rated capacity per section.
Calculation of Inlet Pressure
PQ = P1Q1 + P2Q2 + P3Q3 + PR, where P = inlet pressure, Q = inlet flow, P1/P2/P3 = outlet pressures, Q1/Q2/Q3 = outlet flows, and PR is the pressure required to rotate the flow divider (typically assumed at 17 bar / 247 psi for standard ISO VG 32 hydraulic fluid at 40°C).
Using a Flow Divider as a Pressure Intensifier
An equal-element unit with two sections can achieve approximately 2x the inlet pressure at one outlet if the second outlet is piped to tank. Unequal units can achieve higher intensification ratios. Intensified outlet pressure: Po = Pi × (E1+E2+E3…) / E1, where E1 is the element capacity of the high-pressure element and E2, E3… are the low-pressure (bypass) elements.
Typical Applications
Ram Synchronization & Level Lifting
Ensures multiple hydraulic rams move in unison for level lifting platforms, gantries and mobile equipment.
Multi-Actuator Speed Control
Operates two or more hydraulic actuators simultaneously at different, precisely proportioned speeds.
Pressure Intensification
Dump one or more outlets to tank to intensify pressure at a remaining outlet for specialized processes.
Bidirectional Operation
All units are fully reversible, so a single divider synchronizes actuators in both directions of travel.
Frequently Asked Questions
What is a rotary geared flow divider used for?
What is the difference between the FDRX and FDL series?
What is the maximum operating pressure?
Can flow dividers be customized, e.g. in stainless steel?
How do I choose the right order code?
Need Help Selecting the Right Flow Divider?
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